GB/T 18847-2026Film laminated metal plate for building decoration (English PDF)

5.1 Aluminum and aluminum alloy sheets

5.1.1 The chemical composition of aluminum and aluminum alloy sheets shall meet the requirements of GB/T 3190, and the mechanical properties shall meet the requirements of GB/T 3880.2. Dimensional tolerances should conform to the requirements of GB/T 3880.3.The aluminum alloy sheets used for outdoor aluminum clad panels should be from the 3xxx series or 5xxx series. Or 6××× series aluminum alloy.

5.1.2 When aluminum and aluminum alloy sheets have a coating on the back, they should conform to the requirements of YS/T 431; when they have a polymer film on the back, they should conform to YB/T 4516. Requirements.

5.2 Steel Plate

5.2.1 Hot-dip galvanized steel and hot-dip aluminized zinc steel shall comply with the requirements of GB/T 2518; the quality of the zinc coating (double-sided) of hot-dip galvanized steel shall not be lower than The zinc coating quality (double-sided) of hot-dip aluminum-zinc steel should not be less than 72 g/m2.

5.2.2 Hot-dip galvanized aluminum-magnesium steel shall meet the requirements of YB/T 4761, and the quality of the galvanized layer (double-sided) shall not be less than 60 g/m2.

5.2.3 Stainless steel shall meet the requirements of GB/T 3280.

5.2.4 When the back of the steel plate has a coating, it should conform to the requirements of GB/T 12754; when the back has a polymer film, it should conform to YB/T 4516. Require.

5.3 Metal Composite Panels It should meet the standard requirements of the corresponding metal composite panel products.

5.4 Surface Layer

5.4.1 Polyvinyl chloride (PVC) film shall meet the requirements of GB/T 3830.

5.4.2 Fluorocarbon membranes (PVDF, PVF) shall meet the requirements of

5.3 in JC/T 2605-2021.

5.4.3 Polyester film (PET) shall meet the requirements of QB/T 5709.

5.4.4 Polyolefin functional self-adhesive films (POFA) shall meet the requirements of Table 1.

6.4 Weather resistance When the product is used outdoors, its weather resistance should meet the requirements of Table 5.

6.5 Limits for Hazardous Substances The limits for hazardous substances in indoor coated metal panels should meet the requirements of Table 6.

6.6 Antibacterial and antifungal properties For indoor products with antibacterial and antifungal properties, the antibacterial and antifungal performance should meet the requirements of Table 7.

6.7 Thermal insulation performance For products with reflective heat insulation function, the reflective heat insulation performance should meet the requirements of Table 8.

6.8 Self-cleaning performance Outdoor products with hydrophobic self-cleaning function have a contact angle >=90°.

6.9 Radiative Cooling Performance For products with radiative cooling function, the net radiative cooling power should not be less than 20 W/m2.

6.10 Combustion performance When required by users, the product's flammability rating should be provided.

7.4 Dimensional tolerances

7.4.1 Length Use a steel tape measure with a minimum graduation of 1 mm to measure at positions 100 mm from the end and in the middle, taking at least three measurements on each specimen. The test results were obtained by taking the limit deviation between the measured values and the nominal values of the three specimen lengths at three locations.

7.4.2 Width Use a steel tape measure with a minimum graduation of 1 mm to measure at positions 100 mm from the end and in the middle, taking at least three measurements on each specimen. The test results were obtained by taking the limit deviation between the measured and nominal values of the width of the three specimens at three locations.

7.4.3 Difference between diagonals Use a steel tape measure with a minimum graduation of 1 mm to measure and calculate the difference in length between the two diagonals of the same specimen. (Using three specimens as an example...) The maximum difference measured is taken as the experimental result.

7.4.4 Flatness Place the specimen with the decorative side facing up on a horizontal platform. Place a 1000 mm long steel ruler perpendicular to the surface of the platform, with the ruler's surface perpendicular to the platform. The maximum gap between the steel ruler and the plate surface was measured using a feeler gauge. The maximum value among the three test specimens was taken as the test result.

7.4.5 Side Straightness Place the specimen flat on a level platform. Align the side of a 1000 mm long steel ruler with the edge of the plate, and then use a feeler gauge to measure the distance between the edge of the plate and the steel ruler. The maximum gap between the sides of the ruler. The maximum value among the three test measurements is taken as the inspection result.

