Glass composition, glass article and method of making it

Abstract

This disclosure relates to glass and glass articles. These glass articles include flat glass suitable for display devices (such as electronic devices, including smartphones, smartwatches, and tablets). A method for manufacturing glass articles is also described.

Description

Glass components, glass objects and their manufacturing methods This disclosure relates to glass and glass articles. These glass articles include flat glass suitable for display devices (such as electronic devices, including smartphones, smartwatches, and tablets). A method for manufacturing glass articles is also described. Foldable displays (such as smartphones and tablets) are becoming increasingly popular. Foldable devices combine the advantages of a large screen when unfolded with a portable size when folded. For the glass sheet to be used in such a foldable display, it must be extremely thin. Very thin glass is easily broken. Furthermore, the glass must be strong enough to withstand repeated folding and unfolding operations. Aluminosilicate glass is commonly used in portable electronic devices. It possesses certain properties that make it ideal for use as display glass. These properties include its ability to be produced in very small thicknesses. For display shield glass to be flexible or foldable, its thickness must be quite small, for example, less than 100 μm, or even as low as 30 μm. Impact resistance decreases as thickness decreases. Therefore, measures must be taken to strengthen the glass. Some prior art glasses can be strengthened, but their chemical resistance is insufficient. Having glass that can overcome the shortcomings of previous technologies will be advantageous. In the first state sample, this disclosure relates to a glass comprising i. SiO 2, ii. Total Al content of 5.0 to 25.0% by weight 2O 3 and / or B 2O 3, ii. At least 3.0% by weight of ZrO 2 and / or Y 2O 3, iii. One or more oxides selected from the following, in total amounts ranging from 10.0 to 40.0% by weight: ZnO, Li 2O, Na 2O, K 2O, MgO, CaO, SrO, BaO, and combinations thereof, and iv. Selected from P as appropriate. 2O 5 and TiO 2. One or more components. In the second state, this disclosure relates to a glass comprising the following components (by weight percentage). Where R The sum of the amounts of alkali metal oxides in the 2O series and the sum of the amounts of all alkaline earth metal oxides in the R'O series. The inventors have discovered that the glass according to the first and second states provides a novel combination of desired properties. This glass exhibits significant susceptibility to chemical strengthening. This means that when immersed in a salt bath for chemical strengthening, the glass will develop high compressive stress on its surface in a very short time. In one specific example, this compressive stress susceptibility will be at most 800 MPa or even 1000 MPa within 30 minutes of chemical strengthening. Despite this significant susceptibility to compressive stress, the glass has only moderate thermal expansion, such as a coefficient of thermal expansion below 8.8 ppm / K or even below 8.0 ppm / K. This very moderate thermal expansion allows for the production of objects with excellent dimensional properties. During the production of thin glass, for example in the down-draw process, the glass undergoes rapid cooling. Typically, the cooling rate is not exactly the same for all parts of the glass. This will result in warping of the glass object. Objects made from glass with a higher coefficient of thermal expansion will warp more. Because the glass disclosed herein has a low coefficient of thermal expansion, glass objects with particularly low warping can be produced. Furthermore, the glass disclosed herein also exhibits excellent chemical resistance. Chemical resistance is extremely useful in glasses used for display applications. Prior art glasses with significant chemical strengthening properties typically have moderate or insufficient chemical resistance. In the third state, this disclosure relates to glass objects comprising or composed of the glass described herein. In the fourth state, this disclosure relates to glass articles comprising or composed of the glass described herein, and comprising ion exchange layers on one or both of their main surfaces. In the fifth aspect, this disclosure relates to electronic devices that include the glass or glass objects described herein. In the sixth state, this disclosure relates to a method of manufacturing glass, or to a glass object disclosed herein. The coefficient of thermal expansion ("CTE") is defined as the average linear coefficient of thermal expansion over a temperature range of 20°C to 300°C. It is determined according to DIN ISO 7991:1987. Compressive stress susceptibility ("CSS" or "CSS score") is given in MPa. It is the compressive stress measured in a glass specimen under specific test conditions. For this test, the specimen can be in the form of a thin sheet with a thickness of 200 μm or 30 μm. The specimen is subjected to ion exchange treatment in an alkali metal nitrate bath (100%) for 30 minutes or 15 minutes. The temperature can be selected to obtain the highest chemical stress. The alkali metal nitrate depends on the type of ion exchange treatment to be performed, i.e., the type of ions to be exchanged. Depending on the situation, the alkali metal nitrate is KNO3. 3. The bath temperature is 440°C. The fact that CSS is determined using samples with a thickness of 200 μm or 30 μm in sheet form does not imply limitation to glass objects in sheet form, or even to sheets of that thickness. Rather, CSS is a property of the glass material measured on a sheet made of glass. Although CSS is affected by the thermal history of the glass, it is a characteristic of the glass material or glass object. Notably, CSS is a characteristic of unstrengthened materials or objects (i.e., un-ion-exchange treated). Different thicknesses associated with CSS values ​​are indicated by exponents; for example, a 30 μm thick sheet indicates a CSS value. 30μm . "1000 MPa IOX time" refers to the ion exchange treatment time required for the glass to establish a compressive stress of at least 1000 MPa on its surface. The corresponding experiment is the same as the CSS measurement, i.e., the sample is a 200 μm thick glass sheet immersed in an alkali metal nitrate bath. For sodium nitrate baths, a temperature of 380°C can be selected, and for other alkali metal nitrates, 440°C can be selected. The "1000 MPa IOX time" is achieved when the sample has a compressive stress of at least 1000 MPa. Compressive stress (CS) is the induced compression of the glass network after ion exchange on the glass surface layer. CS typically decreases from its maximum value at the glass surface (surface CS) toward the interior of the glass layer. As is customary in the art, any indication of CS in this disclosure refers to the maximum value of the individual surface. CS can be measured using commercially available testing machines such as the FSM6000LE (Orihara Industrial Co., Ltd.) or the SLP1000 (Orihara Corporation, Japan). Layer depth (DoL) refers to the thickness of the layer on the surface of a glass object at the CS (Cosine Surface), which essentially corresponds to the thickness of the ion exchange layer. DoL can be measured using a commercially available testing machine such as the FSM6000 (Luceo Co., Ltd., Tokyo, Japan) via a waveguide mechanism. "Diffusion rate" (D, in μm) 2 The diffusion rate (in hours, IET) describes the ability of a glass to form an ion exchange layer during chemical strengthening / ion exchange. This property can be calculated by measuring the depth of the ion exchange layer (DoL, in μm) after a specific ion exchange time (IET). Higher diffusion rates result in a deeper DoL after a given ion exchange time. The corresponding formula is D = In this disclosure, unless otherwise specified, any indication of D refers to chemical strengthening with 100% alkali metal nitrate for 30 minutes, wherein for small glass thicknesses, the duration of chemical strengthening may be shortened, for example, to 15 minutes. For sodium nitrate baths, a temperature of 380°C may be selected, and for other alkali metal nitrate baths, 440°C may be selected. Alkali metal nitrates are nitrates containing the next largest diameter alkali metal ion compared to the most abundant alkali metal oxide in the glass composition. The diameter of the alkali metal ion is Cs > K > Na > Li. For example, if the most abundant alkali metal oxide in the glass is sodium, then D refers to strengthening with 100% KNO3 at 440°C. 3. Perform ion exchange for 30 minutes to indicate the time. Central tension (CT): When CS is induced on one or both sides of a glass sheet, tensile stress must be induced in the central region of the glass to balance the stress according to Newton's third principle, and this is called central tension. CT can be calculated from the measured CS and DoL. The term "surface roughness" used in this article refers to the average roughness R. a It is a measure of surface texture. Typically, the amplitude parameter characterizes the surface based on the perpendicular deviation of the roughness profile from the mean line. R a It is the arithmetic mean of the absolute values ​​of these vertical deviations. It can be determined according to DIN EN ISO 4287:2010-07. Warpage is the difference between the maximum and minimum distances between the median surface and a reference plane in a free, unclamped glass object. Warpage can be measured as described in SEMI MF1390. Total thickness variation (TTV) is the difference between the maximum and minimum thickness of a glass object. It can be measured as described in SEMI MF1530. "Hydrolysis resistance" refers to the extracted Na. 2O equivalent. It is determined according to ISO 719:2020-09. It is a measure of the extractability of alkaline compounds from glass in water at 98°C. The measurement result is expressed in micrograms per gram of glass after extraction of Na+. 20 equivalent. "Alkali resistance" refers to the glass's resistance to alkaline corrosion. It is determined according to ISO 695:1991-05 using a boiling aqueous solution of sodium carbonate and sodium hydroxide. The test is performed as described in Section 6.2, "Glass as a Material". The result is the mass loss per unit surface area of ​​the glass sample, expressed in mg / dm³. 2 . "Acid resistance" refers to the glass's resistance to acid corrosion. It is determined according to DIN 12116:2001-03 using a boiling aqueous solution of hydrochloric acid. The test is performed as described in section 6.3, "Glass as a Material". The result is the mass loss per unit surface area of ​​the glass sample, expressed in mg / dm³. 2 . "T" 4” series glass has a viscosity of 10. 4 The temperature at dPas. T 4. Viscosity can be measured by methods known to those skilled in the art for determining glass viscosity, such as according to ISO 7884-2:1987-12. 13 The viscosity of the glass is 10. 13 The temperature at dPas. Similarly, indicated by T. n Other temperatures refer to a glass viscosity of 10. n The temperature at dPas. For example, "T The viscosity of 5" series glass is 10. 5 The temperature at dPas. Three-point bending strength is a test of the flexural strength of a material. It can be determined using the method described in ASTM C1161-13. An illustrative test setup is as follows: a cylindrical steel bearing with a radius of 2 mm; a support span of 16 mm; and a specimen size of 28 x 28 x 0.2 mm. 3 Prepared according to standard procedure 7.2.4; loading speed is 5 mm / min. Vickers hardness is determined using a standard Vickers indenter as specified in ASTM C 1327 (2015). The following parameters are used: Force F n (max) = 1 N; approximate velocity = 4 μm / min; loading rate 2 N / min; holding time 20 s; release rate 6 N / min. Typically, the Vogel-Fulcher-Tammann (VFT) equations are used to calculate the temperature required to achieve a specific viscosity of glass (see the ISO 7884 series of standards, such as ISO 7884-1:1987-12; 7884-2:1987-12; 7884-3:1987-12; 7884-4:1987-12): In the VFT equation, the η-series viscosity, the parameters of the A and B-series materials, the T-series temperature, and the T-series temperature are all considered. 0-series Vogel temperatures. A, B, and T 0 is constant for any given glass. Indications of these constants provide more detailed information about the viscosity behavior of a particular glass composition. The "main surfaces" of an object are the two surfaces with the largest area among all the surfaces of the object. In the compositional sample disclosure, alkali metal oxide R 2O includes oxides of lithium, sodium, potassium, and cesium. Alkaline earth metal oxides R'O include oxides of magnesium, calcium, strontium, and barium. In some specific examples, the glass does not contain cesium, strontium, and / or barium. The glass disclosed herein may contain i. SiO 2, ii. Total Al content of 5.0 to 25.0% by weight 2O 3 and / or B 2O 3, ii. At least 3.0% by weight of ZrO 2 and / or Y 2O 3, iii. One or more oxides selected from the following, in total amounts ranging from 10.0 to 40.0% by weight: ZnO, Li 2O, Na 2O, K 2O, MgO, CaO, SrO, BaO, and combinations thereof, and iv. Selected from P as appropriate. 