... and steam proof, good insulation property, good elasticity and high tensile strength, etc.3. Hardness: 20-90 shore A. Tolerance is ... , purple, pink, etc.6. Material approved: can be ROHS, REACH, FDA, NSF, UL, etc.7. Style: O ring, X ring, D ... resistant, weather proof, UV radiation resistant, etc. o ring. High tensile EPDM rubber watch o ring