7.5 film thickness Measurements were performed according to the metallographic microscopy method in Chapter 4 of GB/T 13448-2019.The film thickness measurements of three specimens were compared with the nominal values. The limit deviation between the three test specimens is taken as the test result; if there is no nominal value, the arithmetic mean of the film thickness of the three specimens is taken as the nominal thickness value.

7.6 Poor gloss According to GB/T 9754, measurements should be taken at an incident angle of 60°, and at least four corners 10 mm from the edge of each specimen should be measured. Five positions, including the center. The production direction of the sample should be kept consistent during the test. The maximum and minimum values among the three test specimens are used as the reference. The difference is taken as the experimental result.

7.7 Pencil Hardness The test was conducted according to GB/T 6739.The worst pencil hardness value among all specimens that showed plastic deformation was taken as the test result.

7.8 Fit Conduct the experiment according to Appendix A.

7.9 Cupping Test The cupping test shall be conducted according to Chapter 14 of GB/T 13448-2019.When the product is a metal composite coated plate, the preparation... The metal substrate with the coating is used as the test piece. The coating surface and adhesion must not be damaged during the preparation of the test piece.

7.10 Flexibility Leave a 13 mm to 20 mm clamping section at one end of the coated metal plate specimen, bend it outwards by more than 90° with the coated side facing outwards, and then use smooth pliers. The vise clamps the coated metal plate so that it adheres tightly to itself at a 180° angle, known as 0T. The coating is then observed under a 5x to 10x magnifying glass for any changes. If discoloration, cracking, or peeling occurs, continue to tightly adhere to the previously wrapped portion and bend it 180°, this is called 1T. Observe the coating again for any discoloration or cracking. Cracks or peeling. Repeat this process 2T, 3T, until the coating does not initially exhibit discoloration, cracking, or peeling. (T-bending process) As shown in Figure 1, the maximum T value among the three test results is taken as the inspection result. When the product is a metal composite coated plate, the sample with... The coated metal substrate is the test piece, and the surface of the coating and the adhesion must not be damaged during the preparation of the test piece. The unit is millimeters. Figure

7.11 Chemical stability

7.11.1 Hydrochloric acid resistance One end of a glass tube with an inner diameter of not less than 50 mm is bonded to the center of the test coating surface with Vaseline to ensure a good seal. Pour in a 10% hydrochloric acid solution until the reagent level is 20 mm ± 5 mm, cover the top of the glass tube, and let it stand for 168 hours. Remove the sample, wash and dry it, and visually inspect the mask for any abnormalities such as fading, swelling, or delamination. All samples showed no abnormalities. The test results are as follows: The result showed no fading, swelling, or delamination.

7.11.2 Sulfuric acid resistance According to the test method in 7.11.1, the chemical reagent used is a 10% (v/v) sulfuric acid solution. Visually inspect the mask for discoloration, swelling, or delamination. No abnormal phenomena were observed in any of the samples. The test results showed no fading, swelling, or delamination.

7.11.3 Resistance to hydrofluoric acid According to the test method in 7.11.1, the chemical reagent used is a 10% hydrofluoric acid solution (volume fraction). Visually inspect the mask for discoloration, swelling, or separation. No abnormal phenomena such as delamination were observed in any of the samples. The test results showed no fading, swelling, or delamination.

7.11.4 Alkali resistance According to the test method in 7.11.1, the chemical reagent used is a 10% sodium hydroxide solution. Visually inspect the mask for discoloration, swelling, etc. No abnormalities such as delamination were observed in any of the samples. The test results showed no fading, swelling, or delamination. This was in accordance with GB/T 11942. Measure the color difference of the specimen at the same location and in the same direction before and after the alkali resistance test, and take the maximum value of the three specimen color difference test values as the color difference inspection result. result.

7.12 Solvent resistance Wrap a flexible wiping head with four layers of medical gauze, saturate it with anhydrous ethanol solvent, and immediately apply 1000 g ± 1000 g to the same spot on the surface of the coated sample. Apply 100 g of force and scrub back and forth 100 times. Visually inspect the scrubbed area to see if the inner layer is exposed. The scrubbing stroke is approximately 100 mm, and the frequency is approximately 100 times/min. The contact area between the wiping head and the sample is 2 cm^2. The gauze should be kept moist during the test. All samples showed no abnormalities, and the test result was negative. Discoloration, swelling, and delamination.

