Expandable graphite expansion strength detection equipment and detection method thereof

Abstract

The invention relates to the technical field of expandable graphite detection, in particular to expandable graphite expansion strength detection equipment and a detection method thereof.The expandable graphite expansion strength detection equipment comprises a base, sliding seats are symmetrically arranged on the base in a sliding mode, supporting rods are arranged on the sides, away from the symmetry center, of the sliding seats correspondingly, and positioning rods are arranged in the supporting rods correspondingly; rotating rods are arranged outside the positioning rods in a sleeving mode, shifting blocks are arranged on the rotating rods, sliding grooves are formed in the supporting rods, positioning grooves are symmetrically formed in the supporting rods, the rotating rods are rotationally connected to fixing plates, extending cylinders matched with the sliding seats are symmetrically arranged on the fixing plates, fixing blocks are symmetrically arranged on the base, and limiting grooves are formed in the fixing blocks. And limiting blocks are arranged in the limiting grooves in a sliding manner. Therefore, by separating and butting the sliding seat and the extension cylinder, an operator can conveniently lay an expandable graphite sample to be flat, the expandable graphite can be quickly and conveniently detected, a quantitative index is provided for thermal expansion performance evaluation of the expandable graphite, and the detection accuracy is improved.

Description

Technical Field

[0001] The invention relates to the technical field of expandable graphite detection, and in particular to an expandable graphite expansion force detection device and a detection method thereof. Background Art

[0002] With the development of science and technology, the demand for high-performance materials is increasing, and accurate measurement of material expansion performance (the expansion performance of materials under high temperature conditions is one of its important physical properties, which directly affects its performance in industrial applications. For example, in the fields of construction, aerospace, and energy) has become a key link. It is particularly important to establish a unified and standardized testing process.

[0003] Currently, the existing detection methods for detecting the expansion force of expandable graphite are mostly to directly place the expandable graphite into a muffle furnace for heating, then transfer the expanded graphite to a measuring cylinder or other detection containers, and then perform a series of measurements on the expanded graphite (such as applying pressure, etc.). However, these detection devices often suffer from material loss when moving the expanded graphite, which not only contaminates the operating table but also affects the accuracy of the detection. In addition, when detecting the expansion force, the force-bearing end surface of the expanded graphite must be flat to improve the accuracy of the detection. The naturally expanded graphite that is directly heated will appear fluffy and its shape is not easy to control. Obviously, the existing direct heating detection device is not only difficult to operate, but the accuracy of the detection also needs to be improved.

[0004] How to separate and dock the sliding seat and the extension tube to facilitate the operator to spread the expandable graphite sample flat, quickly and conveniently test the expandable graphite, provide quantitative indicators for the evaluation of the thermal expansion performance of the expandable graphite, and improve the accuracy of the test has become a technical problem that needs to be broken through.

[0005] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the invention

[0006] In view of the above-mentioned defects, the object of the present invention is to provide an expandable graphite expansion force detection device and a detection method thereof, which can separate and dock the sliding seat and the extension tube, so that the operator can spread the expandable graphite sample flat, quickly and conveniently detect the expandable graphite, provide quantitative indicators for the evaluation of the thermal expansion performance of the expandable graphite, and improve the accuracy of the detection.

[0007] In order to achieve the above-mentioned purpose, the present invention provides an expandable graphite expansion force detection device, including a base, a sliding seat for placing an expandable graphite sample is symmetrically and slidably provided on the base, a support rod is provided on the side of the sliding seat away from the symmetry center, a positioning rod is provided inside the support rod, a rotating rod is sleeved on the outside of the positioning rod, a shift block is provided on the rotating rod, a sliding groove cooperating with the shift block is provided on the support rod, and positioning grooves cooperating with the shift block and connected to the sliding groove are symmetrically provided on the support rod, and one end of the rotating rod away from the base is rotatably connected to a fixed plate, and an extension cylinder cooperating with the sliding seat is symmetrically provided on the fixed plate.

