... seal,silicone gasket 2silicone o-ring is widely used in medical treatment Silicone o-ring 1)100% food-grade silicone 2) silicone seal,silicone gasket,silicone o-ring ... 1) AS-568, PG standard and non-standard Silicone O-rings2) Various colors available, such as black, green, yellow ... viton(FKM), neoprene, HNBR, NBR+PVC, NBR, natural rubber, SBR, IR, IIR(butyl rubber), CR (neoprene), EPDM, SBR, AU, ACM, ...