Coating film hardness: Coating film hardness is not less than 1H pencil hardness. Adhesion: The adhesion of the coating film is not less than level 1. Component separation force and bearing capacity: Component separation force and bearing capacity should meet the requirements of Table 3. Rotating torque and rotating blocking force: Rotating torque and rotating blocking force should meet the requirements of Table 4. High and low temperature performance: High and low temperature resistance performance should comply with the requirements in Table 5. Sealing performance: After sealing test, there should be no water leakage, no deformation, no cracking, no cracks in the coating film and surface decoration pattern, and no obvious discoloration. Drop performance: After drop test, no leakage, no impact on use or rupture. Light aging test: After the light aging test, there was no obvious change in the surface color of the sample and no obvious brittleness change in the material. Vibration test: After the vibration test, the product surface has no scratches, no foreign matter, and the packaging has no deformation. Roller test: After the roller test, no whole piece of coating film fell off.