[0008] The base is symmetrically provided with fixing blocks, the fixing blocks are provided with limiting grooves matched with the shifting blocks, and the limiting blocks are slidably provided in the limiting grooves.

[0009] Pull the rotating rod, and the rotating rod drives the fixed plate to move up and down. When the sliding seat and the extension tube abut against each other, space can be provided for the heating and expansion of the expandable graphite sample. When the sliding seat and the extension tube move away from each other, it is convenient for the operator to place the expandable graphite sample and the weight into the sliding seat.

[0010] According to the expandable graphite expansion force detection device of the present invention, an insertion rod is rotatably connected inside the rotating rod, one end of the insertion rod is inserted into the positioning rod, and insertion blocks are symmetrically provided on the insertion rod inside the positioning rod. A slot matching the insertion block is provided inside the positioning rod, and the insertion blocks are slidably set in the slot.

[0011] According to the expandable graphite expansion force detection device of the present invention, a convex ring is provided at one end of the sliding seat close to the extension tube, and a matching groove matching with the convex ring is provided on the extension tube. When the sliding seat and the extension tube abut against each other, the convex ring and the matching groove match each other.

[0012] According to the expandable graphite expansion force detection device of the present invention, the fixed blocks are provided with fixed grooves, the fixed grooves are provided with baffles cooperating with the sliding seat, and the ends of the baffles close to the sliding seat abut against the sliding seat.

[0013] According to the expandable graphite expansion force detection device of the present invention, the base is symmetrically provided with placement grooves, the placement grooves are each provided with a slideway, and the sliding seats are slidably connected in the slideway.

[0014] The present invention also provides a method for detecting the expansion force of expandable graphite, comprising the following steps: Step 1: Sample preparation Pull the fixed plate toward the side away from the base. When the shift block slides to the positioning groove on the side away from the base, rotate the shift block to lock the position of the fixed plate, weigh the expandable graphite sample, and place the weighed expandable graphite sample into the sliding seat. Slide the sliding seat back and forth to evenly flatten the expandable graphite sample in the sliding seat and make the surface of the expandable graphite sample flat.

[0015] Step 2: Install the weights Slide the sliding seat to the bottom of the extension tube, place a weight on each expandable graphite sample in the sliding seat, insert the stopper into the fixed groove, make the sliding seat abut against the extension tube, and use the limit block to lock the position of the shifting block.

[0016] Step 3: Heat treatment Set the temperature of the muffle furnace, record the initial time after the temperature of the muffle furnace stabilizes, place the expandable graphite expansion force detection equipment steadily into the muffle furnace, close the furnace door, and heat at a constant temperature.

[0017] Step 4: Cooling and disassembly Take out the expandable graphite expansion force detection equipment, cool it down naturally to room temperature, pull the limit block to the side away from the base, turn the shift block, pull the fixed plate to the side away from the base, when the shift block slides to the positioning groove on the side away from the base, turn the shift block, lock the position of the fixed plate, and take out the expanded expandable graphite sample.

[0018] Step 5: Measurement and Analysis The height of the expandable graphite sample after expansion is measured and the reading is recorded. The experimental data is organized into a table, including the expandable graphite sample number and the height of the expandable graphite sample after expansion. All data are statistically analyzed and a trend chart is drawn.

[0019] According to the method for detecting the expansion force of expandable graphite of the present invention, in the step three, when constant temperature heating is performed using a muffle furnace, the constant temperature heating is maintained for 30 minutes. During the constant temperature heating, the muffle furnace door must not be opened to avoid affecting the temperature stability.

[0020] According to the method for detecting the expansion force of expandable graphite of the present invention, steps 1 to 5 should be repeated at least three times to verify the reliability of the data.

[0021] According to the method for detecting the expansion force of expandable graphite of the present invention, in the step 1, when weighing the expandable graphite sample, a high-precision electronic balance is used to accurately weigh 2.5 g or 5 g of the expandable graphite sample.

