SCRATCH REMOVER FOR GLASS

Description

Technical area

[0001] The present invention relates to the use of a kit for removing scratches from glass surfaces. Specifically, the invention relates to the use of a kit for removing scratches from tempered glass surfaces, such as car glass, watch glass, or display covers of mobile devices (e.g., smartphones and tablets). Related prior art

[0002] Every owner of mobile phones (glass displays), cars (car glass), watches (watch glass), glass furniture, decorative items, window glass, etc., knows the problem: Almost every glass surface gets scratched sooner or later. Even so-called micro-scratches, which cannot be recognized as scratches with the naked eye, can lead to, for example, the glass becoming cloudy or dull. Such micro-scratches can occur even on extremely hard glass, such as that used in mobile phone and tablet displays, due to constant wear and tear.

[0003] Scratches of any kind not only limit the appearance but often also the function of the object or device.

[0004] The problem is also independent of the type of glass, the quality of the glass, and the manufacturer. Annoying scratches on mobile phone displays, for example, limit the view of the display and often also make touchscreen operation unpleasant.

[0005] As a result, unsightly scratches significantly reduce the usability and market value (resale value) of the scratched items. Repairs or restorations were previously virtually impossible, especially for mobile phones or watches with very hard glass. For replaceable components, the only option was to have the scratched display (e.g., in electronic devices such as mobile phones) or the entire glass (e.g., in cars or watches, etc.) replaced by a specialist. However, this is not only very expensive and time-consuming, but also neither environmentally friendly nor sustainable nor resource-efficient.

[0006] CN 105538076 A describes a polishing process for glass with a polishing paste using polishing wheels. Summary of the invention

[0007] The aim of the invention is to remove scratches from glass surfaces. Specifically, it is intended to create a method for removing scratches regardless of the glass quality (or the glass manufacturer). This is intended to preserve the appearance, function, and, not least, the value of the respective objects. Furthermore, the invention aims to eliminate the need for expensive replacement of components such as display glass or watch crystals due to scratches, thus opening up significant savings potential and promoting resource conservation and sustainability.

[0008] These objects are achieved by a use defined in the claims. Detailed description of the invention

[0009] Specifically, the use of the kit according to the present invention enables an end user to remove scratches from glass surfaces without the aid of additional tools.

[0010] The present invention relates to the use of a set for removing scratches from a glass surface, the set comprising a polishing paste containing abrasive particles and a polishing rod in the form of a spatula (hereinafter also referred to as a "spatula-like polishing tool").

[0011] The present invention enables scratch removal from known glass qualities from all manufacturers. The invention can be applied, for example, to extremely hard and flexible tempered glass, such as that offered under the brands Gorilla Glass (CORNING), DRAGONTRAIL (Asahi Glass), and XENSATION COVER (Schott), as well as to mineral and sapphire glass (watches), automotive glass / safety glass (cars), and regular glass from any manufacturer (windows, furniture, glass objects). The invention is also suitable for glass ceramics, such as ceramic hobs, and bulletproof glass, such as that used in shop windows.

[0012] The combination of polishing paste and polishing rod is particularly important for the invention. One aspect of the present invention is the manual polishing of glass surfaces, i.e., polishing using only muscle power without the aid of expensive motor-driven tools. Likewise, no other tool (that comes into contact with the glass surface) should preferably be used besides the polishing rod (the spatula-like polishing tool), which is optionally partially covered with a fabric and can optionally be clamped in a holder.

[0013] Tests have shown that the polishing effect of the polishing paste is significantly lower when only a cloth or rag is used as a polishing aid. This is even more true the harder the surface to be polished. Although the invention is not limited to the following theory, it is assumed that cloths (e.g. a microfiber cloth) cannot exert sufficient pressure on the abrasive particles. In particular, small abrasive particles are pressed into the material and can therefore no longer exert their sufficient polishing effect. The use of the significantly harder polishing rod in the form of a spatula now leads to the abrasive particles only partially penetrating the polishing tool and, when enriched, possibly forming a grinding or polishing surface there. In any case, when the polishing tool of the invention is used, the polishing effect of the abrasive particles in the polishing paste is retained.This means that even fine scratches can be removed from extremely hard glass.