2O 5 and TiO 2. One or more components. Depending on the circumstances, the glass contains the following components (by weight percentage). Where R The sum of the amounts of alkali metal oxides in the 2O series and the sum of the amounts of all alkaline earth metal oxides in the R'O series. In a specific example, the glass has a total amount of alkali metal oxides, alkaline earth metal oxides, and ZnO not exceeding 27.0 wt%, not exceeding 25.0 wt%, not exceeding 23.0 wt%, or not exceeding 20.0 wt%. This total amount R may vary depending on the circumstances. The 2O+R'O+ZnO system comprises at least 10.0 wt%, at least 12.0 wt%, or at least 14.0 wt%. In specific examples, this total ranges to at most 19.5 wt%, at most 19.0 wt%, or at most 18.0 wt%. For example, the total R... The 2O+R'O+ZnO series is 10.0 to 27.0 wt%, 12.0 to 25.0 wt%, 12.0 to 23.0 wt%, or 14.0 to 19.5 wt%. In a specific example, the glass has a total amount of alkaline earth metal oxides and ZnO of not more than 15.0 wt%, not more than 14.0 wt%, not more than 13.0 wt%, not more than 12.0 wt%, not more than 11.0 wt%, not more than 10.0 wt%, not more than 9.0 wt%, not more than 8.0 wt%, not more than 7.0 wt%, or not more than 6.0 wt%. Depending on the circumstances, this total R'O + ZnO is at least 0.1 wt%, at least 0.2 wt%, at least 0.5 wt%, at least 1.0 wt%, or at least 2.0 wt%. For example, the total R'O + ZnO is 0 to 15.0 wt%, 0 to 14.0 wt%, 0 to 13.0 wt%, 0 to 12.0 wt%, 0 to 11.0 wt%, 0.1 to 10.0 wt%, 0.2 to 9.0 wt%, 0.5 to 8.0 wt%, 1.0 to 7.0 wt%, or 2.0 to 6.0 wt%. The glass may contain one or more alkali metal oxides. Depending on the situation, the weight percentage ratio of the second most abundant alkali metal oxide B to the most abundant alkali metal oxide A is less than 0.23, less than 0.22, less than 0.18, less than 0.16, less than 0.12, or less than 0.10. "Most abundant" alkali metal oxide refers to the alkali metal oxide with the highest weight percentage in the glass. Therefore, "second most abundant" refers to the one with the second highest weight percentage, and so on. In one specific example, A is Na... 2O and B series K 2O, in a specific alternative example, B-series Na 2O and A series K 2O. In some specific cases, this ratio can be as low as 0.10 or lower, 0.08 or lower, or even 0.04 or lower. In some cases, this ratio can be 0. In one specific example, the glass composition has a K value of less than 0.23, less than 0.22, less than 0.18, less than 0.16, less than 0.12, or less than 0.10. The weight value of O relative to Li 2O and Na The ratio of the sum of the weight values ​​of 2O. In some specific examples, this ratio can be as low as 0.10 or lower, 0.08 or lower, or even 0.04 or lower. In some cases, this ratio can be 0. In an alternative specific example, Na The weight value of O relative to Li 2O and K The ratio of the sum of the weight values ​​of 2O is less than 0.23, less than 0.22, less than 0.18, less than 0.16, less than 0.12, or less than 0.10. In some specific examples, this ratio may be as low as 0.10 or lower, 0.08 or lower, or even 0.04 or lower. In some cases, this ratio may be 0. In one specific example, the glass has SiO₂ with a particle size of less than 5.5, or less than 4.9, or less than 4.5. The weight value of 2 relative to Li 2O and Na The ratio of the sum of the weight values ​​of 2O. Depending on the circumstances, this ratio may be at least 2.0, at least 3.0, or at least 3.5. For example, the range of this ratio may be 2.0 to 5.5, 3.0 to 4.9, or 3.5 to 4.5. The inventors have found that this ratio has a positive effect on the thermal expansion and CSS properties of glass. In a specific example, (a) the content of the second most abundant alkali metal oxide, by weight percentage, relative to (b) Al 2O 3 and B 2O 3. The ratio of the total content by weight percentage is 0.0 to 0.4, 0.0 to 0.3, or 0.0 to 0.2. This ratio helps to achieve the desired CSS of the glass. The glass contains SiO in an amount of at least 50.0% by weight, at least 51.0% by weight, at least 53.0% by weight, at least 55.0% by weight, or at least 57.0% by weight, depending on the circumstances. 2. In a specific example, SiO The content of 2 is at most 70.0% by weight, at most 68.0% by weight, at most 66.0% by weight, or at most 64.0% by weight. In some specific examples, the relative amount of this component is 50.0 to 70.0% by weight, 51.0 to 68.0% by weight, 53.0 to 66.0% by weight, or 55.0 to 64.0% by weight. SiO 2. It helps to achieve the desired thermal expansion behavior and chemical resistance. Al 2O 3. This component can be used to help achieve the desired chemically enhanced susceptibility. Depending on the application, the amount of this component is at least 2.0 wt%, at least 3.0 wt%, at least 4.0 wt%, at least 5.0 wt%, at least 6.0 wt%, at least 7.0 wt%, at least 8.0 wt%, or at least 9.0 wt%. In a specific example, Al... 2O The content of 3 may be limited to a maximum of 18.0 wt%, a maximum of 17.0 wt%, a maximum of 16.0 wt%, a maximum of 15.0 wt%, a maximum of 14.0 wt%, a maximum of 13.0 wt%, or a maximum of 12.0 wt%. For example, the content range of this oxide may be 0.0 to 18.0 wt%, 2.0 to 17.0 wt%, 3.0 to 17.0 wt%, 4.0 to 16.0 wt%, 5.0 to 16.0 wt%, 6.0 to 15.0 wt%, 7.0 to 14.0 wt%, 8.0 to 13.0 wt%, or 9.0 to 12.0 wt%. The glass may contain up to 12.0% by weight, up to 11.0% by weight, or up to 10.0% by weight of B. 2O 3. In some specific examples, the content of this component is as low as 8.0% by weight or less, 5.0% by weight or less, or even 3.0% by weight or less. Some specific examples contain less than 0.1% by weight of B. 2O 3. If it exists, B 2O 3. This may help balance the effects of using ZrO. 2. Any tendency to depenetrate. Depending on the situation, B 2O The content of 3 ranges from 0 to 12.0% by weight, 0 to 11.0% by weight, or 0 to 10.0% by weight. In some specific examples, B... 2O The amount of 3 used is at least 1.0% by weight, or at least 2.0% by weight. The glass may contain 5.0 to 25.0% by weight, or, depending on the circumstances, 7.0 to 22.0% by weight, 8.5 to 20.5% by weight, or 10.0 to 17.0% by weight of Al. 2O 3 and / or B 2O 3. In a specific example, Al 2O 3 and B 2O The total content of 3 is less than 20.5% by weight, less than 19.5% by weight, less than 18.0% by weight, less than 17.0% by weight, or less than 16.0% by weight. Depending on the situation, Al... 2O 3 and B 2O The total content of 3 is at least 5.0% by weight, at least 7.0% by weight, at least 8.5% by weight, at least 10.0% by weight, or at least 10.5% by weight. P 2O 5-series optional components. They can be used at a rate of at least 0.5 wt%, at least 1.0 wt%, at least 2.0 wt%, or at least 3.0 wt%. Suitable upper limits are 8.0 wt%, 7.0 wt%, 6.0 wt%, and 5.0 wt%. Depending on the situation, P... 2O The application range of 5 is 0 to 8.0% by weight, 1.0 to 7.0% by weight, 2.0 to 6.0% by weight, or 3.0 to 5.0% by weight. Some specific examples include TiO2 2. As a glass component. It can be used in amounts of 0 to 3.0% by weight, 0 to 2.0% by weight, 0 to 1.0% by weight, or in amounts less than 100 ppm. ZrO A crucial component in 2-series glass compositions. It has been discovered that ZrO2 must be present. 2 and Y 2O At least one of these three factors is required to achieve the desired CSS properties. Ideally, ZrO... The amount of 2 is at least 3.0 wt%, at least 3.5 wt%, at least 4.0 wt%, at least 4.5 wt%, at least 5.0 wt%, at least 5.1 wt%, at least 5.5 wt%, at least 6.0 wt%, at least 6.8 wt%, or at least 7.5 wt%. In specific examples, the amount of this component ranges to at most 15.0 wt%, at most 14.0 wt%, or at most 13.5 wt%. Depending on the situation, ZrO in glass... The content of 2 can range from 3.0 to 15.0 wt%, 3.5 to 15.0 wt%, 4.0 to 15.0 wt%, 4.5 to 15.0 wt%, 5.0 to 14.0 wt%, 5.1 to 14.0 wt%, 5.5 to 14.0 wt%, 6.8 to 13.0 wt%, or 7.5 to 12.5 wt%. In one specific example, ZrO The amount of 2 is at least 4.5% by weight, at least 5.1% by weight, or at least 6.0% by weight. In certain specific examples, ZrO The amount of 2 can be at least 8.0% by weight, at least 9.0% by weight, or >10.0% by weight, such as at least 10.1% by weight. Therefore, in one specific example, ZrO The range of the amount is from 10.1% by weight to 15.0% by weight. Y 2O The amount of 3 may be at least 5.0 wt%, at least 6.0 wt%, at least 7.0 wt%, or at least 8.5 wt%. In specific examples, the amount of this component ranges to at most 20.0 wt%, at most 15.0 wt%, at most 10.0 wt%, or at most 5.0 wt%. Depending on the situation, Y in the glass 2O The content of 3 can range from 0.0 to 20.0 wt%, 0.0 to 15.0 wt%, 0.0 to 10.0 wt%, or 0.0 to 5.0 wt%. ZrO 2 and / or Y 2O 3. It may be present in a total amount of at least 3.0 wt%, at least 5.0 wt%, at least 6.0 wt%, or at least 6.5 wt%. In specific examples, the total amount of such components ranges to at most 21.0 wt%, at most 19.5 wt%, or at most 19.0 wt%. Depending on the situation, ZrO in the glass 2 and / or Y 2O The total content of 3 can range from 3.0 to 21.0 wt%, 5.0 to 21.0 wt%, 6.0 to 21.0 wt%, or 6.5 to 19.5 wt%. In certain specific examples, ZrO 2 and / or Y 2O The total content of 3 may be at least 8.0% by weight, at least 9.0% by weight, or at least 10.1% by weight. Thus, in one specific example, the total amount of these components may range from 10.1% by weight to 15.0% by weight. In some specific examples, (a)ZrO 2 and Y 2O 3. The total content by weight percentage for (b) SiO 2. The ratio of content by weight percentage is from 0.08 to 0.40, 0.10 to 0.35, or 0.19 to 0.25. In one specific example, this ratio is at least 0.08, at least 0.10, at least 0.15, or at least 0.19. The range of this ratio may be at most 0.40, at most 0.38, at most 0.35, at most 0.30, or at most 0.25. Depending on the situation, (a)ZrO 2 and Y 2O 3. The total content by weight percentage relative to (b)Al 2O 3 and B 2O 3. The ratio of the total content by weight percentage is from 0.30 to 2.0, such as 0.35 to 1.80, 0.50 to 1.50, 0.65 to 1.25, or 0.75 to 1.10. In specific examples, this ratio is at least 0.30, at least 0.35, at least 0.50, at least 0.65, or at least 0.75. This ratio may be at most 2.0, at most 1.80, at most 1.50, at most 1.25, at most 1.10, or at most 0.75. In some specific cases, Al 2O 3 and ZrO 2. The total content, expressed as a weight percentage, is 10.0 to 30.0, 15.0 to 28.0, or 22.0 to 26.0. ZrO, expressed as a weight percentage... 2 of the quantity to Al 2O The ratio of 3 can be at least 0.30, at least 0.35, at least 0.45, at least 0.50, or even at least 0.70. Depending on the circumstances, this ratio can be at most 1.80, at most 1.30, or at most 1.10. In some specific examples, the ratio is from 0.30 to 1.80, from 0.45 to 1.30, or from 0.50 to 1.10. It has been found that these ratios provide good chemical resistance in the matrix composition disclosed herein. Depending on the type, the glass contains alkali metal oxides. Alkali metal oxides R The total amount of 2O can be from 10.0 to 30.0% by weight. Depending on the circumstances, this amount is at most 25.0% by weight, at most 22.0% by weight, at most 20.0% by weight, at most 18.0% by weight, or at most 16.0% by weight. To obtain sufficient CSS properties, a specific amount of alkali metal oxide may be required. Therefore, the minimum amount can be 10.0 wt%, 11.0 wt%, 12.0 wt%, or even 13.0 wt%. For example, R The amount of 2O can range from 10.0 to 25.0 wt%, 11.0 to 20.0 wt%, 11.0 to 18.0 wt%, or 12.0 to 16.0 wt%. In certain specific examples, all alkali metal oxides R The total content of 2O is less than 19.5% by weight, less than 19.0% by weight, or less than 18.5% by weight. Depending on the circumstances, (a) all alkali metal oxides R The total content of 2O by weight percentage relative to (b) SiO 2. The ratio of the content by weight percentage is 0.0 to <0.37, 0.0 to <0.35, <0.30 or <0.28. In one specific example, the most abundant alkali metal oxide system in the glass composition is Na. 2O, the second most abundant alkali metal oxide (if present) system K 2O, and the third most abundant alkali metal oxide (if present) system Li 2O. Alternatively, the most abundant alkali metal oxide could be K. 2O, the second most abundant alkali metal oxide (if present) could be Na. 2O, and the third most abundant alkali metal oxide (if present) can be Li 2O. In a specific example, Li O₂ is not the most abundant alkali metal oxide. Depending on the situation, Na₂O₃... 2O or K The most abundant alkali metal oxides in the 2O series. For example, Li 2O can be compared to Na 2O is not abundant and / or K is relatively low 2O is not abundant. Li O2 may be present in the glass in amounts of up to 5.0 wt%, up to 4.0 wt%, up to 3.0 wt%, up to 2.5 wt%, up to 2.0 wt%, up to 1.5 wt%, up to 1.0 wt%, up to 0.5 wt%, up to 0.2 wt%, or up to 0.1 wt%. In some specific examples, the glass does not contain Li. 2O. K 2O may be present in the glass in amounts of up to 20.0% by weight, up to 18.0% by weight, or up to 16.0% by weight. In some specific examples, K The content of 2O may be at least 10.0% by weight or at least 12.0% by weight. In one specific example, the glass composition contains 5.0% by weight or less, 4.5% by weight or less, 4.0% by weight or less, 3.5% by weight or less, 3.0% by weight or less, not more than 2.8% by weight, not more than 2.5% by weight, or not more than 2.0% by weight, or not more than 1.5% by weight of K. 2O. It may be used alternatively at a concentration of at least 1.0% by weight, at least 2.0% by weight, or at least 3.0% by weight. Na O₂ can be present in the glass in amounts of up to 20.0% by weight, up to 18.0% by weight, or up to 16.0% by weight. In some specific examples, Na₂… The content of O2 can be at least 10.0% by weight or at least 12.0% by weight. In one specific example, the glass composition contains no more than 3.0% by weight, no more than 2.8% by weight, no more than 2.5% by weight, or no more than 2.0% by weight of Na. 2O. Depending on the situation, Na 2O and / or K The total amount of 2O can be in the range of 10.0 to 20.0% by weight, 12.0 to 18.0% by weight, or 12.0 to 16.0% by weight. The glass may contain 10.0 to 40.0% by weight of a substance selected from ZnO and Li. 2O, Na 2O, K One or more oxides of O, MgO, CaO, SrO, BaO, and combinations thereof. In most specific examples, this total amount will be less than 30.0% by weight, less than 25.0% by weight, or less than 22.0% by weight. The amount of CaO in the glass may be, for example, up to 7.0 wt%, up to 5.0 wt%, up to 3.0 wt%, up to 2.0 wt%, up to 1.0 wt%, up to 0.5 wt%, up to 0.2 wt%, or up to 0.1 wt%. The glass may also be free of CaO. The amount of SrO in the glass may be, for example, up to 7.0 wt%, up to 5.0 wt%, up to 3.0 wt%, up to 2.0 wt%, up to 1.0 wt%, up to 0.5 wt%, up to 0.2 wt%, or up to 0.1 wt%. The glass may also be free of SrO. The amount of BaO in the glass may be, for example, up to 7.0 wt%, up to 5.0 wt%, up to 3.0 wt%, up to 2.0 wt%, up to 1.0 wt%, up to 0.5 wt%, up to 0.2 wt%, or up to 0.1 wt%. The glass may also be free of BaO. The total amount of CaO, SrO and BaO in the glass may be, for example, up to 7.0 wt%, up to 