BS EN 13523-9-2001 "Coil cladding metals. Test methods, resistance to water immersion performance" specifies the test method for the resistance to water immersion performance of coil cladding metals. The standard specifies the conditions and procedures for sample preparation, water immersion test, and specifies the performance evaluation criteria such as coating Appearance and adhesion after testing. It is used to determine the resistance of coil cladding metals to water immersion environments, and provides technical specifications for measuring their waterproof and corrosion resistance and ensuring the mass of products in humid environments.