... also different materials of rubber flat wahsers, viton washers, silicone washers, EPDM washers, NBR washers, PU washers, NR washers ... , etc.Silicone Insulation Washer SizeMaterialDuro Coloras per your requirementSilicone20~80 Shore Ablack ... mainly used for high and low temperature resistant products(hose, seals), high temperature resistant electric wire and cable ...