... eg:TC,TB,SC,SB... 2.Material: EPDM,Silicon,FPM,NBR.. 3.ISO9001: 2000 4.Durable 1. Several material for Oil Seal ... ,Rubber O-Ring,Rubber Ring Seal and Rubber Gasket like: NBR, HNBR, CR, PDFE, EPDM, SILICONE, VITONE, etc. Can choose on ... , KA, DC, DB etc, also can make on your demand; 3. Many types of O-Ring: O-type, E-type, U ...