... , Mechanical Seal, Extrusion Seals, Rotating Seals and wearable 1. All rubber products are made according to international standard: ISO 3601, AS ... -N (NBR), HNBR, VITON, Silicone, FluoroSilicone, EPDM, Teflon, Natural Rubber, BUTYL, SBR, Neoprene, HYPALON, etc.Our Company is committed to providing customers ... DVGW certification and British WRAS (WRC) drinking water standard certification. SBR O-Ring