... weather aging Good elasticity Description of High Tensile Strength Oil Seal:1. Materials: can be NR, HNBR, MVQ, ACM ... CR, SBR, SI, BR, IR, EPDM, IIR, PU,E/A, ECO, CSM, VITON, FKM, FPM, etc.2. Characteristics: ... chemical properties.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: ...