7.13 Stain Resistance

7.13.1 Configure gray For outdoor products, the tests shall be conducted in accordance with the provisions of

5.4 of GB/T 9780-2013, and the arithmetic mean of the test values of all specimens shall be taken as the average. To verify the results.

7.13.2 Oil-based marker For indoor use products, make three marks on the surface of the test piece using black, blue, and red oil-based markers (without damaging the mask layer). Each type... Apply the color once, with a mark length of 30 mm to 50 mm. After the surface of the specimen is completely dry, use a cotton swab soaked in acetone (chemically pure) solution to... Wipe the surface of the specimen and observe it.

7.14 Impact resistance The test was conducted according to GB/T 1732, with the impact hammer having a mass of 1000 g ± 10 g and the punch diameter of

0.3 mm. With the decorative side facing upwards, the impact height was 500 mm, and the surface of the specimen was observed after impact. The worst test value among the three specimens was taken as the final test result. result.

7.15 Abrasion resistance The test shall be conducted in accordance with the provisions of GB/T 23988, and the test sand shall be standard sand.

7.16 Low-temperature processability Place the specimen in a refrigerator at -5 °C±2 °C for 1 hour, then remove it and immediately place it with the film layer facing outwards onto a pair of smooth-jawed clamps. Bend the specimen at 90° angles using a bench vise or a dedicated bending machine, with the bending radius equal to the thickness of the specimen. Visually inspect the surface of the specimen for cracks at the bends. Phenomena such as cracks, peeling, and discoloration.

7.17 Hot water resistance The test specimens were immersed in distilled water at a constant temperature for 2 hours. The distilled water temperature for indoor use was 80 °C ± 2 °C, and the distilled water temperature for outdoor use was... The temperature should be 98°C±2°C. During the test, avoid moving or contacting the specimens. Then allow the specimens to cool naturally to room temperature in the distilled water before removing them. Wipe dry and visually inspect the specimen for any abnormal changes in appearance such as shrinkage, cracks, fissures, blistering, peeling, and discoloration. Keep a distance of no more than Delamination between the substrate and the film within 10 mm is negligible.

7.18 Peel strength The test shall be conducted according to Method 1 in GB/T 2792-2014, and the arithmetic mean of the test values of the three specimens shall be used as the test result.

7.19 Resistance to neutral salt spray The test shall be conducted in accordance with the provisions of GB/T 10125.The coated metal plate specimen shall be bent 90° along the centerline of the length direction and sealed on all four sides. According to GB/T 1740 rating, all samples were rated no lower than Grade 1, and the test results were rated no lower than Grade 1.

7.20 Accelerated Aging Resistance Test Xenon lamp aging test was conducted, with a black standard temperature of 65 °C±3 °C and a relative humidity of (65±5)%. Other parameters were in accordance with GB/T 16259-2026. The process shall be carried out in accordance with the provisions of Method A. After the specified time has elapsed, the color difference and gloss before and after aging shall be measured in accordance with GB/T 11942, GB/T 9754 and 7.18. The retention rate and peel strength were evaluated, with the color difference and gloss retention rate measured as the arithmetic mean of the test values of three specimens.

7.21 Resistance to damp heat The tests and ratings were conducted according to GB/T 1740, with a temperature of 47 °C ± 1 °C and a relative humidity of (96 ± 2)%. The sample is no less than level 1, and the test results are no less than level 1.

7.22 Formaldehyde Emission The test shall be conducted in accordance with GB 18580.

7.23 Content of Migratable Harmful Elements The test shall be conducted in accordance with GB 18584.

7.27 Thermal insulation performance

7.27.1 Brightness The test shall be conducted in accordance with the provisions of GB/T 11186.

7.27.2 Near-infrared reflectance The test shall be conducted in accordance with Appendix A of JG/T 402-2013.

7.27.3 Solar reflectance The test shall be conducted in accordance with Appendix A of JG/T 402-2013.

7.27.4 Thermal insulation temperature difference The test shall be conducted in accordance with Appendix B of JG/T 402-2013.

7.28 Self-cleaning performance The test shall be conducted in accordance with GB/T 30693.

7.29 Radiative Cooling Performance The test was conducted according to Appendix A of QB/T 5970-2023, with a test surface temperature of 298 K.

