GB/T 29757-2026Reflective particle decorated coating glass (English PDF)

5.3 Dimensional Deviation

5.3.1 Thickness Deviation The thickness deviation of colored crystal decorative glass is ±0.3mm.

5.3.2 Side length deviation The permissible deviation of the side length of colored crystal decorative glass shall conform to the provisions of Table

3.For other shapes or products with a side length greater than 1800mm, the permissible deviation shall also conform to the provisions of Table 3. The deviation is agreed upon by the supply and demand parties.

5.3.3 Difference between diagonals The diagonal of rectangular products should conform to the specifications in Table 4; for products with a side length greater than 1800 mm and irregular shapes, the difference in diagonal length is determined by The supply and demand sides agree on it.

5.3.4 Print position deviation The permissible deviation for printing position is ±

5.3.5 Aperture and Aperture Deviation The aperture should not be less than the nominal thickness of the glass, and the maximum permissible deviation of the aperture should conform to the provisions of Table 5.

5.3.6 Hole position deviation The hole position deviation shall meet the requirements of GB/T 15763.2, and the maximum permissible deviation of the hole center position is ±1.0mm.

5.4 Flatness The flatness should meet the requirements of GB/T 15763.2, as shown in Table 6.

5.5 Consistency The allowable deviation of the fit of curved colored crystal decorative glass is no more than

1.0 mm. See Figure 1 for a schematic diagram of the fit. Figure

5.13 Adhesion

5.13.1 Cross-cut test After the test, each coated surface should meet or be within Grade 1 as specified in Table 1 of GB/T 9286-2021.

5.13.2 Pull-out test After the test, the minimum adhesion value of the coating on the non-surface surface should not be less than 4 MPa.

5.14 Coating Hardness After the test, the pencil hardness of the coating should be no less than 2H.

5.15 Acid resistance After the test, the coating surface should be free from bulging, peeling, cracks, and flaking, and the color difference of the appearance should meet the requirements of 5.8.

5.16 Alkali resistance After the test, the coating surface should be free from bulging, peeling, cracks, and flaking, and the color difference of the appearance should meet the requirements of 5.8.

5.17 Content of Restricted Substances After testing, the colored crystal decorative glass products contained lead, mercury, hexavalent chromium, polybrominated biphenyls, polybrominated diphenyl ethers, and di(2-ethylhexyl) phthalate. Total content of DEHP, dibutyl phthalate (DBP), butyl benzyl phthalate (BBP) and diisobutyl phthalate (DIBP) The content (mass fraction) shall not exceed 0.1%, and the cadmium content (mass fraction) shall not exceed 0.01%.

5.18 Resistant to organic solvents

5.18.1 Alcohol resistance of the surface coating After the test, the coating surface should be free from bulging, peeling, cracks, and flaking, and the color difference of the appearance should meet the requirements of 5.8.

5.18.2 Non-surface coatings resistant to methyl ethyl ketone (MEK) After the test, the coating surface should be free from bulging, peeling, cracks, and flaking, and the color difference of the appearance should meet the requirements of 5.8.

5.19 Coating Surface Properties

5.19.1 Water contact angle Water contact angle >=80°.

5.19.2 Surface Energy There should be no shrinkage or beading within 5 seconds after the test.

5.20 UV resistant After the test, the color difference between the shielded and unshielded parts of the sample should meet the requirements of 5.8.

5.21 Stain resistance After the test, the appearance of the sample should show no color change, no bulging, no peeling, and the surface should be clean without any marks or stains.

6.3.1 Thickness Deviation Using an outside micrometer with a graduation of

0.01 mm conforming to GB/T 1216 or a measuring instrument with equivalent or higher accuracy, approximately [distance from the edge] The thickness is measured at the center of each of the four sides, 15mm inwards. The arithmetic mean of the measurements is the thickness value, rounded to two decimal places. The difference between the thickness value and the nominal thickness of the substrate glass is the thickness deviation.

6.3.2 Side length deviation The side length of the product shall be measured using calipers with an accuracy of not less than

0.05 mm or measuring instruments with equivalent or higher accuracy.

