The RoHS Directive stands for “the restriction of the use of certain hazardous substances in electrical and electronic equipment“. This Directive bans the placing on the EU market of new electrical and electronic equipment containing more than agreed levels of lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyl (PBB) and polybrominated diphenyl ether (PBDE) flame retardants.
It is closely linked with the Waste Electrical and Electronic Equipment Directive (WEEE) 2002/96/EC which sets collection, recycling and recovery targets for electrical goods and is part of a legislative initiative to solve the problem of huge amounts of toxic e-waste.
Manufacturers need to understand the requirements of the RoHS Directive to ensure that their products, and their components, comply.
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The Reduction of Hazardous Substances (RoHS) regulations set limits for the following substances:
To certify to the above compliances, these substances must not be intentionally added to the product AND cannot exceed the following maximum allowable levels as a trace substance:
0.1% (1,000 ppm) for: Lead*, Mercury, Hexavalent Chromium, PBB and PBDE
0.01% (100 ppm) for: Cadmium
Lead as an alloying element in copper alloys is allowed up to 4.0% (40,000 ppm); in steel up to 0.35% (3,500 ppm) is allowed; in aluminum alloys up to 0.40% (4,000 ppm) is allowed.
Restricted Substance Controls (RSC) defines the actions and mechanisms you can take to prevent restricted substances from inclusion in your products. To ensure RSC are effective, the procedures should be integrated into an overall Compliance Assurance System (CAS).
EU Enforcement authorities and OEM customers are requesting documentation of producer’s RoHS compliance procedures to demonstrate that appropriate systems are in place to ensure on-going compliance.
Compliance procedures should be integrated into your quality management system or environmental management system if one exists.
RoHS Certifiation helps you in developing your ‘Compliance Assurance System’
RoHS restricted substances have been used in a broad array of consumer electronics products. Examples of leaded components include:
Cadmium is found in many of the above components, examples include plastic pigmentation, nickel-cadmium (NiCd) batteries and CdS photocells (used in night lights). Mercury is used in lighting applications and automotive switches, examples include fluorescent lamps (used in laptops for backlighting) and mercury tilt switches (these are rarely used nowadays). Hexavalent chromium is used for metal finishes to prevent corrosion. Polybrominated biphenyls and diphenyl Ethers/Oxides are used primarily as flame retardants.
RoHS (Restriction of Hazardous Substances)
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