2,4,5,2',4',5'-Hexabromobiphenyl 67774-32-7 CCRIS 312 Firemaster FF-1 Firemaster FF-1, technical grade [Polybrominated biphenyls] HSDB 7064 Hexabromobiphenyl, technical grade [Polybrominated biphenyls] PBB POLYBROMINATED BIPHENYLS Polybrominated biphenyl Polybrominated biphenyl (FF-1) Polybrominated biphenyl mixture