6.3.3 Difference between diagonals Measure the straight-line distance between the centers of the two diagonal corners using calipers with an accuracy of at least

0.05 mm or a measuring instrument with equivalent or higher accuracy. The absolute value of the difference between the measured values of D1 and D2 is the diagonal difference. A schematic diagram of the diagonal measurement method is shown in Figure 2. Figure

6.3.5 Aperture and Aperture Deviation Use calipers with an accuracy of at least

0.05 mm or a measuring tool with equivalent or higher accuracy to measure the diameter of the round hole. Compare the measured value with the value shown in the drawing. The difference is the aperture deviation.

6.3.6 Hole position deviation Use a caliper with an accuracy of not less than

0.05 mm or a measuring tool with equivalent or higher accuracy to measure the center position of the hole, and compare the measured value with the diagram. The difference in values is the hole position deviation.

6.4 Flatness Using the product as a sample, place it under the test conditions of

6.1 for more than 4 hours, and measure the flatness according to the specifications in GB/T 15763.2-2025. Method measurement.

6.5 degree of fit Using the product as a sample, use a feeler gauge or a steel ruler with a graduation of

0.5 mm conforming to GB/T 22523 to measure along the edge of the sample, perpendicular to... The gap between the glass sample and the design template is measured on the glass surface. The fit of the curved tempered glass is the maximum gap measurement value.

6.6 Impact resistance

6.6.1 Sample Six test specimens were taken for testing. The specimens were manufactured under the same thickness, type, and process conditions as the finished product, with dimensions of 610 × 5-0 mm. 610 5-0mm flat tempered colored crystal decorative glass.

6.6.2 Test Apparatus The test apparatus shall comply with the provisions of Appendix E of GB/T 15763.2-2025.

6.6.3 Test Procedure Low-temperature printed colored crystal glass with a thickness of not less than

3.0 mm. using glass with a diameter of

63.5 mm (approximately 1040

g) conforming to GB/T 308.1 A smooth steel ball is placed at a height of 1000 mm above the specimen surface and allowed to fall freely. The point of impact should be at a distance from the center of the specimen. Within a 25mm range, the impact surface is the surface that appears during actual use. High-temperature printed colored crystal glass with a thickness of not less than

3.0 mm. using glass with a diameter of

50.8 mm (approximately 535

g) conforming to GB/T 308.1 A smooth steel ball is placed at a height of 300 mm above the specimen surface and allowed to fall freely. The point of impact should be at a distance from the center of the specimen. Within a 25mm range, the impact surface is the surface that appears during actual use. Each specimen was subjected to impact only once, and its condition was observed to determine if it was damaged. Impact resistance tests for other thicknesses and special dimensions shall be agreed upon by the supplier and the buyer.

6.7 Fragmentation Status Four pieces of the product were used as test samples and tested according to the method specified in

6.9 of GB/T 15763.2-2025.

6.8 Color difference Visual colorimetric comparison shall be performed according to the method specified in Chapter 8 of GB/T 9761-2008.

6.9 Moisture resistance

6.9.1 Sample Prepared using the same materials and processing techniques as the finished product, the samples are.200mm × 300mm in size, and three pieces are required. Before the test, the samples... It should be placed under the test conditions of

6.1 for at least 16 hours.

6.9.2 Test Procedure The temperature of the constant temperature and humidity chamber was maintained at 50°C±2°C and the relative humidity at (95±4)%. The sample was placed vertically in the sealed chamber with a certain gap. The samples were placed in a constant temperature and humidity chamber for 168 hours. After the test, the samples were removed and left at room temperature for 24 hours before being visually observed.

6.10 Heat resistance

6.10.1 Sample Prepared using the same materials and processing techniques as the finished product, the samples are.200mm × 300mm in size, and three pieces are required. Before the test, the samples... It should be placed under the test conditions of

6.1 for at least 16 hours.

6.10.2 Test Procedure Place the samples in the temperature-controlled chamber, leaving appropriate gaps between them. Heat to 120°C±2°C and hold for 2 hours, then remove the samples. Remove from the oven and allow to cool naturally to room temperature. Observe visually after 30 minutes.

6.11 Resistance to boiling water Three samples, each.200mm × 300mm in size, prepared using the same material and processing technology as the product, were vertically immersed in the immersion solution. In the boiling water bath, appropriate gaps should be left between the samples. Keep for 1 hour, then remove and wipe the water stains off the positive and negative surfaces with a dry cloth. Cool to room temperature. Visually observe after 30 minutes.

