... (FKM), viton DuPont & Dow elastomers, neoprene, HNBR, NBR + PVC, natural rubber, SBR, IR, IIR (butylrubber), CR (neoprene), SBR, AU, ACM, CO ... mold support and samples 6) Customer's design and specifications are accepted 7) Available in various sizes and colors Foam rubber seal ring