[0014] The polishing rod in the form of a spatula (also called a polishing aid), which can also be referred to as a spatula-like polishing tool, is not particularly limited as long as the polishing paste is distributed over the glass surface. The shape of a spatula (a flattened cuboid) is ideal, at least on the polishing side of the tool. The simplest form of such a polishing rod is a cuboid, as shown in Fig. 1 shown, whereby the edges can also be rounded or bevelled.

[0015] A polishing surface bevelled at an angle (β) of approximately 45° (e.g. in a range of 20° to 70°, preferably 30° to 60°, or 40° to 50°) to the longitudinal direction of the polishing tool has proven to be ergonomically advantageous (cf. Fig. 2A , perspective, and Fig. 2B Front view of the Fig. 2AThis optimally combines both the normal force for the required polishing pressure and the transverse force for the polishing movement, preventing chatter marks. The bevel can also be present at both ends of the polishing tool to allow use with two polishing pastes with different grits.

[0016] The polishing tool preferably has dimensions that allow the tool to be operated with one hand and to exert sufficient pressure during polishing.

[0017] For example, in the case of a cuboid-shaped (or approximately cuboid-shaped) polishing tool, its length (L) is preferably 2 to 35 cm. For easier handling, the length should preferably be at least 3 cm, at least 4 cm, at least 5 cm, at least 6 cm, at least 7 cm, at least 9 cm, at least 10 cm, or at least 11 cm. Likewise, the length should preferably be at most 30 cm, at most 28 cm, at most 26 cm, at most 25 cm, at most 24 cm, at most 23 cm, at most 22 cm, or at most 21 cm. The length is particularly preferably in a range from 11 to 22 cm, even more preferably in a range from 13 to 17 cm.

[0018] The width (B) should be at most 2.5 cm, at most 2.0 cm, at most 1.5 cm, or at most 1.0 cm. Likewise, the width should preferably be at least 0.3 cm, at least 0.4 cm, at least 0.5 cm, at least 0.6 cm, or at least 0.7 cm. The width is particularly preferably in the range of 0.5 to 1.5 cm.

[0019] The depth (T) or thickness (the shortest side) should preferably be at most 1.50 cm, at most 1.30 cm, at most 1.20 cm, at most 1.10 cm, at most 1.00 cm, or at most 0.90 cm. Likewise, the thickness should preferably be at least 0.10 cm, at least 0.15 cm, at least 0.20 cm, at least 0.30 cm, at least 0.40 cm, or at least 0.45 cm. The thickness is particularly preferably in a range from 0.20 to 1.00 cm.

[0020] The polishing tool preferably has an aspect ratio (L / T) of length (L) to thickness (T) of at least 6, preferably at least 8, at least 10, at least 15, at least 20 or at least 25. This aspect ratio (L / T) is preferably 100 or less, 90 or less, 80 or less or 70 or less.

[0021] The aspect ratio (W / T) of the width (W) to the thickness (T) is preferably 1.3 or more, 1.5 or more, 1.7 or more, 1.9 or more, 2.0 or more, 2.1 or more, or 2.2 or more. This aspect ratio (W / T) is preferably 5.0 or less, 4.0 or less, 3.5 or less, 3.2 or less, or 3.0 or less.

[0022] For non-cuboid (or nearly cuboid) polishing tools, these dimensions are also preferred, where the length refers to the longest dimension of the tool, the thickness refers to the material thickness of the tool near (at 0.3 cm distance) to the end used for polishing, and the width refers to the dimension (at the end used for polishing) in the direction that is perpendicular (vertical) to both the direction of the length and the direction of the thickness.

[0023] The abrasive bodies are preferably made of a material having a Mohs hardness of 5.5 or more, 7.0 or more, 8.0 or more, 9.0 or more, particularly preferably 9.2 or more, 9.5 or more, 9.8 or more, 9.9 or more, or more than 9.9. Particularly for polishing toughened glass, the Mohs hardness is preferably 9.5 or more, 9.8 or more, particularly preferably 10.0. The Mohs hardness is particularly preferably in the range from 9.0 to 10.0.