6.12 Resistance to thermal cycling

6.12.1 Sample Prepared using the same materials and processing techniques as the finished product, the samples are.200mm × 300mm in size, and three pieces are required. Before the test, the samples... It should be placed under the test conditions of

6.1 for at least 16 hours.

6.12.2 Test Procedure Place the samples in the temperature control chamber, leaving appropriate gaps between them, and then close the chamber. Maintain the sample temperature at -30°C ± 2°C. Cycle between 60°C±2°C. At each extreme temperature, maintain stability for at least 4 hours. For high and low temperature cycling, the heating time should be <=

1.5 hours, and the cooling time should be <=

1.5 hours. Temperature setting time <= 2.5h. Cycle 5 times, allow to cool naturally to room temperature, and visually observe after 30 minutes.

6.13 Adhesion

6.13.1 Cross-cut test Three different locations were randomly selected on the non-surface surface of a product. The spacing between these three locations and the spacing of the remaining coating edges were all... The thickness should not be less than 5mm. Tests should be conducted according to Chapters 8 and 10 of GB/T 9286-2021, with a grid spacing of 1mm. (For coated exteriors...) The surface with a coating needs to be tested; the uncoated surface does not need to be tested.

6.13.2 Pull-out test (non-appearance surface) Use instruments that meet the requirements of GB/T 5210 and follow the steps below to conduct the test.

a) Select a suitable adhesive whose cohesive strength and adhesion are greater than those of the tested coating.

b) Select 9 points. one point at each of the four corners of the glass (within a radius R=10cm) (4 points in total), and one point at the center of the glass surface. Four points are selected. one point at a time, and one point at each of the four sides of the glass within a distance L=10cm from the edge.

c) The metal bonding block of the testing instrument is fixed to the ink coating on the back of the glass with adhesive.

d) After complete curing for 24 hours in an environment with a temperature of 25°C±2°C and a relative humidity of 50%, apply the ink using a hollow cylindrical cutter. The layers were cut to make their area match the area of the circular metal sample to be bonded, and then the experiment was conducted.

e) Load the testing instrument onto the metal adhesive block device and align it, gradually increasing the load until the adhesive block detaches from the coating. Record the detachment time. Calculate the adhesion force based on the load value. All nine points selected according to

b) should be tested, and the results of all valid points (load values greater than or equal to) should be recorded. The adhesion value is measured at points where the coating is intact and at a pressure of 4 MPa. If the number of valid points is less than 5, the test is invalid and should be repeated. Sampling test. The minimum adhesion value among all effective points is taken as the test result.

6.14 Coating Hardness On a single product, three different locations are randomly selected for each coating layer. The distance between the edges of these three locations and the minimum distance from the coating edge are determined. The spacing should be no less than 5 mm, and the test should be conducted according to GB/T 6739.

6.15 Acid resistance On a single product, three different locations are randomly selected for each coating layer. The distance between the edges of these three locations and the minimum distance from the coating edge are determined. The spacing between each drop should be no less than 5 mm. Take

1.0 mL of a 5% CH3COOH solution and drop it onto the sample coating surface. Separately, take a transparent... Cover with a clear cup, wash with water after 24 hours, air dry for 1 hour, and then visually inspect.

6.16 Alkali resistance On a single product, three different locations are randomly selected for each coating layer. The distance between the edges of these three locations and the minimum distance from the coating edge are determined. With spacing not less than 5 mm, transfer

1.0 mL of 5% Na2CO3 solution and drop it onto the sample coating surface. Separately, take a transparent cup... Cover it, wash it with water after 24 hours, let it air dry for 1 hour, and then visually inspect it.

6.17 Content of Restricted Substances Take one piece of each product and test it according to the methods in GB/T 26125 and GB/T 29786 respectively.

6.18.1 Alcohol resistance of the surface coating

6.18.1.1 Sample Made from the same materials and processed using the same techniques, these three pieces are.200mm x 300mm in size.

6.18.1.2 Test Apparatus A tester for color fastness to rubbing with a cylindrical rubbing head of 16mm ± 0.1mm in diameter shall comply with the requirements of GB/T 3920.

