Seal Washer: 1.Material:copper,steel,rubber 2,Temperature:-60 to 500C ... .Standard:JIS,UNI,DIN,ASTM,GB 4.Samples free Seal Washer :1. Material: NBR, SILICONE, VITON,HNBR, CR, PTFE, EPDM, etc ... .Material:Carbon steel,45#,65Mn,stainless steel,brass,copper4.Finish:Plain;black; zinc plated(Cr,3+);zinc plated(Cr,6+); hot ... .Delivery:15 working days(as per your order) Combination sealing washer