5.0 wt%, up to 3.0 wt%, up to 2.0 wt%, up to 1.0 wt%, up to 0.5 wt%, up to 0.2 wt%, or up to 0.1 wt%. The glass may also be free of CaO, SrO and BaO. When this disclosure refers to a glass as free from a component or as not containing a particular component, it means that the component is only permitted to be present in the glass as an impurity. This means that it is not added in actual mass. Actual mass refers to amounts less than 500 ppm (by weight), less than 400 ppm (by weight), less than 300 ppm (by weight), less than 200 ppm (by weight), less than 100 ppm (by weight), and specifically less than 50 ppm (by weight) or less than 10 ppm (by weight). The amount of ZnO in the glass can range from 0 to 5.0 wt%, 0 to 4.0 wt%, 0 to 3.0 wt%, or 0 to 2.0 wt%. Some specific examples contain less than 100 ppm of ZnO. In some specific examples, the amount of ZnO can range from 0.5 to 5.0 wt%, or 1.0 to 4.0 wt%. The total amount of alkaline earth metal oxides plus the amount of ZnO can be 0 to 15.0 wt%, 0 to 10.0 wt%, 0 to 7.5 wt%, or 0 to 5.0 wt%. Depending on the circumstances, the amount of alkaline earth metal oxide R'O is less than 10.0 wt%, less than 6.0 wt%, less than 4.0 wt%, or less than 2.0 wt%. It may alternatively be used in proportions of at least 1.0 wt%, at least 2.0 wt%, or at least 3.0 wt%. In a specific example, (a) the total content of all alkaline earth metal oxides R'O by weight percentage relative to (b) SiO 2. The ratio of content by weight percentage is 0.00 to <0.06, 0.0 to <0.05, <0.04, <0.03, <0.02, or <0.01. Depending on the circumstances, this ratio may be >0.01, >0.02, or >0.03. For example, this ratio may be >0.01 to <0.06, or >0.02 to <0.05. In some specific examples, the glass may contain 0.0 to 6.0 wt%, 0.1 to 5.0 wt%, or 0.5 to 4.0 wt% of MgO. Depending on the circumstances, the amount of MgO may be at least 0.1 wt%, at least 0.5 wt%, or at least 1.0 wt%, for example, at least 1.5 wt%, at least 2.0 wt%, or at least 2.5 wt%. MgO can be advantageous in terms of devitrification resistance. Furthermore, MgO can be advantageous in terms of chemical strengthening effectiveness. In some specific examples, the glass does not contain MgO. Depending on the circumstances, the total content of MgO and the second most abundant alkali metal oxide, by weight percentage, is less than 8.0 wt%, less than 6.0 wt%, or less than 4.0 wt%. In one specific example, MgO may be used at a proportion of at least 1.0 wt%, at least 2.0 wt%, or at least 3.0 wt%. An optional glass disclosed herein comprises the following components (by weight percentage) An optional glass disclosed herein comprises the following components (by weight percentage) An optional glass disclosed herein comprises the following components (by weight percentage) An optional glass disclosed herein comprises the following components (by weight percentage) An optional glass disclosed herein comprises the following components (by weight percentage) An optional glass disclosed herein comprises the following components (by weight percentage) One of the optional potassium- and yttrium-containing glasses disclosed herein comprises the following components (by weight percentage). One of the optional potassium-containing glasses disclosed herein comprises the following components (by weight percentage) One of the optional yttrium-containing glasses disclosed herein comprises the following components (by weight percentage). One of the optional borosilicate glasses disclosed herein comprises the following components (by weight percentage) One of the optional phosphorus-containing glasses disclosed herein comprises the following components (by weight percentage). One of the optional magnesium-containing glasses disclosed herein comprises the following components (by weight percentage) One of the optional phosphorus and zinc-containing glasses disclosed herein comprises the following components (by weight percentage). One of the optional zinc-containing glasses disclosed herein comprises the following components (by weight percentage) One of the optional glass options disclosed herein contains the following components (by weight percentage) R'O represents the sum of all alkaline earth metal oxides. Glass may contain one or more clarifying agents, such as CeO2. 2. SnO 2. Cl, SO 3. Fe 2O 3. It can be used as a clarifying agent as needed. Therefore, the glass visible contains Fe. 2O 3. It is best to avoid using toxic clarifying agents such as arsenic and antimony, so that the total amount of arsenic and antimony is less than 100 ppm. Due to toxicity concerns, the total amount of lead and bismuth is less than 100 ppm. In specific examples, the glass may contain less than 1% by weight of F. The coefficient of thermal expansion of parametric glass can be less than 8.8*10. -6 K -1 Less than 8.5*10 -6 K -1 or less than 8.2*10 -6 K -1 In the best-case scenario, the coefficient of thermal expansion is at most 10.0 × 10⁻⁶. -6 K -1 At most 9.5*10 -6 K -1 Or at most 9.2*10 -6 K -1 Depending on the circumstances, the coefficient of thermal expansion should be at least 6.0 × 10⁻⁶. -6 K -1 At least 7.0*10 -6 K -1 Or at least 7.2*10 -6 K -1 In this specific example, the coefficient of thermal expansion of glass ranges from 6.0 to 10⁻⁶. -6 K -1 Up to 9.2*10 -6 K -1 7.0*10 -6 K -1 Up to 8.8*10 -6 K -1 Or 7.2*10 -6 K -1 Up to 8.2*10 -6 K -1 In certain specific cases, the coefficient of thermal expansion is less than 8.0 × 10⁻⁶. -6 K -1 or even less than 7.9*10 -6 K -1 . The glass may have a Young's modulus of at least 70 GPa, at least 74 GPa, at least 75 GPa, or at least 78 GPa. Depending on the specific application, the Young's modulus may be at most 90 GPa, at most 88 GPa, or at most 86 GPa. In specific examples, the Young's modulus of the glass ranges from 70 GPa to 90 GPa, 74 GPa to 88 GPa, or 75 GPa to 86 GPa. In some specific examples, the Young's modulus is at least 80 GPa or even at least 82 GPa. In one specific example, the glass has a Poisson's ratio of 0.220 to 0.260, 0.225 to 0.255, or 0.230 to 0.250. Depending on the circumstances, the Poisson's ratio may be less than 0.260, less than 0.255, or less than 0.250. In a specific example, the Poisson's ratio is at least 0.220, at least 0.225, or at least 0.230. Depending on the situation, the glass has a strength of 2.530 to 2.800 g / cm³. 3 2.580 to 2.700 g / cm³ 3 Or 2.600 to 2.690 g / cm³ 3 The density. The density can be at least 2.530 g / cm³. 3 At least 2.580 g / cm 3 Or at least 2.600 g / cm 3 In this specific example, the density will be at most 2.800 g / cm³. 3 At most 2.700 g / cm³ 3 At most 2.690 g / cm³ 3 Or at most 2.680 g / cm 3 . In one specific example, the glass may have a glass transition temperature T of at least 590°C, at least 610°C, or at least 625°C. g In some specific cases, T g It may even be at least 655°C or at least 665°C, however, in certain specific examples it may even have a T value higher than 710°C. g Value. T depends on the situation. g This can be below 860℃ or below 810℃. In a specific example, T g The range is 590℃ to 860℃, 610℃ to 860℃, or 625℃ to 810℃. High T g Allows for high temperatures during ion exchange treatment. With lower T g Compared to glass, it has high T g The glass will relax less of the stress caused by ion exchange at higher temperatures. Higher temperatures accelerate the ion exchange process, making ion exchange more economical. In one specific example, the glass may have a strain point of at least 580°C, at least 600°C, or at least 615°C. In some specific examples, the strain point may even be at least 645°C or at least 655°C; however, certain specific examples may even have strain point values ​​higher than 700°C. Depending on the circumstances, the strain point may be less than 850°C or less than 800°C. In specific examples, the strain point ranges from 580°C to 850°C, 600°C to 850°C, or 615°C to 800°C. A high strain point allows for high temperatures during ion exchange treatment. Compared to glass with a lower strain point, glass with a high strain point will relax less of the stress caused by ion exchange at higher temperatures. Higher temperatures accelerate the ion exchange process, making ion exchange more economical. Depending on the circumstances, the glass composition exhibits one or more of the following: a temperature T of at least 1040°C, at least 1090°C, at least 1140°C, at least 1190°C, at least 1200°C, or at least 1250°C. 4. • Temperatures of at least 1180°C, at least 1240°C, at least 1300°C, at least 1350°C, at least 1400°C, or at least 1450°C (T) 3. • VFT constant A < 0.00, depending on -4.00 to -2.00; • VFT constant B > 5,000℃, depending on 6,000℃ to 8,000℃; and • VFT constant T 150 to 550℃, such as 200 to 400℃ or up to 355℃. 0. The glass disclosed herein can exhibit a pronounced steepness in its temperature-viscosity curve. The steepness of the curve can be quantified in terms of temperature T. 4 and T 7.6 The difference between them. For the glass disclosed herein, this difference may be at least 250 K, at least 265 K, at least 280 K, or at least 300 K. Depending on the circumstances, this value may not exceed 400 K, 380 K, or 360 K. For example, temperature T... 4 and T 7.6 The difference can be in the range of 250 to 400 K, 265 to 380 K, or 280 to 360 K. All these parameters describe the viscosity behavior of the glass. The glass disclosed herein has a considerably high characteristic temperature, which allows for the use of high temperatures during ion exchange, thereby accelerating the ion exchange process. A key property of the glass disclosed herein is its ability to establish high compressive stress in a very short time. This property is quantified by the CSS fraction (or simply "CSS"), which is equivalent to the compressive stress formed in the test specimen. Further indicators used to measure the CSS are the glass thickness. The glass composition disclosed herein exhibits significant CSS values ​​even at small glass thicknesses. Depending on the circumstances, the glass disclosed herein has a CSS of at least 800 MPa, at least 900 MPa, at least 1000 MPa, at least 1150 MPa, or even at least 1250 MPa. 200μm This is a very significant compressive stress susceptibility, allowing very high compressive stress to be introduced into the glass within a short period of time. Depending on the situation, CSS... 200μm The range is at most 1800 MPa, at most 1600 MPa, or at most 1500 MPa. In a specific example, CSS... 200μm The range is 800 MPa to 1800 MPa, 900 MPa to 1600 MPa, or 1000 MPa to 1500 MPa. Prior art glass compositions could only achieve such high compressive stresses after very long ion exchange times. Typically, prior art glass compositions could only achieve 1000 MPa of compressive stress or none at all after more than 4 hours of ion exchange. Depending on the circumstances, the glass disclosed herein has a CSS of at least 600 MPa, at least 700 MPa, at least 800 MPa, at least 850 MPa, or even at least 900 MPa. 30μm Depending on the situation, CSS 30μm The range is at most 1200 MPa, at most 1100 MPa, or at most 1000 MPa. In a specific example, CSS... 30μm The range is 600 MPa to 1200 MPa, 700 MPa to 1100 MPa, or 800 MPa to 1000 MPa. In a specific example, CSS... 30μm The score refers to CSS 30μm Previous glass compositions could not achieve such high compressive stress at such a small thickness. Another way to indicate the significant property of this glass to withstand compressive stress is the 1000 MPa 10X time, which is the duration of ion exchange treatment in an alkali metal nitrate bath required for the glass sample to reach 1000 MPa compressive stress at its surface. Depending on the circumstances, the 1000 MPa 10X time for the glass disclosed herein is less than 60 minutes, less than 30 minutes, or even less than 20 minutes. In one specific example, the 1000 MPa 10X time refers to the 10X time in a potassium nitrate bath. The remarkable ability of this glass to be chemically strengthened is further illustrated by its diffusivity. High diffusivity means that the glass can receive a sufficiently deep compressive stress layer in a short time, thus making the glass manufacturing process more economical. In some specific examples, the glass disclosed herein has a depth of at least 10 μm. 2 / h, 14μm 2 / h, 18μm 2 / h, 25μm 2 / h, 35μm 2 The diffusion rate per hour. Depending on the situation, this value can range up to 80 μm. 2 / h, 70μm 2 / h, or 60μm 2 / h. In some specific cases, the diffusion rate is 10 to 80 μm. 2 / h, 14 to 70μm 2 / h or 18 to 60 μm 2 / h. The glass disclosed herein may be characterized by one or more of the following chemical resistances: (a) a hydrolysis resistance value of less than 100, less than 60, less than 40, or less than 30 in μg / g sodium equivalent; (b) a hydrolysis resistance value in mg / dm³. 2 The alkali resistance value of the loss-in-weight meter is less than 50, less than 40, less than 30, or less than 20; (c) in mg / dm³ 2 The acid resistance value of the loss-in-weight meter is less than 30, less than 20, less than 15, less than 10, or less than 5; Depending on the circumstances, the hydrolysis resistance value, expressed in μg / g sodium equivalent, may be at least 1, at least 5, or at least 10. In one specific example, the value is expressed in mg / dm³. 2The alkali resistance value of the loss-in-weight meter is at least 1, at least 5, or at least 8. Furthermore, it is expressed in mg / dm³. 2 The acid resistance value of the loss-in-weight meter can be at least 1, at least 2, or at least 3. The glass disclosed here exhibits significant compressive stress susceptibility in MPa relative to alkali metal oxides R in weight percentage. Total content of 2O and alkaline earth metal oxides R'O Previous technology glasses required relatively high contents of alkali metal oxides or alkaline earth metal oxides to achieve compressive stress during ion exchange. In contrast, the compositions described herein achieve high compressive stress even with moderate proportions of alkali and alkaline earth metals. Depending on the situation, The number of saturations must be at least 35, at least 50, at least 60, at least 80, or at least 90. In some specific cases, The number must be at least 100, at least 120, or at least 140. Depending on the situation, The range is at most 250, at most 200, or at most 150. In some specific examples, The range is 50 to 250, 60 to 200, or 60 to 150. For readability reasons, the unit (MPa / weight%) for this parameter is not indicated. In one specific example, this disclosure relates to CSS having a strength of at least 85, at least 100, at least 110, at least 120, or at least 130 MPa. 200μm The coefficient of thermal expansion in ppm / K over a temperature range of 20 to 300°C The glass. Prior art glass compositions exhibit high thermal expansion (typically above 9.0 x 10⁻⁶). -6 K -1 The disadvantages of ) are discussed. The glass composition disclosed herein provides high CSS at low CTE. 200μm For example, those with 100 to 250, 110 to 220, or 120 to 200 .For example, The range can be up to 250, up to 220, or up to 200. For readability reasons, the unit (MPa*K / ppm) for this parameter is not indicated. The refractive index of glass used in displays should not be too high to provide limited reflectivity. Depending on the circumstances, the refractive index n of the glass disclosed herein... dLess than 1.600, less than 1.550, or even less than 1.540. In some specific examples, the refractive index ranges from 1.520 to 1.600, or from 1.530 to 1.550. In one specific example, the glass is non-opaque, specifically at the operating point (viscosity 10). 