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 ... choose on your requirement; 2. types of Rubber Oil Seal: TC, TB, TA, SC, SB, SA, VC, VB, VA, KC, KB ... .Delivery:15 working days(as per your order) Combination sealing washer