6.18.1.3 Friction cloth Square cotton friction cloth with dimensions of 50mm±2mm×50mm±2mm should conform to the requirements of GB/T 7568.2.

6.18.1.4 Test Procedure Before the test, place the sample and friction cloth under test conditions

6.1 for at least 16 hours. Secure the sample to the test using a clamping device. On the instrument platform, align the length direction of the sample with the running direction of the friction head. After weighing the cotton friction cloth, completely immerse it in anhydrous ethanol and weigh it again. The amount of friction cloth should be adjusted to ensure that the liquid content of the friction cloth reaches 95%~100%. Alternatively, an adjustable liquid-squeezing device or other suitable device can be used to adjust the friction cloth's liquid content. Moisture content of the wiping cloth. The conditioned friction cloth was placed flat on the friction head, and the friction was repeated 15 times per second. Sample. The upper friction stroke is 104mm ± 3mm, and the applied downward pressure is 9N ± 0.2N. The minimum distance between the friction area and the coating edge is not less than [missing value]. 5mm. After the test, remove the sample, let it air dry naturally, and then observe it visually.

6.18.2 Non-surface coatings resistant to methyl ethyl ketone (MEK) On a single product, three different locations were randomly selected. The distance between the edges of these three locations and the minimum distance from the coating edge were all considerable. Apply

1.0 mL of butanone (analytical grade) to a non-visual coating surface of the sample, immediately cover with a watch glass to prevent evaporation, and proceed according to 6.1. Place under the specified test conditions for 2 minutes. After 2 minutes, remove the petri dish, blot away any residual solvent with absorbent paper, and allow it to air dry for 30 minutes before visually inspecting it. Observe the changes in the coating.

6.19 Coating Surface Properties

6.19.1 Water contact angle The sample and the finished product are made of the same material and under the same processing technology, with dimensions of.200mm × 300mm, and there is one sample in total. GB/T 30693 uses a water contact angle tester to test the water contact angle of the surface coating.

6.19.2 Surface Energy The sample is a finished product, quantity 1 piece. Select a pen conforming to GB/T 14216 with a strength of not less than 38 mN/m dyne, and clean the back paint surface of the product. Lay it flat on a level table, and use a dyne pen to select three non-adjacent locations on the back of the paint (excluding the window area), and add appropriate colors. Draw a 100mm long line for each pressure point, and observe the contraction of the lines within 5 seconds.

6.20 UV resistant Three test specimens, each measuring.200mm × 300mm, were prepared using the same materials and processes as the finished product. The front of each specimen was coated with aluminum foil. The aluminum foil tape is applied smoothly, covering approximately one-third of the total area. It is then placed in a UV chamber and tested using a UVB-313 ultraviolet lamp. During the test, the outer surface of the sample was irradiated by the light source, as detailed in Table

8.After placing the sample in the water, the test was completed after a total of two exposure cycles (24 hours). Produce the sample and observe the color difference between the shaded and unshaded areas. Table 8 UV resistance test conditions Irradiance black standard temperature for one exposure cycle Drying at 310nm for 8 hours, 0.55W/m^2, 60°C±3°C 4 hours of condensation, light source off, 50°C±3°C

6.21 Stain resistance The test sample can be a specimen or a finished product. The test sample and the finished product must share the same materials and manufacturing process, and the quantity is one piece. Each sample must meet food safety standards. A drop of commercially available dark soy sauce was applied to the surface of the sample. A red oil-based marker conforming to QB/T 2777 was used to mark the surface of the sample, indicating each contaminant. The contaminated area should be no less than 15 mm^2. The sample should be placed in a constant temperature environment of 30°C for 24 hours. After that, wipe the contaminant with a dry cloth dampened with alcohol, and then... After erasing with an eraser, observe visually under natural light.

7.2 Factory Inspection

7.2.1 Inspection Items This includes appearance quality, dimensional deviation, flatness, fit, color difference, and adhesion (cross-cut test).

7.2.2 Batching Colored crystal decorative glass of the same specifications produced continuously using the same raw materials and the same process constitutes a batch.