4 (dPas) at this point. This is useful for enabling glass to be produced in a down-draw process. In one specific example, glass can be produced by a down-draw process such as slot down-draw or overflow fusion down-draw. It is desirable to achieve this in 10... 4 There is absolutely no devitrification at the operating point of dPas. However, at slightly higher viscosities, specifically at 10... 5 At a viscosity of dPas, it can tolerate small crystal growth rates, and at 10 5 Glass with a crystal growth rate of no more than 0.5 μm / min at a viscosity of dPas is generally compatible with production by pull-down. Therefore, for the purposes of this disclosure, the devitrification resistance can be achieved at 10. 5 The crystal growth rate is expressed as the crystal growth rate at a viscosity of dPas. The lower the crystal growth rate, the higher the resistance to devitrification and therefore the higher the yield. The measurement of crystallization rate is well known. The crystallization rate is measured along the formed crystal, that is, at its maximum extension. Specifically, the crystallization rate is determined when the glass is subjected to gradient tempering (e.g., using a gradient furnace). The lower devitrification temperature (LDT) is the temperature at which devitrification begins in an elevated temperature configuration. Above the liquidus temperature (also known as the upper devitrification temperature (UDT)), crystallization will not occur even after a considerable period of time. LDT and UDT values ​​typically differ between different glasses. Unless otherwise indicated, the terms "crystallization" and "devitrification" are used synonymously herein. If crystallization occurs, it takes place at temperatures above the lower devitrification temperature (LDT) and below the upper devitrification temperature (UDT), thus falling within the range between the LDT and UDT. Typically, different temperatures are tested to determine the crystal growth rate at different viscosities. This also allows us to determine the LDT and UDT as the lower and upper limits of the temperature range in which crystallization occurs, respectively. Crystal growth rate can be determined by heat-treating glass in a gradient furnace with a temperature ramp for 16 hours. A gradient furnace consists of furnaces with different heating zones, and therefore furnaces with different temperature regions. The temperature ramp means that the glass's temperature is lower than the temperature of any furnace region before it is placed in the furnace. Therefore, the glass's temperature is raised by placing it in the furnace, regardless of the furnace region where the glass is placed. Thus, devitrification can be measured by heat-treating the glass in a (preheated) gradient furnace with different temperature zones for 16 hours. Because the gradient furnace is divided into different temperature positions or zones, the gradient is based on position, not time. The furnace, divided into several heating zones, allows for simultaneous testing of different temperatures (and therefore different viscosities). This is a particular advantage of gradient furnaces. Temperatures should be selected to determine the crystallization rate at different temperatures (and therefore different viscosities) within the range between LDT and UDT. If the LDT and UDT systems are unknown, testing over a relatively large temperature range makes it useful to determine the LDT and UDT systems. For example, the lowest temperature in the gradient furnace can be selected, approximately 350 K lower than the glass processing temperature (operating point). The operating point corresponds to 10... 4 The viscosity of dPas. As mentioned above, in 10 5 The crystal growth rate at viscosities of dPas is related to the manufacturability via a pull-down process. Depending on the application, the glass of this invention is quite resistant to devitrification, to the point that at 10... 5 At a viscosity of dPas, specifically when the glass is heat-treated in a gradient furnace with an increasing temperature scheme for 16 hours, the crystal growth rate is at most 0.5 μm / min, at most 0.4 μm / min, at most 0.3 μm / min, at most 0.2 μm / min, at most 0.1 μm / min, at most 0.05 μm / min, at most 0.02 μm / min, or at most 0.01 μm / min. In one specific example, at 10 5 No devitrification occurred at dPas viscosity. Importantly, as at 10 5 If no devitrification occurs at the viscosity of dPas, it cannot be determined whether it will occur at 10. 5 Crystal growth rate at dPas. At 10 5 The absence of devitrification at dPas viscosity can also be expressed as a crystal growth rate of 0 μm / min. Depending on the circumstances, glass particles, specifically those with a diameter of approximately 2 to 3 mm, are used to determine the crystallization rate. These glass particles are placed on a support, such as a platinum support used for gradient tempering. For example, the support may have recesses, each for receiving the glass particles, and each recess may have a hole at its bottom so that the crystallization rate can be determined microscopically. Given the size of the glass particles, the recesses may each have a diameter of 2 mm and the holes may each have a diameter of 0.9 mm. Following heat treatment, the crystal growth rate occurring within a specific temperature range (and therefore at a specific viscosity) can be determined microscopically. At 10 5 The crystal growth rate at dPas viscosity is determined based on the known correlation between temperature and viscosity. Specifically, based on the glass composition, it is known which viscosity corresponds to which temperature. LDT and UDT can be determined as the lower and upper limits of the temperature range in which crystallization occurs, respectively. Since it is known which location in the furnace has which temperature and which glass particle is located in which position in the furnace during heat treatment, different glass particles can be easily assigned to different temperatures in the gradient furnace. The glass articles disclosed herein may have a thickness of 1,000 μm or less and comprise or consist of the glass described herein. Generally, such articles may be referred to as thin glass articles or glass sheets. They may have a thickness of less than 850 μm, less than 500 μm, less than 300 μm, less than 200 μm, or less than 100 μm. In some specific examples, the thickness may be as low as 80 μm or less, or 70 μm or less. Some articles have a thickness of 50 μm or less, or 40 μm or less. Such thin glass articles have bendable and / or foldable properties. For such flexible or foldable protective glass, a desired thickness may be less than 100 μm, less than 80 μm, less than 60 μm, or less than 40 μm. A minimum thickness may be required to make the article sufficiently impact-resistant. The minimum thickness may be at least 5 μm, at least 10 μm, or at least 15 μm. Due to its low CTE and other desirable properties, glass articles can be manufactured with warpage less than 3.0 mm, less than 2.0 mm, or less than 1.0 mm. Typically, glass articles are manufactured using a stretching process, where temperature differences between different parts of the glass cause warpage. Because the glass disclosed herein possesses a small CTE and other desirable properties such as good viscosity characteristics, articles with low warpage can be obtained. In certain specific examples, the warpage is at least 5 μm, at least 10 μm, at least 100 μm, or at least 250 μm. Depending on the circumstances, the object may have a total thickness variation of less than 15 μm, less than 10 μm, less than 7 μm, or less than 5 μm. In a specific example, the total thickness (TTV) can range from 1 μm to 10 μm. In one specific example, the TTV is the thickness of the glass object at ±10%, ±5%, or ±3%. The object may be at least 10 cm in size. 2 At least 15 cm 2 Or at least 20 cm 2 The area. In a specific example, the object may have an area of ​​less than 10,000 cm². 2 Less than 1,000 cm 2 or less than 200 cm 2 The area. The object may have a surface roughness R of no more than 5.0 nm, no more than 3.0 nm, or no more than 1.5 nm on one or two of its main surfaces. a This very small roughness can be achieved in the pull-down process. The object may exhibit significant chemical resistance on one or both of its main surfaces. Chemical resistance can be characterized by one or more of the following: (a) a hydrolysis resistance value in μg / g sodium equivalent less than 100, less than 60, less than 40, or less than 30; (b) a value in mg / dm³. 2 The alkali resistance value of the loss-in-weight meter is less than 50, less than 40, less than 30, or less than 20; (c) in mg / dm³ 2 The acid resistance value of the loss-in-weight meter is less than 30, less than 20, less than 15, less than 10, or less than 5. Glass objects may have a Vickers hardness of at least 580, at least 590, or at least 600. Depending on the circumstances, the Vickers hardness ranges from 580 to 800, 590 to 700, or 600 to 630. In one specific example, the glass object exhibits excellent three-point flexural strength, displaying a three-point flexural strength of at least 100 MPa, at least 200 MPa, or at least 300 MPa. Notably, this strength can be achieved even without ion exchange strengthening. Starting with this high strength, the strength of the object after ion exchange is even more significant. Depending on the application, the three-point flexural strength can range from 100 MPa to 600 MPa, 200 MPa to 500 MPa, or 300 MPa to 400 MPa. The strengthened glass object may contain an ion-exchange layer on one or two of its main surfaces. The ion-exchange layer imparts high strength to the glass object. Depending on the application, the object may have compressive stresses of at least 400 MPa, at least 700 MPa, at least 800 MPa, or at least 900 MPa on one or two of its main surfaces. In specific examples, the range of compressive stresses may be up to 1800 MPa, up to 1600 MPa, up to 1500 MPa, or up to 1400 MPa. For example, the range of compressive stresses may be from 400 MPa to 1800 MPa, from 700 MPa to 1600 MPa, or from 800 MPa to 1400 MPa. In one specific example, the glass object has a thickness of 20 to 40 μm, such as 25 to 35 μm, and has a compressive stress of at least 800 MPa, at least 850 MPa, or at least 900 MPa on one or both of its main surfaces. Depending on the circumstances, the glass object exhibits a DoL of 6 to 12 μm or 7 to 11 μm on one or both of its main surfaces. For example, the DoL may be at least 6 μm, at least 7 μm, or at least 8 μm. Alternatively or additionally, the DoL may range from up to 15 μm, up to 13 μm, up to 12 μm, or up to 11 μm. In one specific example, DoL refers to 15 to 25% of the object thickness, or 16 to 20% of the object thickness. In another specific example, DoL refers to at least 15%, at least 16%, or at least 17% of the object thickness. DoL can be at most 33%, at most 25%, or at most 20% of the object thickness. In this document, DoL refers to the depth of a compressive stress layer. The total DoL of all compressive stress layers can be greater. One of the striking properties of the disclosed objects is that very high compressive stress can be achieved even in thin objects. In specific examples, the glass object has a compressive stress ratio in MPa to object thickness in μm of at least 4.0, at least 5.0, at least 6.0, or at least 10.0 on one or two of its main surfaces. In specific examples, this value can reach up to 40.0, up to 35.0, or up to 30.0. Depending on the circumstances, the ratio of compressive stress in MPa to object thickness in μm is at most 10.0, up to 8.0, or up to 7.0. In some specific examples, the ratio of compressive stress in MPa to object thickness in μm ranges from 4.0 to 40.0, 5.0 to 35.0, 5.0 to 30.0, or 10.0 to 29.0. In a particular specific example, this value ranges from 20.0 to 30.0. In one specific example, the ratio of compressive stress in MPa to the thickness of the object is at least 20.0 or at least 25.0. Depending on the circumstances, the object may have a ratio of compressive stress in MPa to ion exchange layer depth in μm of at least 50, at least 75, or at least 90 on one or two of its main surfaces. In one specific example, this value may even be at least 100, at least 120, or at least 140. For example, the ratio of compressive stress in MPa to ion exchange layer depth in μm may range from 50 to 400, 75 to 300, or 90 to 200. In some specific examples, the ratio of compressive stress in MPa to ion exchange layer depth in μm is at most 400, at most 300, or at most 200. In one specific example, this disclosure relates to a glass object exhibiting a three-point bending strength of at least 400 MPa, at least 500 MPa, or at least 600 MPa. In one specific example, the glass object exhibits excellent three-point bending strength, displaying a three-point bending strength of at least 400 MPa, at least 500 MPa, or at least 600 MPa. Achieving this strength is noteworthy. Depending on the application, the three-point bending strength can range from 400 MPa to 1200 MPa, 500 MPa to 1000 MPa, or 600 MPa to 800 MPa. Glass and / or glass objects for electronic devices may be used in electronic devices such as laptops, smartphones, tablets, and other handheld or wearable devices. Glass and / or glass objects may be part of a display. Therefore, an electronic device according to this disclosure may include glass or glass objects according to this disclosure. The electronic device may include a display, wherein the display includes the glass and / or glass objects of this disclosure. The glass objects may be protective glass for the electronic device. The electronic device may be a flexible and / or foldable device, such as a flexible and / or foldable smartphone or tablet. The glass can be produced by melting a batch of raw materials suitable for obtaining the compositions disclosed herein. For example, the glass can be melted in a platinum crucible. After melting, one or more refining agents can be used to clarify the glass melt to remove air bubbles. Instead of using chemical refining agents, physical refining methods such as vacuum refining can also be used. In industrial-scale production, glass objects can be manufactured using float glass or downdraw processes such as orifice downdraw or overflow melt downdraw. Orifice downdraw is preferred because it allows for very small thicknesses. After formation, the object can be strengthened by ion exchange (also known as "chemical strengthening"). Strengthening may involve immersing the object in a molten salt bath. The salt is selected based on the desired ion exchange process. In a preferred embodiment, the salt will be an alkali metal salt, such as an alkali metal nitrate. In some embodiments, the salt bath contains potassium nitrate, and, depending on the circumstances, approximately 100% KNO3. 