... materials: NR, SBR, BR, NBR, EPDM, IIR, CR, silicone, ACM, FKM (Viton) and more;2) Hardness: as per your request;3 ... tensile strength, elongation, tear resistance, rebound resistance, gas, impermeability resistance, oil and fuel resistance, acid resistance, water resistance;6) Quality certificate ... goal forever. Looking forward to your long term business. Rubber oil seal