The European Union (EC) and Vietnam has enforced restriction of hazardous substances in Electrical and Electronic Equipment (RoHS) Directive. The electrical and electronic equipment containing lead (Pb), cadmium (Cd), mercury (Hg), hexavalent chromium (Cr6+), polybrominated biphenyls (PBB) and polybominated diphenyl ethers (PBDE) are affected by the Directive.