 PCBs readily penetrate skin, PVC (polyvinyl chloride), and latex (natural rubber).PCB-resistant materials include Viton, polyethylene, polyvinyl acetate (PVA), polytetrafluoroethylene (PTFE), butyl rubber, nitrile rubber, and Neoprene.PCBs are derived from biphenyl, which has the formula C12H10, sometimes written (C6H5)2.