7.2.3 Sampling

7.2.3.1 Appearance quality, dimensional deviation, flatness, fit, and color difference. Random sampling shall be performed according to Table

9.When the sample size is equal to or exceeds the batch size, 100% inspection shall be performed; when the batch size exceeds 10,000 pieces... At that time, sampling was conducted in batches of 10,000 pieces.

7.2.3.2 Adhesion One piece was randomly selected from the products that passed the inspections for appearance quality, dimensional deviation, flatness, fit, and color difference for adhesion testing. test.

7.2.4 Single Item Judgment

7.2.4.1 Appearance quality, dimensional deviation, flatness, fit, and color difference. If the number of defective products in terms of appearance quality, dimensional deviation, flatness, fit, and color difference is greater than or equal to the rejection number in Table 9, then the batch is considered defective. If the above items of the product are not up to standard, the above items are considered to be up to standard if the number of unqualified products is less than the number of rejections in Table 9.

7.2.4.2 Adhesion A product is considered (qualified) if all three points on each coated surface meet the requirements; if two or more points on any coated surface fail to meet the requirements, the entire batch of products is considered (unqualified). The adhesion was not up to standard; if any part fails to meet the requirements, an additional sample should be added and the test repeated, ensuring that all three points on each coating surface meet the requirements. If it is, it is considered qualified; otherwise, it is considered unqualified.

7.2.5 Comprehensive Judgment If the appearance quality, dimensional deviation, flatness, fit, color difference, and adhesion all meet the requirements, then the batch of products is deemed to have passed the factory inspection; otherwise... Then it is considered unqualified.

7.3 Type Testing

7.3.1 General Rules Type testing shall be conducted under any of the following circumstances.

a) During the trial production and type approval of new products or products transferred to another factory for manufacturing;

b) If, after formal production begins, significant changes occur in the structure, materials, or processes that may affect product performance;

c) During normal production, this should be carried out once a year;

d) When resuming production after a product has been out of service for more than 6 months;

e) When the factory inspection results differ significantly from the previous type inspection results.

7.3.2 Inspection Items Includes all requirements in Chapter 5.

7.3.3 Batching Same as 7.2.2.

7.3.4 Sampling

7.3.4.1 Appearance quality, dimensional deviation, flatness, fit, and color difference. Eight pieces were randomly selected from a batch of products for tests on appearance quality, dimensional deviation, flatness, fit, and color difference.

7.3.4.2 Fragmentation state, adhesion, coating hardness, acid resistance, alkali resistance From the colored crystal decorative glass that has passed inspections for appearance quality, dimensional deviation, flatness, fit, and color difference, select the required quantity according to the inspection items. Randomly selected products were tested for fragmentation, adhesion, coating hardness, acid resistance, and alkali resistance.

7.3.4.3 Content of Restricted Substances A piece was randomly selected for inspection.

7.3.5 Single Item Judgment

7.3.5.1 Appearance quality, dimensional deviation, flatness, fit, color difference Same as 7.2.4.1.

7.3.5.2 Impact resistance The test is considered (qualified) if all six test samples meet the requirements; otherwise, it is (unqualified).

7.3.5.3 Fragmentation state, moisture resistance, heat resistance, boiling water resistance, thermal cycling resistance, content of restricted substances, resistance to organic solvents, surface energy of coating, UV resistance and stain resistance The sample is considered qualified if all requirements are met; otherwise, it is considered unqualified.

7.3.5.4 Adhesion, coating hardness, acid resistance, alkali resistance A product is considered (qualified) if all three points on each coated surface meet the requirements; if two or more points on any coated surface fail to meet the requirements, the entire batch of products is considered (unqualified). The adhesion was not up to standard; if any part fails to meet the requirements, an additional sample should be added and the test repeated, ensuring that all three points on each coating surface meet the requirements. If it is, it is considered qualified; otherwise, it is considered unqualified.

7.3.6 Comprehensive Judgment Appearance quality, dimensional deviation, flatness, fit, impact resistance, fragmentation, color difference, moisture resistance, heat resistance, boiling water resistance, and resistance to hot and cold temperatures. Cyclicity, adhesion, coating hardness, acid resistance, alkali resistance, restricted substance content, organic solvent resistance, coating surface properties, UV resistance, and stain resistance. If all performance requirements are met, the batch of products is deemed qualified; otherwise, it is deemed unqualified.