... NBR, fluorosilicone, Viton (FKM), Viton DuPont and Dow Rubber and Metal Parts Features:1) Available materials: silicone, ... NBR, fluorosilicone, Viton (FKM), Viton DuPont and Dowelastomers, neoprene, HNBR, NBR + PVC, natural rubber, ... , CO, NSF-612) Excellent chemical and physical properties3) Customers' designs and specifications acceptable4) Available in various sizes and colors