Chassis Specifications; RoHS
Restriction of Hazardous Substances
The RoHS standard limits the amount of certain elements used in the manufacture of electronic components. There are six chemicals that are controlled under the standard. These metals include: lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls and polybrominated diphenyl ethers.
The materials are not banned, but limited in concentration. A maximum concentration value of less than 0.1 percent by weight in homogenous materials of lead, mercury, hexavalent chromium, polybrominated biphenyls or polybrominated diphenyl ethers. And a maximum concentration value of less than 0.01 percent by weight in homogenous materials of cadmium.
Lead (Pb); used in Lead Terminal Finishes, Solder. May be replaced by Tin.
Mercury (Hg); is not normally used.
Cadmium (Cd); used in Terminal Finishes. May be replaced by Tin Hexavalent.
Hexavalent chromium (Cr VI); used as a Protective Coatings. May be replaced Trivalent Chromium
Polybrominated biphenyls (PBB); used as a Flame Retardant in plastics.
Polybrominated diphenyl ethers (PBDE); used as a Flame Retardant in plastics
Chassis Thermal Design; Next in designing a chassis
There are Exemptions to RoHS
How To Specify a Equipment Chassis; Index page