[0022] The purpose of the present invention is to provide an expandable graphite expansion force detection device and a detection method thereof, including a sliding seat, an extension tube and a support rod. By adjusting the rotating rod, separating and docking the sliding seat and the extension tube, it is convenient for the operator to spread the expandable graphite sample flat, and the expandable graphite can be detected quickly and conveniently, thereby improving the accuracy of the detection; the present invention also provides an expandable graphite expansion force detection method, which can intuitively display the change law of the expansion performance of the expandable graphite sample, and provide quantitative indicators for the evaluation of the thermal expansion performance of the expandable graphite. In summary, the beneficial effects of the present invention are: by separating and docking the sliding seat and the extension tube, it is convenient for the operator to spread the expandable graphite sample flat, and the expandable graphite can be detected quickly and conveniently, and quantitative indicators can be provided for the evaluation of the thermal expansion performance of the expandable graphite, thereby improving the accuracy of the detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural diagram of the present invention after installation; Figure 2 It is a structural diagram of the present invention and the supporting weights; Figure 3 It is a structural diagram of the fixed plate of the present invention when it is pulled up; Figure 4 It is a structural diagram of the limit groove and the limit block; Figure 5 It is a cross-sectional view of the rotating rod; in the figure: 1-base, 11-placing groove, 111-slideway, 12-fixed block, 121-fixed groove, 122-limiting groove, 123-limiting block, 2-sliding seat, 21-convex ring, 3-support rod, 31-slide groove, 311-positioning groove, 32-rotating rod, 321-shift block, 322-insertion rod, 33-positioning rod, 4-fixed plate, 41-extension tube, 5-block bar, 6-weight. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", "top / bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] See also Figure 1~Figure 5 The present invention provides an expandable graphite expansion force detection device, including a base 1, a sliding seat 2 is symmetrically slidably provided on the base 1 (a placement groove 11 is symmetrically provided on the base 1, a slideway 111 is provided in the placement groove 11, and the sliding seat 2 is slidably connected in the slideway 111), a storage groove for placing expandable graphite samples is provided on the sliding seat 2, a support rod 3 is provided on the base 1 on the side away from the symmetry center of the sliding seat 2, a positioning rod 33 is provided inside the support rod 3, a rotating rod 32 is sleeved on the outside of the positioning rod 33, a shifting block 321 is provided on the rotating rod 32, and one end of the shifting block 321 away from the rotating rod 32 passes through the support rod 3, a slide groove 31 cooperating with the shifting block 321 is provided on the support rod 3, the slide groove 31 is vertically arranged, and the shifting block 321 can drive When the cam 32 is in the unlock state, the cam 32 is in the unlock state, and the cam 32 is locked to the unlocking state, so that the cam 32 can be unlocked easily.

[0028] See also Figure 5 Preferably, an insert rod 322 is rotatably connected inside the rotating rod 32, one end of the insert rod 322 is inserted into the positioning rod 33, and insert blocks are symmetrically provided on the insert rod 322 inside the positioning rod 33. A slot matching the insert block is provided inside the positioning rod 33, and the insert blocks are slidably set in the slot. The insert rod 322 can improve the stability of the rotating rod 32 during the lifting and lowering of the rotating rod 32.

[0029] See also Figure 1~Figure 3The fixed plate 4 is symmetrically provided with an extension tube 41 that cooperates with the sliding seat 2 (the interior of the extension tube 41 is hollow, and the diameter of the hollow part of the extension tube 41 is approximately equal to the diameter of the storage groove of the sliding seat 2. When the sliding seat 2 and the extension tube 41 abut against each other, a cylindrical space can be formed inside the sliding seat 2 and the extension tube 41). The extension tube 41 can move with the fixed plate 4. When the sliding seat 2 and the extension tube 41 abut against each other, a space can be provided for the heating and expansion of the expandable graphite sample. When the sliding seat 2 and the extension tube 41 are away from each other, it is convenient for the operator to place the expandable graphite sample into the sliding seat 2. The expanded graphite sample and the weight 6 (the weight 6 is used in conjunction with the sliding seat 2 and the extension tube 41, the diameter of the weight 6 matches the diameter of the hollow part inside the extension tube 41 and the diameter of the storage groove, the weight 6 can be smoothly placed inside the sliding seat 2 and the extension tube 41, and when the weight 6 is located inside the sliding seat 2 and the extension tube 41, the outer periphery of the weight 6 can abut against the inner wall of the sliding seat 2 or the extension tube 41), allow the operator to spread the expandable graphite sample flat and then place the weight 6 on the expandable graphite sample, which is convenient for the operator to operate and improves the accuracy of the expandable graphite sample detection.

