... OEM/ODM rubber washer gasket1.ISO Certification 2.Material:NBR,NR,Silicone,FKM etc 3.Precisely mold design 4 ... SBR, SI, BR, IR, EPDM, IIR, butyl, PU, E/A, ECO, CSM, VITON, FKM, FPM, etc. 2. Characteristics: good ... washer, etc. 3. Hardness: 30~90 shore A or IRHD as your request, tolerance is ± 5 shore ... A, and can be ±3 shore A for special products. 4. Size tolerance: ...