RoHS is a mandatory standard established by EU legislation. Its full name is Restriction of Hazardous Substances.

The standard has been officially implemented on July 1, 2006, and is mainly used to standardize the material and process standards of electronic and electrical products, making it more conducive to human health and environmental protection.

The purpose of the standard is to eliminate lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, and polybrominated diphenyl ethers in electrical and electronic products.

The maximum limit indicators are:

· Cadmium: 0.01% (100ppm);

· Lead: 0.1% (1000ppm).

· Mercury: 0.1% (1000ppm).

· Chromium (VI): 0.1% (1000ppm).

· Polybrominated biphenyls (PBB’s): 0.1% (1000ppm).

· Polybrominated diphenyl ethers (PBDE’s): 0.1% (1000ppm).