[0030] See also Figure 1~Figure 3 Preferably, a convex ring 21 is provided at one end of the sliding seat 2 close to the extension tube 41, and a matching groove matching with the convex ring 21 is provided on the extension tube 41. When the sliding seat 2 and the extension tube 41 abut against each other, the convex ring 21 and the matching groove match with each other to improve the stability between the sliding seat 2 and the extension tube 41.

[0031] See also Figure 1~Figure 4 , the base 1 is symmetrically provided with a fixed block 12, the fixed block 12 is provided with a limiting groove 122 that cooperates with the shift block 321, and a limiting block 123 is slidably provided in the limiting groove 122, and the limiting block 123 is slidably connected to the fixed block 12 (the limiting block 123 inside the fixed block 12 is symmetrically provided with a protrusion, and the fixed block 12 is provided with a groove that cooperates with the protrusion, and the protrusion is slidably set in the groove), and the shift block 321 can be smoothly transferred into the limiting groove 122; when the shift block 321 is rotated to the position close to the base 1 When the locking cam 321 is in the locking position, the locking cam 323 is released and the locking cam 323 is in the locking position.

[0032] See also Figure 1~Figure 3Furthermore, a fixing groove 121 is provided on the fixing block 12, and a baffle 5 cooperating with the two sliding seats 2 is inserted in the two fixing grooves 121. The ends of the baffle 5 close to the sliding seat 2 abut against the sliding seat 2. The baffle 5 can limit the position of the sliding seat 2, and before the sliding seat 2 is docked with the extension tube 41, it is ensured that the sliding seat 2 is located directly below the extension tube 41.

[0033] See also Figure 1~Figure 5 When in use, pull the fixing plate 4 toward the side away from the base 1. When the shifting block 321 slides to the positioning groove 311 on the side away from the base 1, rotate the shifting block 321. When the shifting block 321 rotates to the inside of the positioning groove 311 on the side away from the base 1, temporarily lock the position of the rotating rod 32. At this time, slide the sliding seat 2, place the expandable graphite sample in the sliding seat 2, slide the sliding seat 2 back and forth, so that the expandable graphite sample in the sliding seat 2 is evenly distributed (the operator can manually assist in laying the expandable graphite sample flat). After sliding the sliding seat 2 to the bottom of the extension tube 41, the expandable graphite sample in the sliding seat 2 can be distributed. Place a weight 6, insert the blocking bar 5 into the fixed groove 121 to prevent the sliding seat 2 from sliding at will, rotate the shift block 321 to disengage the shift block 321 from the positioning groove 311 on the side away from the base 1, push the fixed plate 4 toward the side close to the base 1, and pull the limit block 123 toward the side away from the base 1 to expose all the limit grooves 122. When the sliding seat 2 and the extension tube 41 just abut against each other, rotate the shift block 321 to the inside of the positioning groove 311 on the side close to the base 1, release the limit block 123, and complete the docking of the sliding seat 2 and the extension tube 41. Transfer the present invention to the heating container and start testing.

[0034] See also Figure 1~Figure 5 Based on the above detection device, the present invention also provides a method for detecting the expansion force of expandable graphite, comprising the following steps: Step 1: Sample preparation Pull the fixed plate 4 toward the side away from the base 1. When the shift block 321 slides to the positioning groove 311 on the side away from the base 1, rotate the shift block 321 to lock the position of the fixed plate 4. Use a high-precision electronic balance (the accuracy must reach 0.0001g) to accurately weigh 2.5g or 5g (the weighed weight can be adjusted according to actual conditions) of expandable graphite sample, and put the weighed expandable graphite sample into the sliding seat 2. Slide the sliding seat 2 back and forth to evenly flatten the expandable graphite sample in the sliding seat 2, and try to make its surface flat without obvious bumps.

