Main Rubbers
                    NR - Natural Rubber.
                    IR - Polyisoprene.
                    SBR - Butadiene-Styrene.
                    BR - Cispolybutadiene Synthetic Rubber.
                    IIR - Butyl.
                    EPDM - Ethylene-Propylene Diene Monomer.
                    NBR - Nitrile Butadiene Rubber.
                    CM - Hypalon Chlor Sulfonated Methylene.
                    CR - Chloroprene.
                    MQ - Silicone.
                    FKM - Viton.