... for silicone, NBR, fluorosilicone,viton (FKM), viton DuPont & Dow elastomers, neoprene, HNBR, NBR + PVC, natural rubber, SBR, IR, IIR (butylrubber), CR ... (neoprene), SBR, AU, ACM, CO, etc. NSF-61 approved material, meets ... accepted 7) Available in various sizes and colors Insulation rubber mat