PU o ringdescriptions:1. Materials:PU, also HNBR, NBR, SI, EPDM, ACM,SBR, FPM, CR, BR, IIR, NR, IR,etc, just as your request.2. Hardness: between 40-90 shore A or IRHD.3.Performance:high hardness, good elasticity, high tensile strenght, good tear proof, wear resistant, good tensible strength, heat...