... ring, viton o ring, etc. Rubber o ring descriptions: 1. Materials: FPM, also HNBR, NBR, SI, EPDM, ACM,PU, SBR, CR ... : -40~280. 4. Performance: Heat resistant, oxidation resistant, oil proof, chemical resistant, anti-corrosion, flame resistant, ozone resistant, weather proof, radiation resistant,etc. 5. Color,size and ...