Restriction of Hazardous Substances RoHS is a mandatory standard set out by European Union legislation. Its full name is the Directive on the Restriction of Certain Hazardous Substances in Electronic and Electrical Equipment. The standard has been officially implemented since July 1, 2006, mainly used to regulate the material and process standards of electronic and electrical products, so that it is more conducive to human health and environmental protection. The standard aims to eliminate lead, mercury, cadmium, hexvalent chromium, polybrominated biphenyls and polybrominated diphenyl ethers (PBdes) from motor and electronic products, and specifically stipulates that the content of lead should not exceed 0.1%.

Scope of RoHS:

Including incandescent bulbs and light sources for home use.

Excluding: medical equipment or monitoring equipment (WEEE Directive Category 8,9); Maintenance spare parts placed on the market before 1 July 2006; Reuse products originally placed on the market before 1 July 2006.

· Heavy metal:

-- Mercury;

- Chromium (VI) Chromium 6.

Polybrominated biphenyls (PBB's);

The maximum limit indicators are:

· Lead, mercury, hexavalent chromium, polybrominated biphenyls, polybrominated diphenyl ethers: 0.1% (1000ppm).

RoHS is for all electrical and electronic products that may contain the above six harmful substances in the production process and raw materials, mainly including: white household appliances, such as refrigerators, washing machines, microwave ovens, air conditioners, vacuum cleaners, water heaters, etc., black household appliances, such as audio and video products, DVDS, CDS, TV receivers, IT products, digital products, communication products, etc. Power tools, electric toys, medical electrical equipment.

2. Mercury (Hg) Examples of the use of this substance: thermostats, sensors, switches and relays, light bulbs

4. Hexavalent chromium (Cr 6+) Examples of the use of this substance: metal corrosion coating

6. Polybrominated diphenyl ethers (PBDE) Examples of the use of this substance: flame retardants, PCBS, connectors, plastic casings

Principles of testing

· Four harmful metal elements should be tested for metal materials, such as Cd, cadmium, Pb, lead, Hg, mercury, Cr6+ hexavalent chromium.

· At the same time, packaging materials of different materials should be tested separately for heavy metals (94/62/EEC).

Cadmium: less than 100ppm

Less than 3500ppm in steel alloys

Less than 40000ppm in copper alloys

Hexavalent chromium: less than 1000ppm