The RoHS is a mandatory standard set by the EU legislation. Its full name is "Restriction of Hazardous Substances". This standard was formally implemented on July 1, 2006. It is mainly used to standardize the 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 ether, and PBDE is wrong. ) A total of six substances, and focus on the content of lead can not exceed 0.1%.