Our product material includes: VITON, EPDM,SILICONE, NBR, HNBR， CR，HYPOLAN and NR, etc. LONGRUN has strong development and manufacturing experience, as well as capability to produce non-regular shaped and O ring rubber products. Our product range covers standard industrial product as well as products based on ASTM D2000，JISB 2401，BS903 and DIN3771, such as O Ring,Back Up Ring, X Ring, Wash Seal, Gasket, Rubber damper, Grommet, Rubber Boned metal part, Bumper, Tube, Valve Stem Seal and Piston Seal, etc....