[0024] The abrasive bodies are preferably made of a material selected from the group consisting of diamond, aluminum oxide (Al2O3), boron carbide, silicon carbide, cerium oxide, and boron nitride. Although the hardness and thus the material can be appropriately selected depending on the application of the invention, it is preferred to use diamond as the material of the abrasive bodies to ensure a wide range of applications, even without knowledge of the material to be polished.

[0025] The diamond is preferably synthetic diamond. The diamond can also be monocrystalline diamond or polycrystalline diamond, preferably polycrystalline diamond. Polycrystalline diamond exhibits better polishing results in the present invention. The following is assumed to be the reason for this: Monocrystalline industrial diamond, which is relatively inexpensive and can be produced in large quantities, has a monocrystalline lattice structure. The slip planes are parallel to one another. Under stress (e.g., during polishing), the monocrystalline diamond grain breaks along the parallel cleavage planes. This creates blocky grains with sharp cutting edges. However, even a single break can halve the grain size.

[0026] A polycrystalline industrial diamond (PCD), on the other hand, is composed of numerous tiny diamond grains (usually on the order of nanometers). Under stress, small corners and edges break away from the diamond grain, continually creating new, sharp cutting edges (self-sharpening effect). Thanks to this unique characteristic, high removal rates (polishing rates) are possible over extended periods. PCD is therefore ideally suited for polishing extremely hard materials such as sapphire glass, ceramics, and even GORILLA GLAS (brand name).

[0027] The polishing tool is preferably made of wood or plastic. Both wood and plastic are available in various hardnesses. The hardness of the polishing tool allows for fine-tuning of the polishing effect.

[0028] Depending on the hardness of the contact surface of the polishing tool, the polishing effect of the polishing rod and polishing paste combination can be adjusted. Here, too, it is reasonable to assume that the polishing effect of the abrasives is more cushioned in soft materials (because they penetrate deeper into the material) and correspondingly less so in hard wood. Furthermore, softer polishing tools presumably reduce the "rolling motion" of the abrasives (or polishing stones) that is typical of the lapping process, making a typical lapping process more like a typical polishing process. The following polishing gradations can be represented: Soft / mild: soft polishing rod - monocrystalline diamond. Hard / sharp: hard polishing rod - polycrystalline diamond.

[0029] In the case of wood, a distinction is usually made between soft woods (usually with a Brinell hardness (across the grain; 12% moisture) of 20 or less; e.g., linden (16), spruce (12), fir (16), Douglas fir, pine (19), larch (19), balsa (2), alder (12), linden (16), poplar (10), whereby in the invention the hardness should be at least 10), hard or medium-hard woods (usually with a Brinell hardness between 20 and 30, e.g., birch (22 to 30, depending on the species), elm or elm (30)) and hard woods or very hard woods (usually with a Brinell hardness of at least 30, e.g., yew (30), bankirai (63), ash (38), cherry (31), robinia (46), teak (≥30), bamboo (40), Olive (51), Wenge (44), Azobé (78), Beech (34), Ebony (84), Oak (34), Hornbeam (34)).

[0030] For the polishing tool in the present invention, hard (medium-hard) woods and hard (very hard) woods are preferably used, preferably birch or beech, preferably birch. For a fine polish (to remove even the last scratches), a soft wood, preferably spruce, pine, or linden, preferably linden, can be used, particularly in a multi-stage polishing process, in the final step. If plastics are used, they can be categorized according to their hardness according to the different wood species and used accordingly.

[0031] The abrasive bodies preferably have an average particle size D50 (by volume) in a range of 0.05 to 25.0 µm. The range is particularly preferably 0.10 to 15.0 µm, 0.10 to 12.0 µm, 0.10 to 10.0 µm, 0.10 to 8.0 µm, 0.10 to 6.0 µm, or 0.10 to 4.0 µm. The average particle size is preferably at least 0.2 µm, at least 0.3 µm, at least 0.4 µm, or at least 0.5 µm to ensure a good polishing effect (within a reasonable time).

