Jerry No PCBs are used in PCBs :-) However, in FR-4 substrate, a small quantity of some tetrabromobisphenol compound is mixed in with the bisphenol A in the prepolymerisation stage, to render the stuff flame retardant. This tends to render the eco-freaks berserk because they cannot see that there is an environmental advantage in preventing fires from propagating, saving millions a year in fire damage, not to mention loss of life. Brian Jerry Hartman wrote: > Anyone know if any of these chemicals are used in the manufacture of > printed circuit board fabs? > [log in to unmask] > > Polychlorinated Bipenyls (PCBs) or any products from this list: > > Polychlorinated Biphenyls > Polychlorinated Terphenyls > Monomethyl - Dibromo - Diphenyl Methane > Monomethyl - Dichloro - Diphenyl Methane > Monomethyl - Tetrachloro - Diphenyl Methane > > ############################################################## > TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c > ############################################################## > To subscribe/unsubscribe, send a message to [log in to unmask] with following text in > the body: > To subscribe: SUBSCRIBE TECHNET <your full name> > To unsubscribe: SIGNOFF TECHNET > ############################################################## > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional > information. > If you need assistance - contact Keach Sasamori at [log in to unmask] or > 847-509-9700 ext.5315 > ############################################################## ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################