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 ... A tolerance.8. High QA/QC system: excellent chemical and physical property, high/low temperature resistance, oil and fuel, water, ...