Brominated Flame Retardant 2
Brominated Flame Retardant 2 : Types of Compounds: Many different BFRs are produced synthetically with widely varying chemical properties. There are several groups: (a) Polybrominated diphenyl ethers (PBDEs): DecaBDE, OctaBDE (not manufactured anymore), PentaBDE (not manufactured anymore, the first BFR, commercialized in the 1950s); (b) Polybrominated biphenyl (PBB), not manufactured anymore; (c) Brominated cyclohydrocarbons. Decabromodiphenyl ether (Deca-BDE or DeBDE) - In August 2012, the UK authorities proposed decabromodiphenyl ether (Deca-BDE or DeBDE) as a candidate for Authorisation under the EU's regulatory regime on chemicals, REACH. Hexabromocyclododecane (HBCD or HBCDD) is a ring consisting of twelve carbon atoms with six bromine atoms tied to the ring. The commercially used HBCD is in fact a mixture of different isomers. HBCD is toxic to water-living organisms. Studies carried out on a HBCD product that is no longer manufactured indicate that humans can develop allergy at skin contact. This is not the case anymore with the current HBCD-based products. Tetrabromobisphenol A (TBBPA or TBBP-A) is regarded as toxic to water environment. This flame retardant is mainly used in printed circuit boards, as a reactive. Since TBBPA is chemically bound to the resin of the printed circuit board, it is less easily released than the loosely applied mixtures in foams such that an EU risk assessment concluded in 2005 that TBBPA poses no risk to human health in that application. However given the current state of waste disposal in the world, the BFRs are released into the environment and bioaccumulate. TBBPA is also used as an additive inacrylonitrile butadiene styrene (ABS)
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