[0035] Step 2: Install the weights Slide the sliding seat 2 to the bottom of the extension tube 41 , place a weight 6 on each of the expandable graphite samples in the sliding seat 2 , insert the blocking bar 5 into the fixing groove 121 , make the sliding seat 2 abut against the extension tube 41 , and use the limit block 123 to lock the position of the shifting block 321 .

[0036] Step 3: Heat treatment Set the temperature of the muffle furnace to 600°C, record the initial time after the temperature stabilizes, use a clamp (such as a crucible clamp, etc.) to stably place the expandable graphite expansion force detection equipment (including the sliding seat 2, the extension tube 41 and the base 1 and other structures) into the muffle furnace, and close the furnace door. Keep it at a constant temperature for 30 minutes. During this period, the furnace door must not be opened to avoid affecting the temperature stability.

[0037] Step 4: Cooling and disassembly After taking out the expandable graphite expansion force detection device, let it cool down naturally to room temperature, disassemble the mold, pull the limit block 123 to the side away from the base 1, rotate the shift block 321 (the shift block 321 can be assisted to rotate by rotating the rotating rod 32), pull the fixed plate 4 to the side away from the base 1, when the shift block 321 slides to the positioning groove 311 on the side away from the base 1, rotate the shift block 321, lock the position of the fixed plate 4, and take out the expanded expandable graphite sample, paying attention to keeping the sample intact.

[0038] Step 5: Measurement and Analysis Use a digital caliper (accuracy must reach 0.01mm) to accurately measure the height of the expandable graphite sample after expansion, and record the readings. If multiple measurements are required to verify the reliability of the data, the above steps should be repeated at least three times. The data obtained from each experiment should be organized into a table, including the expandable graphite sample number, the height of the expandable graphite sample after expansion and other information. Perform statistical analysis on all data and draw a trend chart to intuitively display the changing pattern of the sample expansion performance.

[0039] By using the above-mentioned expandable graphite expansion force detection method, the change law of the expansion performance of the expandable graphite sample can be intuitively displayed through parameters such as the weight of the weight 6, the height of the expandable graphite sample after expansion, the heating temperature of the muffle furnace, and the heating time of the muffle furnace. The operator can adjust the process steps of the expandable graphite sample according to the actual needs of the customer and the change law of the expansion performance of the expandable graphite sample, thereby changing the performance of the expandable graphite sample.

[0040] The present invention provides an expandable graphite expansion force detection device, including a sliding seat, an extension tube and a support rod. By adjusting the rotating rod, separating and docking the sliding seat and the extension tube, it is convenient for the operator to spread the expandable graphite sample flat, and the expandable graphite can be detected quickly and conveniently, thereby improving the accuracy of the detection. The present invention also provides an expandable graphite expansion force detection method, which can intuitively display the change law of the expansion performance of the expandable graphite sample, and provide quantitative indicators for the evaluation of the thermal expansion performance of the expandable graphite. In summary, the beneficial effects of the present invention are: by separating and docking the sliding seat and the extension tube, it is convenient for the operator to spread the expandable graphite sample flat, and the expandable graphite can be detected quickly and conveniently, and quantitative indicators can be provided for the evaluation of the thermal expansion performance of the expandable graphite, thereby improving the accuracy of the detection.

[0041] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. An expandable graphite expansion force detection device, characterized in that: It comprises a base, on which a sliding seat for placing an expandable graphite sample is symmetrically and slidably provided, a support rod is provided on one side of the sliding seat away from the symmetry center, a positioning rod is provided inside the support rod, a rotating rod is sleeved on the outside of the positioning rod, a shifting block is provided on the rotating rod, a sliding groove cooperating with the shifting block is provided on the support rod, and a positioning groove cooperating with the shifting block and communicating with the sliding groove is symmetrically provided on the support rod, and one end of the rotating rod away from the base is rotatably connected to a fixing plate, and an extension cylinder cooperating with the sliding seat is symmetrically provided on the fixing plate; The base is symmetrically provided with fixing blocks, the fixing blocks are provided with limiting grooves matched with the shifting blocks, and the limiting blocks are slidably provided in the limiting grooves; Pull the rotating rod, and the rotating rod drives the fixed plate to move up and down. When the sliding seat and the extension tube abut against each other, space can be provided for the heating and expansion of the expandable graphite sample. When the sliding seat and the extension tube move away from each other, it is convenient for the operator to place the expandable graphite sample and the weight into the sliding seat.