7.30 Combustion performance The test shall be conducted in accordance with GB 8624.

8.2 Inspection conditions and inspection items

8.2.1 Each batch of products shall undergo factory inspection. Factory inspection items include appearance quality, dimensional tolerances, film thickness, adhesion, and heat resistance. Water-based.

8.2.2 Type testing shall be conducted in any of the following circumstances. The testing items shall include all the requirements specified in Chapter 6.

a) Trial production and type approval of new products;

b) When there are significant changes in the raw materials or processes of the product, which may affect the product performance;

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

d) When the factory inspection results differ significantly from the previous type inspection results;

e) During normal production, tests shall be conducted annually, with tests for resistance to neutral salt spray, accelerated aging, and damp heat resistance conducted every three years. It is conducted once a year.

8.3 Batching and Sampling

8.3.1 Batching Products of the same variety, specification, and color produced continuously, with a total area of 3,000 m2, constitute a batch; products with an area of less than 3,000 m2 are also considered as a batch. calculate.

8.3.2 Sampling

8.3.2.1 Factory Inspection Appearance quality and dimensional tolerances should be checked on a sheet-by-sheet or roll-by-roll basis. Other factory inspection items should be randomly selected from the same inspection batch and must meet the requirements. The corresponding number of samples in Table 9.

8.3.2.2 Type Testing For batches that pass factory inspection, three sheets of sheet products should be randomly selected, and the sample quantity should meet the corresponding items in Table 9; for strip products, the sample quantity should be... Cut from the head or tail of the roll, and the number of cuts should meet the sample quantity requirements for the corresponding items in Table

9.For re-inspection, cut from the other end of the roll, at a distance from the roll. The tail end is a maximum of 20 m.

8.4 Judgment Rules

8.4.1 Factory Inspection The rules for determining and retesting test results are as follows:

a) If the appearance quality and dimensional tolerances are not up to standard, it is considered a single piece of non-conformity.

b) If the test results for film thickness, adhesion, and hot water resistance all meet the standard requirements, the batch of products is considered qualified. If any one of them fails to meet the requirements... If the product is (qualified), double the sample size can be taken from the batch for retesting of any non-compliant items. If all retest results meet the standards, the product must be (qualified). If the product is qualified, the batch is deemed qualified; otherwise, the batch is deemed unqualified.

8.4.2 Type Testing If all test results meet the requirements of this document, the batch of products is deemed (qualified). If any item fails to meet the requirements, further testing can be conducted on the batch. Double the sample size is used for retesting of non-conforming items. If all retest results meet the standard requirements, the batch of products is deemed (qualified); otherwise, it is deemed (unqualified). This batch of products is substandard.

9.1 Marking

9.1.1 Each sheet (roll) of product shall be marked with the product mark, production or installation direction, manufacturer's name and address, trademark, color, batch number, production date, and execution date. Standards and quality inspection certificates.

9.1.2 Product packaging markings shall comply with the provisions of GB/T 191 and GB/T 6388.The following markings shall be present in a conspicuous location on the packaging.

a) Company name;

b) Product markings and colors;

c) Production batch number or production date;

d) Quantity of contents;

e) Product specifications;

f) Implementation standards.

9.2 Packaging

9.2.1 The decorative surface of the product should be covered with a protective film.

9.2.2 The packaging box should have sufficient strength and rigidity to prevent the product from moving inside the box.

9.3 Transportation Handle with care during transportation and handling; do not drop or throw to prevent product damage.

9.4 Storage Storage shall comply with the following regulations.

a) They should be stacked and stored separately according to variety, specification and color in a dry and ventilated place, avoiding high temperature and exposure to sunlight and rain, and preventing surface scratches;

b) The roll material should be placed on rubber mats, wooden blocks, brackets, or other similar devices, and should not be placed directly on the ground or on the transport vehicle. The straps and locks should be secure. Upward;

c) Roll materials should not be stacked. If stacking is necessary, the number of stacking layers should not exceed 2 layers, and the roll materials with large weight and volume should be placed at the bottom.

9.5 Accompanying Documents

9.5.1 The supplier shall provide the purchaser with an application guide to ensure the correct use of the product.

9.5.2 The supplier shall provide the purchaser with a product certificate of conformity, which shall include the following information.

a) Company name;

b) Inspection results and inspection pass markings;

c) Product color and specifications;

d) Product batch number or production date.