3. Chemical strengthening of glass objects through ion exchange is well-known to those skilled in the art. The strengthening process is accomplished by immersing the glass object in a salt bath containing monovalent ions, allowing them to exchange with alkali metal ions within the glass. The monovalent ions in the salt bath have a higher ion concentration than the alkali metal ions (e.g., Na+) within the glass. + K + and / or Cs + Large radius. The compressive stress of glass is established after ion exchange caused by the compression of larger ions into the glass network. After ion exchange, the strength of the glass is significantly improved. In addition, the CS (scratch resistance) caused by chemical strengthening improves the bending properties of strengthened glass objects and enhances their scratch resistance. Typical salt systems used for chemical strengthening, for example, those containing K... + Molten salt or a mixture of salts. Optional salt bath systems for chemical strengthening contain Na. + and / or containing K + A molten salt bath or a mixture thereof. Optional salt system: NaNO₃. 3. KNO 3. CsNO 3. NaCl, KCl, CsCl, Na 2SO 4. K 2SO 4. Cs 2SO 4. Na 2CO 3. K 2CO 3. Cs 2CO 3 and K 2Si 2O 5. Additives such as NaOH, KOH, and other sodium or potassium salts are also used to better control the rate of ion exchange for chemical fortification. Ion exchange can be, for example, in KNO3. The process is carried out at temperatures ranging from 300°C to 480°C or 340°C to 480°C, specifically from 340°C to 450°C or 390°C to 450°C. Chemical strengthening is not limited to a single step. It can include multiple steps in one or more salt baths with different concentrations of alkali metal ions and / or different ions in the salt bath to achieve better strengthening performance. Therefore, chemically strengthened glass objects can be strengthened in one step or in several steps (e.g., two steps). Two-step chemical strengthening is particularly suitable for Li-containing glass. 2O glass, because lithium can exchange with both sodium and potassium ions. The inventors have discovered that glass exhibits very rapid ion exchange and achieves high compressive stress within a short time. The immersion time of an object in a molten salt bath at a specified temperature can range from 20 minutes to 12 hours, 25 minutes to 4 hours, or 30 minutes to 2 hours. Depending on the circumstances, this time is at least 20 minutes, at least 25 minutes, or at least 30 minutes. In a specific example, the ion exchange time is no more than 2 hours, or no more than 1 hour. Depending on the circumstances, the temperature of the salt bath will be at T during ion exchange. g -400 to T g -100℃ or T g -250 to T g The temperature range is -150℃. In one specific example, the method includes: • melting a batch of raw material as needed to obtain glass according to the present disclosure; • forming a glass article, such as the glass article described herein; and • strengthening the article by ion exchange treatment in an ion exchange bath. The items disclosed herein, each of which presents specific examples of the glass, glass objects and other forms disclosed herein as described in detail above. The first item concerns a type of glass containing i. SiO 2, ii. Total Al content of 5.0 to 25.0% by weight 2O 3 and / or B 2O 3, ii. At least 3.0% by weight of ZrO 2 and / or Y 2O 3, iii. One or more oxides selected from the following, in total amounts ranging from 10.0 to 40.0% by weight: ZnO, Li 2O, Na 2O, K 2O, MgO, CaO, SrO, BaO, and combinations thereof, and iv. Selected from P as appropriate. 2O 5 and TiO 2. One or more components. The second term pertains to the glass described in the first term, which has a diameter less than 10.0 x 10⁻⁶. -6 K -1 Less than 9.5*10 -6 K -1 Less than 9.2*10 -6 K -1 Less than 8.8*10 -6 K -1 Less than 8.5*10 -6 K -1 or less than 8.2*10 -6 K -1 Its coefficient of thermal expansion in the temperature range of 20 to 300℃. The third item relates to the glass of the first or second item, which has a Young's modulus of at least 70 GPa, at least 74 GPa, at least 75 GPa, or at least 78 GPa. The fourth item relates to glass of at least one of the first to third items, having a Poisson's ratio of 0.220 to 0.260, 0.225 to 0.255, or 0.230 to 0.250. The fifth item concerns glass of at least one of the first to fourth items, which has a time of less than 60 minutes at 1000 MPa IOX. The sixth item concerns glass of at least one of the first to fifth items, having a density of 2.530 to 2.800 g / cm³. 3 2.580 to 2.700 g / cm³ 3 Or 2.600 to 2.690 g / cm³ 3 The density. The seventh item relates to a glass of at least one of the first to sixth items, having a glass transition temperature T of at least 590°C, at least 610°C, or at least 625°C. g . Item 8 concerns glass of at least one of items 1 through 7, having a strength of at least 800 MPa, and, where applicable, at 100% KNO₃. The definition of CSS in 3 baths 200μm Fractional compressive stress susceptibility. Item 9 concerns glass of at least one of items 1 through 8, characterized by one or more of the following chemical resistances: (a) a hydrolysis resistance value in μg / g sodium equivalent less than 100, less than 60, less than 40, or less than 30; (b) a chemical resistance value in mg / dm³. 2 The alkali resistance value of the loss-in-weight meter is less than 50, less than 40, less than 30, or less than 20; (c) in mg / dm³ 2 The acid resistance value of the loss-in-weight meter is less than 30, less than 20, less than 15, less than 10, or less than 5. The tenth item relates to a glass of at least one of the first to ninth items, having a compressive stress susceptibility in MPa of at least 35, at least 50, at least 60, or at least 80 relative to the weight percentage of alkali metal oxide R. Total content of 2O and alkaline earth metal oxides R'O . The eleventh item relates to a glass of at least one of the first to tenth items, having a compressive stress susceptibility of at least 85, at least 100, at least 110, or at least 120 in MPa relative to a coefficient of thermal expansion in ppm / K over a temperature range of 20 to 300°C. . Item 12 relates to a glass of at least one of Items 1 to 11, having a total amount of not more than 27.0% by weight of alkali metal oxides, alkaline earth metal oxides and ZnO. The thirteenth item relates to a glass of at least one of the first to twelfth items, wherein the weight percentage ratio of the second most abundant alkali metal oxide B to the most abundant alkali metal oxide A is less than 0.23, less than 0.22, or less than 0.18. The fourteenth term relates to the glass in the thirteenth term, where A = Na. 2O and B = K 2O, or B = Na 2O and A = K 2O. The fifteenth item concerns glass of at least one of the first to fourteenth items, having a K value of less than 0.23, less than 0.22, or less than 0.18. The weight value of O relative to Li 2O and Na The ratio of the sum of the weight values ​​of 2O. Item sixteen pertains to glass containing at least one of items one through fourteen, having a Na content of less than 0.23, less than 0.22, or less than 0.18. The weight value of O relative to Li 2O and K The ratio of the sum of the weight values ​​of 2O. Item 17 relates to glass of at least one of items 1 to 16, having SiO₂ content less than 5.5, less than 4.9, or less than 4.5. The weight value of 2 relative to Li 2O and Na The ratio of the sum of the weight values ​​of 2O. The eighteenth item relates to a glass comprising at least one of the first to seventeenth items, wherein the glass comprises at least 50.0% by weight or at least 55.0% by weight of SiO₂. 2, and / or - less than 3.0% by weight of K 2O. Item 19 concerns glass of at least one of items 1 through 18, wherein Al 2O 3 and B 2O The total content of 3 is less than 20.5% by weight, less than 18.0% by weight, or less than 17.0% by weight. Item 20 concerns glass of at least one of items 1 through 19, wherein Al 2O 3 and B 2O The total content of 3 is at least 5.0% by weight, at least 7.0% by weight, at least 8.5% by weight, or at least 10.5% by weight. The twenty-first item concerns a glass containing at least one of the first to twentieth items, wherein all alkali metal oxides R The total content of 2O is less than 20.5% by weight, less than 19.5% by weight, or less than 18.5% by weight. Item 22 concerns the glass of at least one of items 1 to 21, wherein (a) the content of the second most abundant alkali metal oxide, by weight percentage, is related to (b) Al 2O 3 and B 2O 3. The ratio of the total content by weight percentage is 0.0 to 0.4, 0.0 to 0.3, or 0.0 to 0.2. Item 23 relates to a glass comprising at least one of items 1 to 22, wherein the total content of MgO and the second abundant alkali metal oxide, by weight percentage, is less than 8.0 wt%, less than 6.0 wt%, or less than 4.0 wt%. Article 24 relates to glass of at least one of Articles 1 to 23, wherein the glass comprises the following components (by weight percentage). Where R The sum of the amounts of alkali metal oxides in the 2O series and the sum of the amounts of all alkaline earth metal oxides in the R'O series. Article 25 relates to glass of at least one of Articles 1 to 24, wherein the glass comprises the following components (by weight percentage). Article 26 relates to glass of at least one of Articles 1 to 24, wherein the glass comprises the following components (by weight percentage). Article 27 relates to glass of at least one of Articles 1 to 24, wherein the glass comprises the following components (by weight percentage). Item 28 relates to glass of at least one of items 1 to 24, wherein the glass comprises the following components (by weight percentage). Item 29 concerns glass containing at least one of items 1 to 28, wherein ZrO The amount of 2 is at least 4.5% by weight, at least 5.1% by weight, or at least 6.0% by weight. Item 30 concerns glass containing at least one of items 1 to 29, wherein the total amount of arsenic and antimony is less than 100 ppm. Item 31 concerns glass of at least one of items 1 to 30, wherein the total amount of lead and bismuth is less than 100 ppm. Item 32 pertains to glasses containing at least one of items 1 to 31, wherein (A) the most abundant alkali metal oxide is Na. 2O, the second most abundant alkali metal oxide (if present) system K 2O, and the third most abundant alkali metal oxide (if present) system Li 2O; or (B) the most abundant alkali metal oxide system K 2O, the second most abundant alkali metal oxide (if present) is Na 2O, and the third most abundant alkali metal oxide (if present) system Li 2O. Item 33 relates to glass of at least one of items 1 to 32, wherein the amount of alkaline earth metal oxide R'O is less than 10.0% by weight, less than 6.0% by weight, less than 4.0% by weight, or less than 2.0% by weight. Item 34 relates to glass of at least one of items 1 to 33, wherein the glass composition exhibits one or more of the following: a temperature T of at least 1040°C, at least 1090°C, at least 1140°C, at least 1190°C, at least 1200°C, or at least 1250°C. 4. Temperature T of at least 1180°C, at least 1240°C, at least 1300°C, at least 1350°C, at least 1400°C, or at least 1450°C. 3. VFT constant A with ˙ < 0.00, ranging from -4.00 to -2.00 as appropriate; VFT constant B with ˙ > 5,000℃, ranging from 6,000℃ to 8,000℃ as appropriate; and VFT constant T with ˙ 150 to 550℃, such as 200 to 400℃ or up to 355℃. 