RoHS is a compulsory standard formulated by EU legislation. Its full name is the restriction of hazardous substances in electrical and electronic equipment. The standard has been formally implemented on July 1, 2006, which is mainly used to standardize the material and process standards of electronic and electrical products, so as to make 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 (Note: the correct Chinese name of PBDE refers to polybrominated diphenyl ether, polybrominated diphenyl ether is wrong) in electrical and electronic products, and the content of cadmium should not exceed 0.01%.

Products without ROHS certification will cause immeasurable damage to manufacturers. At that time, no one will pay attention to the products and lose the market. If the products enter the other party's market by chance, once found out, they will encounter high fines or even criminal detention, which may lead to the closure of the entire enterprise.

According to the requirements of the European Union WEEE & ROHS directive, the qualified third-party testing agency in China is to split the products according to the material and test the harmful substances with different materials. In general:

Metal materials should be tested for four harmful metal elements, such as (CD CD / Pb / HG HG / Cr6 + Cr (VI))

In addition to these four harmful heavy metal elements, the brominated flame retardant (PBB / PBDE) should be detected

At the same time, heavy metals in different packaging materials need to be tested separately (94 / 62 / EEC)

The following is the upper limit concentration of six harmful substances in RoHS:

Cadmium: less than 100ppm

Lead: less than 1000ppm

Less than 3500ppm in steel alloy

Less than 4000ppm in aluminum alloy

Less than 40000 ppm in copper alloy

Mercury: less than 1000ppm

Hexavalent chromium: less than 1000ppm