... OEM rubber sealing products 1.Material advice 2.Nonstandard, custom-made 3.Meet SGS,FDS,ROHS,NSF 4.OEM/ODM OEM rubber sealing products ... Good factory for rubber seal ring features:1. Materials advice: silicone ... and rubber (EPDM, also NBR, SI, HNBR, SBR, CR, BR, ...