... structure:TC, TB, SC,ect 4.certificate:ISO2001 teflon flat washer describle:1. Material: teflon,NBR, SILICONE, VITON,HNBR, CR, PTFE, EPDM ... Seal, O-Ring, Rubber Seal, Rubber Gasket, Rubber Ring, Sealing Ring, Sealing Gasket.9. Manufacture Process : Heading/washer assembly/Threading/Secondary machine ... ,Nipure teflonreinforced teflonglass fiber,etc.8~200mm≤10.0Mpa200°c teflon flat washer