0. Item 35 concerns glass containing at least one of items 1 to 34, wherein (a) the total content of all alkaline earth metal oxides R'O by weight percentage relative to (b) SiO 2. The ratio of the content by weight percentage is from 0.0 to <0.06, <0.05, <0.04, <0.03, <0.02 or <0.01. Item 36 concerns glass of at least one of items 1 to 35, wherein (a) all alkali metal oxides R The total content of 2O by weight percentage relative to (b) SiO 2. The ratio of the content by weight percentage is from 0.0 to <0.37, <0.35, <0.30 or <0.28. Item 37 concerns glass containing at least one of items 1 to 36, wherein (a) ZrO 2 and Y 2O 3. The total content by weight percentage for (b) SiO 2. The ratio of the content by weight percentage is 0.08 to 0.40, 0.10 to 0.35 or 0.19 to 0.25. Item 38 concerns glass containing at least one of items 1 to 37, wherein (a) ZrO 2 and Y 2O 3. The total content by weight percentage relative to (b)Al 2O 3 and B 2O 3. The ratio of the sum of the contents by weight percentage is 0.30 to 2.00, 0.35 to 1.80 or 0.65 to 1.25. Item 39 concerns glass that contains at least one of items 1 through 38, wherein Al 2O 3 and ZrO 2. The total content by weight percentage is 10.0 to 30.0, 15.0 to 28.0 or 22.0 to 26.0. Item 40 pertains to glass containing at least one of items 1 through 39, characterized by its temperature T. 4 and T 7.6 The difference between them is the steepness of their temperature-viscosity curves for 250 to 400 K, 265 to 380 K, or 280 to 360 K. Article 41 relates to a glass comprising at least one of the first to forty items, the glass having at least 6.8% by weight, or at least 7.5% by weight, ZrO. 2. Quantity. Item 42 relates to glass of at least one of items 1 to 41, wherein the glass has a ZrO content of at least 0.30 or at least 0.45% by weight. 2 quantities relative to Al 2O The ratio of the three quantities. Item 43 relates to a glass comprising at least one of items 1 to 42, wherein the glass has a thickness of at least 10 μm. 2 / h, at least 14μm 2 / h, or at least 18μm 2 / h diffusion rate. Item 44 relates to a glass of at least one of items 1 to 43, wherein the glass has a thickness of at most 80 μm. 2 / h, up to 70μm 2 / h, or at most 60μm 2 / h diffusion rate. Item 45 relates to glass of at least one of items 1 to 44, wherein the definition of CSS is at least 600 MPa, at least 700 MPa, or at least 800 MPa. 30μm Fractional compressive stress susceptibility. Item 46 relates to a glass comprising at least one of items 1 to 45, wherein the glass has all of the following properties: - at least 6.8% by weight of ZrO 2. Quantity - at least 600 MPa is defined as CSS 30μm Fractional compressive stress susceptibility, - at least 0.45% by weight of ZrO 2 quantities relative to Al 2O The ratio of the three quantities. Item 47 relates to a glass comprising at least one of items 1 to 46, wherein the glass has all of the following properties: - at least 6.8% by weight of ZrO 2. Amount - at least 18μm 2 The diffusivity per h is - at least 0.45% by weight of ZrO. 2 quantities relative to Al 2O The ratio of the three quantities. Item 48 relates to a glass comprising at least one of items 1 to 47, wherein the glass has all of the following properties: - at least 6.8% by weight of ZrO 2. Quantity: - Less than 60 minutes at 1000 MPa IOX; - At least 0.45% ZrO by weight. 2 quantities relative to Al 2O The ratio of the three quantities. Item 49 relates to glass of at least one of items 1 to 48, wherein the glass comprises one or more of the following: - at least 1.0% by weight, such as 1.0 to 8.0% by weight of P 2O 5. Amount; - 0.5 to 5.0 wt% ZnO, - at least 1.0 wt% K 2O amount. - At least 1.0% by weight of MgO. Article 50 relates to a glass comprising the following components (by weight percentage). Where R The sum of the amounts of alkali metal oxides in the 2O series and the sum of the amounts of all alkaline earth metal oxides in the R'O series. Article 51 relates to the glass of Article 50, wherein the glass comprises the following components (by weight percentage). Item 52 relates to the glass described in Item 50 or Item 51, wherein the glass comprises the following components (in weight percentages). Among them Al 2O 3 and B 2O The total amount of 3 is 7.0 to 22.0% by weight, and of which (a) ZrO 2 and Y 2O 3. Content of SiO2 by weight percentage for (b) 2. The ratio of the content by weight percentage is 0.15 to 0.40. Item 53 relates to glass of at least one of items 50 to 52, wherein the glass comprises the following components (by weight percentage). ZrO by weight percentage 2 quantities relative to Al 2O The ratio of the three quantities should be at least 0.50. Item 54 relates to glass of at least one of items 50 to 53, wherein the glass comprises the following components (by weight percentage). Item 55 relates to glass of at least one of items 50 to 54, wherein the glass comprises the following components (by weight percentage). Item 56 relates to a glass of at least one of items 50 to 55, having a glass transition temperature T of at least 590°C, at least 610°C, or at least 625°C. g . Item 57 concerns glass of at least one of items 50 to 56, having a strength of at least 800 MPa, and, where applicable, at 100% KNO₃. The definition of CSS in 3 baths 200μm Fractional compressive stress susceptibility. Item 58 concerns glass of at least one of items 50 to 57, characterized by chemical resistance to one or more of the following: (a) a hydrolysis resistance value in μg / g sodium equivalent less than 100, less than 60, less than 40, or less than 30; (b) a chemical resistance value in mg / dm³. 2 The alkali resistance value of the loss-in-weight meter is less than 50, less than 40, less than 30, or less than 20; (c) in mg / dm³ 2 The acid resistance value of the loss-in-weight meter is less than 30, less than 20, less than 15, less than 10, or less than 5. Item 59 relates to a glass of at least one of items 50 to 58, having a compressive stress susceptibility of at least 35, at least 50, at least 60, or at least 80 MPa relative to the weight percentage of alkali metal oxide R. Total content of 2O and alkaline earth metal oxides R'O . Item 60 relates to glass of at least one of items 50 to 59, having a compressive stress susceptibility of at least 85, at least 100, at least 110, or at least 120 in MPa relative to a coefficient of thermal expansion in ppm / K over a temperature range of 20 to 300°C. . Article 61 relates to a glass of at least one of Articles 50 to 60, having a total content of less than 27.0% by weight of alkali metal oxides, alkaline earth metal oxides and ZnO. Item 62 relates to at least one of Items 50 to 61, wherein the weight percentage ratio of the second most abundant alkali metal oxide B to the most abundant alkali metal oxide A is less than 0.23, less than 0.22, or less than 0.18. Term 63 concerns the glass in term 62, where A = Na 2O and B = K 2O, or B = Na 2O and A = K 2O. Item 64 concerns glass of at least one of items 50 to 63, having a K value of less than 0.23, less than 0.22, or less than 0.18. The weight value of O relative to Li 2O and Na The ratio of the sum of the weight values ​​of 2O. Item 65 concerns glass of at least one of items 50 to 64, having a Na content of less than 0.23, less than 0.22, or less than 0.18. The weight value of O relative to Li 2O and K The ratio of the sum of the weight values ​​of 2O. Item 66 relates to glass of at least one of items 50 to 65, having a SiO₂ content of less than 5.5, less than 4.9, or less than 4.5. The weight value of 2 relative to Li 2O and Na The ratio of the sum of the weight values ​​of 2O. Item 67 relates to a glass comprising at least one of items 50 to 66, wherein the glass comprises at least 50.0% by weight or at least 55.0% by weight of SiO₂. 2, and / or - less than 3.0% by weight of K 2O. Item 68 concerns glass of at least one of items 50 to 67, wherein Al 2O 3 and B 2O The total content of 3 is less than 20.5% by weight, less than 18.0% by weight, or less than 17.0% by weight. Item 69 concerns glass of at least one of items 50 to 68, wherein Al 2O 3 and B 2O The total content of 3 is at least 5.0% by weight, at least 7.0% by weight, at least 8.5% by weight, or at least 10.5% by weight. Item 70 concerns glass of at least one of items 50 to 69, wherein all alkali metal oxides R The total content of 2O is less than 20.5% by weight, less than 19.5% by weight, or less than 18.5% by weight. Article 71 concerns the glass of at least one of Articles 50 to 70, wherein (a) the content of the second most abundant alkali metal oxide, by weight percentage, is related to (b) Al 2O 3 and B 2O 3. The ratio of the total content by weight percentage is 0.0 to 0.4, 0.0 to 0.3, or 0.0 to 0.2. Item 72 relates to a glass of at least one of Items 50 to 71, wherein the total content of MgO and the second most abundant alkali metal oxide is less than 8.0% by weight, less than 6.0% by weight, or less than 4.0% by weight. Item 73 relates to glass of at least one of items 50 to 72, wherein the glass comprises the following components (by weight percentage). Item 74 relates to glass of at least one of items 50 to 73, wherein the glass comprises the following components (by weight percentage). Item 75 relates to glass of at least one of items 50 to 74, wherein the glass comprises the following components (by weight percentage). Item 76 relates to glass of at least one of items 50 to 75, wherein the glass comprises the following components (by weight percentage). Item 77 concerns glass of at least one of items 50 to 76, wherein ZrO The amount of 2 is at least 4.5% by weight, at least 5.1% by weight, or at least 6.0% by weight. Item 78 concerns glass of at least one of items 50 to 77, wherein the total amount of arsenic and antimony is less than 100 ppm. Item 79 concerns glass of at least one of items 50 to 78, wherein the total amount of lead and bismuth is less than 100 ppm. Item 80 pertains to glass containing at least one of items 50 through 79, of which (A) the most abundant alkali metal oxide is Na. 2O, the second most abundant alkali metal oxide (if present) system K 2O, and the third most abundant alkali metal oxide (if present) system Li 2O; or (B) the most abundant alkali metal oxide system K 2O, the second most abundant alkali metal oxide (if present) is Na 2O, and the third most abundant alkali metal oxide (if present) system Li 2O. Article 81 relates to a glass of at least one of Articles 50 to 80, wherein the amount of alkaline earth metal oxide R'O is less than 10.0% by weight, less than 6.0% by weight, less than 4.0% by weight, or less than 2.0% by weight. Item 82 relates to at least one of Items 50 to 81, wherein the glass composition exhibits one or more of the following: a temperature T of at least 1040°C, at least 1090°C, at least 1140°C, at least 1190°C, at least 1200°C, or at least 1250°C. 4. Temperature T of at least 1180°C, at least 1240°C, at least 1300°C, at least 1350°C, at least 1400°C, or at least 1450°C. 3. VFT constant A with ˙ < 0.00, ranging from -4.00 to -2.00 as appropriate; VFT constant B with ˙ > 5,000℃, ranging from 6,000℃ to 8,000℃ as appropriate; and VFT constant T with ˙ 150 to 550℃, such as 200 to 400℃ or up to 355℃. 0. Item 83 concerns glass of at least one of items 50 to 82, wherein (a) the total content of all alkaline earth metal oxides R'O by weight percentage relative to (b) SiO 2. The ratio of the content by weight percentage is from 0.0 to <0.06, <0.05, <0.04, <0.03, <0.02 or <0.01. Item 84 concerns glass of at least one of Items 50 to 83, wherein (a) all alkali metal oxides R The total content of 2O by weight percentage relative to (b) SiO 2. The ratio of the content by weight percentage is from 0.0 to <0.37, <0.35, <0.30 or <0.28. Item 85 concerns glass of at least one of items 50 to 84, wherein (a) ZrO 2 and Y 2O 3. The total content by weight percentage for (b) SiO 2. The ratio of the content by weight percentage is 0.08 to 0.40, 0.10 to 0.35 or 0.19 to 0.25. Item 86 concerns glass of at least one of items 50 to 85, wherein (a) ZrO 2 and Y 2O 3. The total content by weight percentage relative to (b)Al 2O 3 and B 2O 3. The ratio of the sum of the contents by weight percentage is 0.30 to 2.00, 0.35 to 1.80 or 0.65 to 1.25. Item 87 concerns glass of at least one of items 50 to 86, wherein Al 2O 3 and ZrO 2. The total content by weight percentage is 10.0 to 30.0, 15.0 to 28.0 or 22.0 to 26.0. Item 88 concerns glass of at least one of items 50 to 87, characterized in that its temperature T 4 and T 7.6 The difference between them is the steepness of their temperature-viscosity curves for 250 to 400 K, 265 to 380 K, or 280 to 360 K. Item 89 relates to glass of at least one of items 50 to 88, wherein the glass has at least 6.8% by weight, or at least 7.5% by weight, ZrO. 2. Quantity. Item 90 relates to glass of at least one of items 50 to 89, wherein the glass has a ZrO content of at least 0.30 or at least 0.45% by weight. 2 quantities relative to Al 2O The ratio of the three quantities. Item 91 relates to a glass of at least one of items 50 to 90, the glass having a thickness of at least 10 μm. 2 / h, at least 14μm 2 / h, or at least 18μm 2 / h diffusion rate. Item 92 relates to at least one of items 50 to 91, the glass having a maximum thickness of 80 μm. 2 / h, up to 70μm 2 / h, or at most 60μm 2 / h diffusion rate. Item 93 concerns glass of at least one of items 50 to 92, wherein the definition of CSS is at least 600 MPa, at least 700 MPa, or at least 800 MPa. 30μm Fractional compressive stress susceptibility. Item 94 concerns a glass of at least one of Items 50 to 93, which has all of the following properties: - at least 6.8% by weight of ZrO 2. Quantity - at least 600 MPa is defined as CSS 30μm Fractional compressive stress susceptibility, - at least 0.45% by weight of ZrO 2 quantities relative to Al 2O The ratio of the three quantities. Item 95 concerns a glass of at least one of Items 50 to 94, which has all of the following properties: - at least 6.8% by weight of ZrO 2. Amount - at least 18μm 2 The diffusivity per h is - at least 0.45% by weight of ZrO. 2 quantities relative to Al 2O The ratio of the three quantities. Item 94 concerns a glass of at least one of Items 50 to 95, wherein the glass has all of the following properties: - at least 6.8% by weight of ZrO 2. Quantity: - Less than 60 minutes at 1000 MPa IOX; - At least 0.45% ZrO by weight. 