ROHS stands for restriction of hazardous substances. This standard ensures the restriction of certain hazardous substances in electrical and electronic equipment. It was released in 2003 by European union.

The substances which are restricted in Electrical and electronic equipment are:

  1. Lead (Pb)
  2. Mercury (Hg)
  3. Cadmium (Cd)
  4. Hexavalent chromium (Cr6+)
  5. Polybrominated biphenyls (PBB)
  6. Polybrominated diphenyl ether(PBDE)