RoHS is a mandatory standard enacted by EU legislation, and its full name is the Restriction of Hazardous Substances (Restriction of Hazardous Substances). The standard was officially implemented on July 1, 2006. It is mainly used to standardize materials and process standards for electrical and electronic products, making it more conducive to human health and environmental protection. The purpose of this standard is to eliminate lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls and polybrominated diphenyl ethers in electrical and electronic products (Note: the correct Chinese name for PBDE refers to polybrominated diphenyl ethers, and polybrominated diphenyl ethers are wrong. A total of 6 substances, with a focus on the lead content of not more than 0.1%.