2. The expandable graphite expansion force detection device according to claim 1, characterized in that: An insertion rod is rotatably connected inside the rotating rod, one end of the insertion rod is inserted into the positioning rod, and insertion blocks are symmetrically arranged on the insertion rod inside the positioning rod. A slot matching the insertion block is arranged inside the positioning rod, and the insertion blocks are slidably arranged in the slot.

3. The expandable graphite expansion force detection device according to claim 1, characterized in that: The sliding seat is provided with a convex ring at one end close to the extension tube, and the extension tube is provided with a matching groove matching with the convex ring. When the sliding seat and the extension tube abut against each other, the convex ring and the matching groove match each other.

4. The expandable graphite expansion force detection device according to claim 1, characterized in that: The fixing blocks are all provided with fixing grooves, in which blocking bars cooperating with the sliding seat are inserted, and one end of the blocking bars close to the sliding seat abuts against the sliding seat.

5. The expandable graphite expansion force detection device according to claim 1, characterized in that: The base is symmetrically provided with placement grooves, each of which is provided with a slideway, and each of the sliding seats is slidably connected to the slideway.

6. A method for detecting the expansion force of expandable graphite, based on the expandable graphite expansion force detection device according to claim 4, characterized in that: The steps include: Step 1: Sample preparation Pull the fixed plate toward the side away from the base, and when the shift block slides to the positioning groove on the side away from the base, rotate the shift block to lock the position of the fixed plate, weigh the expandable graphite sample, and put the weighed expandable graphite sample into the sliding seat, and slide the sliding seat back and forth to evenly flatten the expandable graphite sample in the sliding seat, so that the surface of the expandable graphite sample is flat; Step 2: Install the weights Slide the sliding seat to the bottom of the extension tube, place a weight on each of the expandable graphite samples in the sliding seat, insert the stopper into the fixed groove, make the sliding seat abut against the extension tube, and use the limit block to lock the position of the shifting block; Step 3: Heat treatment Set the temperature of the muffle furnace, record the initial time after the temperature of the muffle furnace stabilizes, place the expandable graphite expansion force detection device steadily into the muffle furnace, close the furnace door, and perform constant temperature heating; Step 4: Cooling and disassembly Take out the expandable graphite expansion force detection device, cool it down naturally to room temperature, pull the limit block to the side away from the base, turn the shift block, pull the fixed plate to the side away from the base, when the shift block slides to the positioning groove on the side away from the base, turn the shift block, lock the position of the fixed plate, and take out the expanded expandable graphite sample; Step 5: Measurement and Analysis The height of the expandable graphite sample after expansion is measured and the reading is recorded. The experimental data is organized into a table, including the expandable graphite sample number and the height of the expandable graphite sample after expansion. All data are statistically analyzed and a trend chart is drawn.

7. The method for detecting the expansion force of expandable graphite according to claim 6, characterized in that: In the step 3, when the muffle furnace is used for constant temperature heating, the constant temperature heating is maintained for 30 minutes. During the constant temperature heating, the muffle furnace door must not be opened to avoid affecting the temperature stability.

8. The method for detecting the expansion force of expandable graphite according to claim 6, characterized in that: Steps 1 to 5 should be repeated at least three times to verify data reliability.

9. The method for detecting the expansion force of expandable graphite according to claim 6, characterized in that: In the step 1, when weighing the expandable graphite sample, a high-precision electronic balance is used to accurately weigh 2.5 g or 5 g of the expandable graphite sample.

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