[0032] Of course, the grain size (average particle size D50) of the abrasive also plays a significant role in the polishing effect. For example, diamond powder with a grain size (average particle size) of >6 µm can cause micro-scratches in Gorilla Glass itself, causing the surface to become dull. Even coarser diamond powders >25 µm can cause visible scratches even in Gorilla Glass.

[0033] Therefore, a grain size of significantly less than 6 µm is preferably used for scratch removal, at least in the final step. Better and, above all, faster results are achieved, however, if the polishing is carried out in several stages (at least two stages). In this case, the grain size can be gradually increased from coarse (e.g., 6.0–25.0 µm, preferably 6.0–10.0 µm) through medium grain(s) (e.g., 1.0–6.0 µm; 1.0–3.0 µm; 1.5–2.5 µm) to fine (e.g., 0.2–1.0 µm). The coarse grain and / or one or more of the medium grains can also be omitted. Particularly preferably, the polishing is carried out in several stages (e.g. two stages), wherein at least one polishing process is carried out with a medium particle size of the polishing bodies (e.g. D50 in the range 1.0 - 6.0 µm, 1.0 - 3.0 µm, or 1.5 - 2.5 µm) and at least one polishing process is carried out with a fine particle size (e.g. D50 in the range of 0.2 - 1.0 µm, 0.4 - 1.0 µm, 0.5 - 1.0 µm, or 0.6 - 0.9 µm).

[0034] The particle size distribution of the polishing particles is preferably narrow. In particular, the amount of particles with particularly large particle sizes should be low. The D99 value is therefore preferably at most 2.5 times the D50 value, particularly preferably at most 2.3 times, 2.2 times, or 2.1 times.

[0035] Thus, in the invention, the set preferably comprises, in addition to the polishing paste (then referred to as first polishing paste), a second polishing paste containing second abrasive bodies, wherein the second abrasive bodies have a smaller average particle size (D50) than the abrasive bodies of the first polishing paste (then referred to as first abrasive bodies).

[0036] The second abrasive bodies preferably have an average particle size of at most 70%, preferably at most 50%, at most 45%, or at most 40% of the average particle size of the first abrasive bodies. Preferably, it is 20% or more, likewise preferably 25% or more. Appropriate grading can avoid unnecessary processing steps.

[0037] Specifically in a polishing process with exactly two pastes, the average particle size of the first abrasive bodies is preferably in a range from 1.0 to 6.0 µm, particularly preferably 1.3 to 3.0 µm, and the average particle size of the second abrasive bodies is preferably in a range from 0.1 to 1.5 µm, particularly preferably 0.5 to 1.2 µm. In this way, visible scratches can be effectively removed together with a fine polish to remove micro-scratches using just two polishing pastes. In this case, it is preferable to use an additional polishing tool in a further work step (preferably the last polishing step) which has a lower hardness than the first polishing tool. In this way, a finely polished surface can be created.

[0038] Furthermore, the set preferably contains, in addition to the polishing tool (then referred to as the first polishing tool), a second spatula-like polishing tool, wherein the second polishing tool may have a lower hardness (e.g., made of a soft material or wood, such as linden wood) than the first polishing tool (e.g., made of a hard or medium-hard material or wood, such as birch wood). The preferred shapes and dimensions of the second polishing tool preferably correspond to the preferred shapes and dimensions of the first polishing tool described above.

[0039] Alternatively, the first (or only) polishing tool can be used in a two- or multi-stage polishing process in such a way that at least for the last polishing step the previously unused side is used and / or the polishing tool is ground down before at least the last polishing step. For this purpose, the set can include a grinding tool (e.g., sandpaper). "Abduction" of coarse abrasives into a polishing step with fine abrasives can be prevented.