2 quantities relative to Al 2O The ratio of the three quantities. Item 95 relates to glass of at least one of items 50 to 94, the glass comprising one or more of the following: - at least 1.0% by weight, such as 1.0 to 8.0% by weight of P 2O 5; - 0.5 to 5.0% by weight of ZnO, - at least 1.0% by weight of K 2O - At least 1.0% by weight of MgO. Item 96 concerns glass of at least one of items 50 to 95, having a density of less than 10.0 x 10⁻⁶ cm. -6 K -1 Less than 9.5*10 -6 K -1 Less than 9.2*10 -6 K -1 Less than 8.8*10 -6 K -1 Less than 8.5*10 -6 K -1 or less than 8.2*10 -6 K -1 Its coefficient of thermal expansion in the temperature range of 20 to 300℃. Item 97 relates to glass of at least one of Items 50 to 96, having a Young's modulus of at least 70 GPa, at least 74 GPa, at least 75 GPa, or at least 78 GPa. Item 98 relates to glass of at least one of items 50 to 97, having a Poisson's ratio of 0.220 to 0.260, 0.225 to 0.255, or 0.230 to 0.250. Item 99 concerns glass of at least one of items 50 to 98, having a time of 1000 MPa IOX for less than 60 minutes. Item 100 concerns glass of at least one of items 50 to 99, having a density of 2.530 to 2.800 g / cm³. 3 2.580 to 2.700 g / cm³ 3 Or 2.600 to 2.690 g / cm³ 3 The density. Article 101 relates to glass of at least one of Articles 50 to 100, wherein the glass comprises the following components (by weight percentage). Item 102 relates to glass of at least one of items 50 to 101, wherein the glass comprises the following components (by weight percentage). Item 103 relates to glass of at least one of items 50 to 102, wherein the glass comprises the following components (by weight percentage). Item 104 relates to glass of at least one of items 50 to 103, wherein the glass comprises the following components (by weight percentage). Item 105 relates to glass of at least one of items 50 to 104, wherein the glass comprises the following components (by weight percentage). Item 106 relates to a glass article having a thickness of 1,000 μm or less, and comprising or consisting of (A) glass according to any one of items 1 to 49, or (B) glass according to any one of items 50 to 105. Item 107 relates to a glass article according to Item 106, having a thickness of less than 1,000 μm, less than 850 μm, less than 300 μm, less than 200 μm, or less than 100 μm. Item 108 relates to a glass article according to Item 106 or 107, having a thickness of at least 5 μm, at least 10 μm, or at least 15 μm. Item 109 relates to a glass object according to any one of items 106 to 108, having a thickness of less than 80 μm, less than 60 μm, or less than 40 μm. Item 110 relates to a glass object according to at least one of items 106 to 109, having a warpage of less than 3.0 mm, less than 2.0 mm, or less than 1.0 mm. Item 111 relates to a glass object according to at least one of items 106 to 110, having a total thickness variation of less than 15 μm, less than 10 μm, or less than 5 μm. Item 112 relates to a glass object according to at least one of items 106 to 111, having a thickness of at least 10 cm. 2 At least 15 cm 2 Or at least 20 cm 2 The area of. Item 113 relates to a glass object according to at least one of items 106 to 112, having a diameter of less than 10,000 cm. 2 Less than 1,000 cm 2 or less than 200 cm 2 The area of. Item 114 relates to a glass object according to at least one of items 106 to 113, having a surface roughness R of not more than 5.0 nm, not more than 3.0 nm, or not more than 1.5 nm on one or two of its main surfaces. a . Article 115 relates to a glass article according to at least one of Articles 106 to 114, which has chemical resistance on one or two of its main surfaces characterized by one or more of the following: (a) a hydrolysis resistance value in μg / g sodium equivalent less than 100, less than 60, less than 40, or less than 30; (b) a chemical resistance value in mg / dm³. 2 The alkali resistance value of the loss-in-weight meter is less than 50, less than 40, less than 30, or less than 20; (c) in mg / dm³ 2 The acid resistance value of the loss-in-weight meter is less than 30, less than 20, less than 15, less than 10, or less than 5. Item 116 relates to a glass object according to at least one of items 106 to 115, having a Vickers hardness of at least 580, at least 590, or at least 600. Item 117 relates to a glass object according to at least one of items 106 to 116, which exhibits a three-point bending strength of at least 100 MPa, at least 200 MPa, or at least 300 MPa. Item 118 relates to a glass object according to at least one of items 106 to 117, having - a thickness of less than 100 μm, - a glass having a strength of at least 600 MPa as defined in CSS. 30μm Fractional compressive stress susceptibility, - composition of the following components (by weight percentage) Item 119 relates to a glass article according to at least one of items 106 to 118, having - a thickness of less than 100 μm, - a glass thickness of at least 18 μm. 2 / h diffusivity, - composition of the following components (by weight percentage) Article 120 relates to a glass article according to at least one of Articles 106 to 119, which contains an ion exchange layer on one or both of its main surfaces. Article 121 relates to a glass article according to Article 120, which has a compressive stress of at least 400 MPa, at least 700 MPa, at least 800 MPa or at least 900 MPa on one or two of its main surfaces. Item 122 relates to a glass object according to Item 120 or Item 121, wherein the ratio of a compressive stress in MPa to the object thickness in μm is at least 4.0, at least 5.0 or at least 6.0 on one or two of its main surfaces. Item 123 relates to a glass article according to at least one of items 120 to 122, wherein the ratio of a compressive stress in MPa to an ion exchange layer depth in μm is at least 50, at least 75, or at least 90 on one or two of its main surfaces. Item 124 relates to a glass object according to at least one of Items 120 to 123, which exhibits a three-point bending strength of at least 400 MPa, at least 500 MPa, or at least 600 MPa. Article 125 relates to a glass object according to at least one of Articles 120 to 124, having a thickness of 20 to 40 μm, such as 25 to 35 μm, and a compressive stress of at least 800 MPa, at least 850 MPa, or at least 900 MPa on one or both of its main surfaces. Item 126 relates to a glass object according to at least one of items 120 to 125, having a DoL of 6 to 12 μm or 7 to 11 μm on one or both of its main surfaces. Item 127 relates to a glass article according to at least one of items 120 to 126, having a DoL of at least 6 μm, at least 7 μm, or at least 8 μm. Item 128 relates to a glass article according to at least one of items 120 to 127, having a DoL of at most 15 μm, at most 13 μm, at most 12 μm or at most 11 μm. Item 129 relates to a glass object according to at least one of items 120 to 128, having a DoL of 15% to 25% of the object thickness or 16% to 20% of the object thickness. Item 130 relates to a glass object according to at least one of items 120 to 129, having a DoL of at least 15% of the object thickness, at least 16% of the object thickness, or at least 17% of the object thickness. Article 131 relates to a glass article according to at least one of Articles 120 to 130, having a thickness of at most 33%, at most 25%, or at most 20% DoL. Article 132 relates to a glass article according to at least one of Articles 120 to 131, having a thickness of less than 100 μm, and a composition of the following components (by weight percentage). Article 133 relates to a glass article according to at least one of Articles 120 to 132, having a thickness of less than 80 μm, and a composition of the following components (by weight percentage). Item 134 relates to a glass article according to at least one of items 120 to 133, having a thickness of less than 60 μm, and a composition of the following components (by weight percentage). Article 135 relates to a glass article according to at least one of Articles 120 to 134, having a thickness of less than 80 μm, a DoL of 6 to 12 μm, and a composition of the following components (by weight percentage). Item 136 relates to an electronic device comprising (A) glass according to any one of items 1 to 49, (B) glass according to any one of items 50 to 105, (C) a glass article according to any one of items 106 to 119, and / or (D) a glass article according to items 120 to 135. Item 137 relates to an electronic device according to Item 136, which includes a display comprising (A) glass according to any one of Items 1 to 49, (B) glass according to any one of Items 50 to 105, (C) a glass article according to any one of Items 106 to 119, and / or (D) a glass article according to Items 120 to 135. Item 138 relates to an electronic device pursuant to Item 136 or 137, wherein the electronic device is a foldable device, such as a foldable smartphone or tablet computer. Item 139 relates to a glass comprising the following components (by weight percentage). R'O represents the sum of all alkaline earth metal oxides. Item 140 concerns glass pursuant to Item 139, wherein ZrO The amount of 2 is at least 5.0 by weight. Item 141 concerns glass according to Item 139, wherein ZrO The amount of 2 is at least 5.1% by weight. Item 142 relates to glass according to at least one of Items 139 to 141, wherein the glass does not contain BaO. Article 143 relates to a glass according to at least one of articles 139 to 142, wherein the glass contains up to 64.0% by weight of SiO₂. 2. Item 144 concerns glass according to at least one of items 139 to 143, wherein (a) ZrO 2 and Y 2O 3. The total content by weight percentage for (b) SiO 2. The ratio of the content by weight percentage is at least 0.08. Item 145 concerns glass according to at least one of items 139 to 144, wherein (a) ZrO 2 and Y 2O 3. The total content by weight percentage relative to (b)Al 2O 3 and B 2O 3. The ratio of the sum of the contents by weight percentage is at least 0.30. Article 146 relates to a glass according to at least one of Articles 139 to 145, wherein the glass contains at least 0.5% by weight of MgO. Item 147 relates to glass according to at least one of items 139 to 146, wherein when the glass is heat-treated in a gradient furnace with an elevated temperature scheme for 16 hours, at 10 5 The crystal growth rate at dPas viscosity is at most 0.5 μm / min. Item 148 concerns glass according to at least one of items 139 to 147, wherein Li The amount of 2O is at most 0.5 by weight. Item 149 relates to glass according to at least one of Items 139 to 148, wherein the sum of R'O + ZnO is not greater than 13.0 by weight. Item 150 concerns glass according to at least one of items 139 to 149, wherein Al 2O The content of 3 ranges from 5.0 to 16.0 by weight. Examples of glass compositions according to the invention are prepared by melting suitable glass raw materials. The following table provides an overview of the composition and properties of such glasses. 1. Components to be detected surface 1 surface 2 2. Ion exchange treatment: Glass sheets were prepared from compositions 1 to 4 and 6 to 8. The sheet thickness was 200 μm. Subsequently, the sheets were subjected to 100% KNO3 at 440 °C. 3. Ion exchange treatment was performed in a salt bath for 30 minutes. The table below lists the resulting compressive stress and the depth of the ion exchange layer (DoL). surface 3 3. Mechanical Testing: The hardness and three-point bending (3PB) strength of the objects having compositions 1 and 2 were tested. Vickers hardness testing was performed on the objects without ion exchange layers. The three-point bending test was conducted on both non-ion exchanged objects and glass objects having the compositions of Example 1 (CS = 1239 MPa, DoL = 10.0 μm) and Example 2 (CS = 1431 MPa, DoL = 14.6 μm) with compressive stress (for 200 μm thick glass, respectively). The results are shown below. surface 4 4. Other Components The following components are within the scope of this disclosure. The sum of the components in the table may be slightly higher or lower than 100%, which may be the result of rounding. No clarifying agents, such as 0.1% SnO, are indicated in the table below. 2 and 0.2% Cl. surface 5 surface 6 surface 7 surface 8 5. Chemical resistance and hydrolysis resistance were tested according to ISO 719. Alkali resistance was measured according to ISO 695, and acid resistance was tested according to DIN 12116. The results are shown in the table below. surface 9 6. Other tested components were prepared by melting suitable glass raw materials to produce other exemplary glass compositions. The following table provides an overview of the compositions and properties of these glasses. surface 10 surface 11 surface 12 7. Ion exchange treatment: Glass sheets were prepared from compositions 9 to 11, 28, 30 to 35, 37 to 40, and 42 to 49. The sheet thickness was 200 μm. Subsequently, the sheets were subjected to 100% KNO3 at 440 °C. 3. Ion exchange treatment was performed in a salt bath for 30 minutes. The table below lists the resulting compressive stress and the depth of the ion exchange layer (DoL). surface 13 surface 14 surface 15 8. Mechanical Testing: The three-point bending (3PB) strength of objects with components 1, 3, 4, 6 to 11, 28, 30, 32 to 35, 37, 38, and 40 was tested. The three-point bending test was performed using ion exchange objects with compressive stresses and DoL as indicated in the table below. The object thickness was 500 μm. The results are shown in the table below. surface 16 surface 17 surface 18 9. Devitrification for compositions 1, 5, 7, 34, 37, 40 to 44, 46, 48 and 49, at 10 5 Devitrification resistance is determined by the crystal growth rate (in μm / min) at a viscosity of dPas. A lower crystal growth rate results in higher devitrification resistance. The measurement of crystal growth rate is well-known. The crystal growth rate is measured along the formed crystal, specifically at its maximum extension. In short, the crystal growth rate was determined by heat-treating the glass for 16 hours in a gradient furnace with an increasing temperature scheme. Importantly, if at 10... 5 If no devitrification occurs at the viscosity of dPas, then it is impossible to determine the viscosity at 10... 5 Crystal growth rate at dPas. No devitrification can also be expressed as crystal growth rate at 10 dPas. 5 The crystal growth rate under dPas was 0 μm / min. The crystallization rate was determined using glass particles with a diameter of approximately 2 to 3 mm. The glass particles were placed on a platinum support used for gradient tempering. The support had recesses for receiving the glass particles and holes at the bottom of each recess for optical detection, allowing for the determination of the crystal growth rate by microscopy. Each recess had a diameter of 2 mm, and each hole had a diameter of 0.9 mm. The results are shown in the table below.

