Rubber o ring Descriptions:1. Materials: FPM, also HNBR, NBR, SI, EPDM, ACM,PU, SBR, CR, BR, IIR, NR, IR,etc, just as your request.2. Hardness: between 30-90 shore A or IRHD.3. Temperature range: -40~280.4.Performance:oxidation resistant, oil proof, chemical resistant, anti-corrosion, flame...