[0040] The set preferably further includes a piece of cloth, preferably a cloth with very fine fibers (microfiber cloth). The piece of cloth (or cloth) can be attached to the end of the polishing tool that comes into contact with the glass surface during polishing. The cloth can be, for example, a woven or nonwoven fabric. It has been shown that the polishing effect is not impaired by a suitable cloth. In fact, the cloth can largely prevent the polishing paste from being pushed away. The cloth essentially absorbs the polishing paste and continuously supplies the end of the polishing tool with polishing paste. This not only saves time (since the paste does not have to be pushed back into the working area), but also allows for more even polishing. The polishing cloth should be as thin as possible (e.g.,0.1 - 1.0 mm, preferably 0.3 - 0.5 mm) and have as little spring effect as possible to ensure optimal force transfer to the surface. Furthermore, polishing with the piece of cloth can be carried out using significantly less polishing paste and is therefore much more economical. Furthermore, it has been found that when using such a polishing cloth, the hardness of the polishing tool and its material (wood or plastic) only play a minor role. Therefore, when using a polishing cloth, several (or even all) polishing steps can be carried out using just one polishing aid (or several polishing aids made of the same material) without affecting the result. By using a polishing cloth for each of the pastes, contamination of the finer pastes with the larger abrasives of the coarser pastes and thus new scratches during fine polishing can be avoided.

[0041] When using a polishing cloth in a multi-step polishing process, the cloth should be changed after each polishing step, or at least before the last polishing step (or, in the case of an elongated cloth, the polishing point should be changed). In this case, grinding the polishing tool (or replacing or changing the polishing side) can be omitted, as the coarse abrasive grains from previous polishing steps are not negatively affected by the cloth.

[0042] To quickly and easily change (or move) the polishing cloth, it is preferably temporarily attached to the polishing tool. For example, the cloth is placed over the polishing tip (or polishing end) of the tool so that the entire polishing surface is covered with the cloth. The cloth is then preferably attached to a further back (or central) part of the polishing tool. This can be done, for example, with a simple clamp (e.g. made of metal or plastic, such as a paper clip or a clip) or, preferably, with a rubber band (rubber ring). The set therefore preferably contains a clamp or a rubber band (rubber ring) for attaching the cloth to the polishing tool.

[0043] If there are several cloths in the set, they are preferably marked (e.g. by color) to prevent confusion, even if the polishing process is interrupted or several polishing steps are carried out.

[0044] The composition of the grinding pastes (or polishing pastes) is not particularly limited. Preferred particle sizes of the abrasive particles (or polishing particles) have already been discussed above. The pastes preferably have a proportion of abrasive particles in a range of 5 to 50 wt.%, preferably at least 10 wt.%, at least 15 wt.%, at least 20 wt.%, or at least 25 wt.%, likewise preferably at most 45 wt.% or at most 40 wt.%.

[0045] The pastes preferably have a composition (especially a viscosity) that prevents rapid settling of the abrasive particles. This can be achieved in several ways. For example, oil- or wax-based compositions can be used which, in addition to the abrasive particles, contain oil (e.g. mineral oil), possibly wax (e.g. paraffin wax), and possibly stabilizers (e.g. amorphous fumed silica). Emulsions can also be used, e.g. oil-in-water (O / W) emulsions (e.g. with mineral oil and / or vegetable oil, such as olive oil, and emulsifiers, as well as possibly stabilizers, wax, and other auxiliaries), or water-in-oil (W / O) emulsions (e.g. with silicone oil and emulsifiers, possibly stabilizers, preservatives, and other auxiliaries).

[0046] Also presented here are pastes containing an abrasive (preferably as specified above and preferably in the amounts mentioned above) and primarily based on PEG (polyethylene glycol). The properties of the pastes are adjusted by blending different PEGs (polyethylene glycols), specifically PEGs of different (average) molecular weights. For example, a mixture can contain 10-50 wt.% PEG-100, 5-30 wt.% (PEG-400), and 1-20 wt.% PEG-6000 (the remainder being abrasive). Another example contains PEG-200 (e.g., 50-80 wt.%) and PEG-6000 (e.g., 5-20 wt.%) (the remainder being abrasive). In general, a PEG-based paste preferably contains the abrasive (preferably as specified above and preferably in the amounts mentioned above), 30-80 wt% (preferably 40-70 wt%) PEG <1000, 1-20 wt% (preferably 5-15 wt%) PEG ≥ 1000 (preferably PEG ≥2000, PEG ≥3000 or PEG ≥4000) and 0-5 wt% (preferably ≤3 wt%) PEG ≥ 1000.-%) other substances (such as stabilizers, emulsifiers, preservatives, auxiliaries).