Claims

1. A glass comprising i. SiO2, ii. 5.0 to 25.0% by weight of Al2O3 and / or B2O3, iii. at least 3.0% by weight of ZrO2 and / or Y2O3, wherein the amount of ZrO2 is at least 4.5% by weight, iv. 10.0 to 40.0% by weight of one or more oxides selected from the group consisting of ZnO, Li2O, Na2O, K2O, MgO, CaO, SrO, BaO, and combinations thereof, and v. a total amount of not more than 15.0% by weight of alkaline earth metal oxides and ZnO, wherein... The glass contains alkali metal oxides, and Li2O is not the most abundant alkali metal oxide.

2. The glass of claim 1 has a coefficient of thermal expansion of less than 10.0*10-6 K-1 in the temperature range of 20 to 300°C.

3. The glass of claim 1 or 2, comprising at least 50.0% by weight of SiO2 and / or less than 3.0% by weight of K2O.

4. The glass of claim 1 or 2 has a compressive stress susceptibility of at least 800 MPa, defined as a CSS 30 μm fraction.

5. The glass as requested in item 1 or 2, wherein, The amount of ZrO2 is at least 6.8 by weight.

6. The glass as requested in item 1 or 2, wherein, The ratio of ZrO2 to Al2O3 by weight percentage is at least 0.

30.

7. The glass of claim 1 or 2, having at least one of the following: a 1000 MPa 10X time of less than 60 minutes, a glass transition temperature Tg of at least 590°C, a steepness of its temperature-viscosity curve with a temperature difference of 250 to 400 K between T4 and T7.6, and a diffusivity of at least 10 μm² / h.

8. The glass as requested in item 1 or 2, wherein, When glass is heat-treated in a gradient furnace with an elevated temperature scheme for 16 hours, the crystal growth rate at a viscosity of 105 dPas is at most 0.5 μm / min.

9. A glass article comprising or composed of any one of claims 1 to 8.

10. The glass object as claimed in claim 9 has a thickness of less than 100 μm.

11. The glass article of claim 9 or 10, which contains an ion exchange layer on one or both of its main surfaces.

12. A glass object as claimed in claim 11, having a compressive stress of at least 400 MPa on one or both of its main surfaces.

13. The glass object of claim 11, having on one or both of its main surfaces a ratio of compressive stress in MPa to object thickness in μm of at least 4.0, and / or a ratio of compressive stress in MPa to ion exchange layer depth in μm of at least 50.

14. An electronic device comprising the glass of any one of claims 1 to 8, and / or the glass object of any one of claims 9 to 13.