RoHS is a mandatory standard established by EU legislation. RoHS full name is "Restriction of Hazardous Substances" (Restriction of Hazardous Substances). The standard has been formally implemented on July 1, 2006, and is mainly used to standardize the material and process standards of electrical and electronic products, making it more conducive to human health and environmental protection. The purpose of this standard is to eliminate six substances including lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyls and polybrominated diphenyl ethers in electrical and electronic products, and it specifically stipulates that the lead content cannot exceed 0.1%.

On June 4, 2015, the European Union issued a directive (EU) 2015/863 in its official gazette to amend 2011/65/EU (RoHS 2.0), and officially revised the four phthalates (DEHP, BBP, DBP) , DIBP) Listed in RoHS 2.0 Appendix II, that is, a total of 10 controlled substances in electronic and electrical equipment are restricted.