[0047] The invention relates to the use of a set as described above for polishing a glass surface, specifically for removing scratches from a glass surface. The use is preferably carried out as outlined above, particularly preferably in multiple stages (e.g., two stages), e.g., using two polishing pastes and two different polishing tools.

[0048] The use therefore preferably comprises applying the polishing paste to the glass surface, followed by polishing the glass surface with the aid of the polishing tool, to which a piece of fabric, preferably a microfiber cloth, is optionally attached.

[0049] In particular, it is preferable to use polishing paste to remove existing (deep) scratches in the first step. Only micro-scratches will remain on the surface. In a second step, these micro-scratches are removed with a fine paste, thus polishing the glass surface to a high shine. The polishing rod and, optionally, a piece of cloth (preferably a microfiber cloth) attached to the tip of the polishing rod are used as polishing aids. The microfiber cloth absorbs the paste very well, making the polishing process much easier and more effective. Examples

[0050] The invention is illustrated by examples. However, the invention is not limited to the disclosed examples. Example 1:

[0051] A paste containing polycrystalline diamond powder (grain size D50=1.4 µm; D99<2.9 µm) was used to polish tempered glass (smartphone display) to remove a single visible scratch. A birchwood spatula (a cuboid-shaped wooden plate measuring 15.0 cm in length, 1.0 cm in width, 0.50 cm in depth, flattened on one side with an angle of 3=45°) was used as a polishing aid. A microfiber cloth was wrapped around the tip (a single layer of cloth was wrapped around the tip and secured with a rubber band approximately 2 cm from the tip).

[0052] As a result, the scratch could be removed without creating any visible new (micro)scratches. Example 2:

[0053] The procedure from Example 1 was repeated using a paste with a grain size of D50=2.0 µm (D99<3.7). Subsequently, in a second step, polishing was performed using a paste with a grain size of D50=0.7 µm (D99<1.6). The same birchwood spatula was used as a polishing aid, with a new piece of microfiber cloth wrapped around the end used in the first polishing.

[0054] Despite the two-step process, scratch removal was completed more quickly. Furthermore, upon closer inspection, the quality (smoothness) of the glass surface was improved. Comparison example 1:

[0055] Example 1 was repeated, changing only the polishing aid. The same type of microfiber cloth as in Example 1 was used as the polishing aid, without any additional polishing aid. The microfiber cloth was therefore moved over the glass surface with the finger.

[0056] Although the amount of polishing paste was tripled, the scratch could not be completely removed. Comparison examples 2 and 3:

[0057] Instead of the microfiber cloth from Comparative Example 1, a cotton woven fabric (Comparative Example 2) or a leather polishing cloth (Comparative Example 3) was used, and otherwise the procedure from Comparative Example 1 was repeated. As with Comparative Example 1, the result was unsatisfactory. Comparison example 4:

[0058] The procedure from Comparative Example 1 was repeated, using the same glass as in Example 1 as the surface to be polished, but with only micro-scratches.

[0059] Even the micro-scratches couldn't be removed with the microfiber cloth as the only polishing aid. Cloudy or blind spots remained in the glass.

Claims

1. A use of a kit for polishing a glass surface, the kit comprising: a polishing paste containing abrasive bodies, and a polishing stick in the shape of a spatula.

2. The use according to claim 1, wherein the abrasive bodies are made of a material having a Mohs hardness of 5.5 or more, preferably 7.0 or more, 8.0 or more, 9.0 or more, more preferably 9.2 or more.

3. The use according to claim 1 or 2, wherein the abrasive bodies are made of a material selected from the group consisting of diamond (monocrystalline or preferably polycrystalline diamond), alumina (Al2O3), boron carbide, silicon carbide, cerium oxide and boron nitride.

