·Introduction
In 1992, leaders of the world held a "Earth Summit" in Rio de Janeiro, Brazil to discuss the crisis caused by the blind pursuit of economic development on the global environment, such as greenhouse effect, ozone depletion and acid rain. The key to the sustainable existence of mankind for generations. Since then, all countries have tried to put environmental protection requirements in their national or regional environmental policy, the Government has introduced increasingly stringent environmental protection measures, requiring environmental protection and economic growth play a pivotal business, must take its due environmental and social responsibility . February 13, 2004, the European Union issued "on the use of electrical and electronic equipment in the Prohibition of Certain Hazardous Substances Directive" (referred to as RoHS), such as cast a blockbuster, causing a global wave of green.

·What is the RoHS directive?
RoHS Directive (Directive 2002/95 / EC of the European Union):
The full name of "electrical and electronic equipment in the Restriction of the Use of Certain Hazardous Substances Directive", the directive requires the EU market of electrical and electronic products shall not contain lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, polybrominated diphenyl ethers and other harmful substances（ROHSThe Restriction of the use of certain Hazardous Substances in Electrical and Electronic Equipment）。