4. The use according to any one of claims 1 to 3, wherein the polishing stick is made of wood or plastic.

5. The use according to any one of claims 1 to 4, wherein the polishing stick has a length of at least 2 cm, preferably at least 3 cm, at least 4 cm, at least 5 cm, at least 6 cm, at least 7 cm, at least 9 cm, at least 10 cm, or at least 11 cm; and / or has a length of at most 35 cm, preferably at most 30 cm, at most 28 cm, at most 26 cm, at most 25 cm, at most 24 cm, at most 23 cm, at most 22 cm or at most 21 cm, and particularly preferably has a length in a range from 13 to 17 cm.

6. The use according to any one of claims 1 to 5, wherein the polishing stick has a width of at most 2.5 cm, preferably at most 2.0 cm, at most 1.5 cm, or at most 1.0 cm; and / or has a width of at least 0.3 cm, at least 0.4 cm, at least 0.5 cm, at least 0.6 cm or at least 0.7 cm, and particularly preferably has a width in a range from 0.5 to 1.5 cm.

7. The use according to any one of claims 1 to 6, wherein the polishing stick has a thickness of at most 1.50 cm, preferably at most 1.30 cm, at most 1.20 cm, at most 1.10 cm, at most 1.00 cm, or at most 0.90 cm; and / or has a thickness of at least 0.05 cm, preferably at least 0.10 cm, at least 0.15 cm, at least 0.20 cm, at least 0.30 cm, at least 0.40 cm or at least 0.45 cm, and particularly preferably has a thickness in the range from 0.20 to 1.00 cm.

8. The use according to any one of claims 1 to 7, wherein the polishing stick has an aspect ratio (L / T) of length (L) to thickness (T) of at least 6, preferably at least 8, at least 10, at least 15, at least 20 or at least 25; and / or an aspect ratio (L / T) of 100 or less, preferably 90 or less, 80 or less or 70 or less; and / or an aspect ratio (B / T) of width (B) to thickness (T) of 1.3 or more, preferably 1.5 or more, 1.7 or more, 1.9 or more, 2.0 or more, 2.1 or more or 2.2 or more; and / or an aspect ratio (B / T) of 5.0 or less, preferably 4.0 or less, 3.5 or less, 3.2 or less or 3.0 or less.

9. The use according to any one of claims 1 to 8, wherein the abrasive bodies have a mean particle size in a range from 0.05 to 25.0 µm, preferably from 0.10 to 15.0 µm, from 0.10 to 12.0 µm, from 0.10 to 10.0 µm, from 0.10 to 8.0 µm, from 0.10 to 6.0 µm, or from 0.10 to 4.0 µm.

10. The use according to any one of claims 1 to 9, wherein the set comprises, in addition to the polishing paste (first polishing paste), a second polishing paste containing second abrasive bodies, wherein the second abrasive bodies have a smaller mean particle size than the abrasive bodies of the first polishing paste (first abrasive bodies).

11. The use according to claim 10, wherein the second abrasive bodies have a mean particle size of at most 70%, preferably at most 50%, at most 45%, at most 40% of the mean particle size of the first abrasive bodies.

12. The use according to claims 10 or 11, wherein the mean particle size of the first abrasive bodies is in the range from 1.0 to 6.0 µm, preferably from 1.0 to 4.0 µm and the mean particle size of the second abrasive bodies is in a range from 0.1 to 1.5 µm, preferably from 0.4 to 1.3 µm.

13. The use according to any one of claims 1 to 12, wherein the set comprises, in addition to the polishing stick (first polishing stick), a second polishing stick in the shape of a spatula, wherein the second polishing stick has a lower hardness than the first polishing stick.

14. The use according to any one of claims 1 to 13, wherein the set further comprises a piece of fabric, preferably a thin microfiber cloth for covering the polishing face of the polishing stick, wherein the set further preferably comprises a fastening material, such as a clamp or a rubber ring, for reversibly fastening the piece of fabric to the polishing stick.

15. The use according to any one of claims 1 to 14 for removing scratches from a glass surface.

16. The use according to one of claims 1 to 15, comprising applying the polishing paste to the glass surface, followed by polishing the glass surface with the aid of the polishing stick, to which a piece of fabric, preferably a microfiber cloth, is optionally attached.