... Standard,:1.JIS B 24012.AS568A3. GB/T3452.11)Rubber O-RING NBR o-ring, EPDM o-ring,viton ... , Siliconeo-ring,FKM o-ringRubber Seal ring,seal circle,rubber seal ring2)AS568, JIS B 2401, Hardnes50-90 SHOREColors ... B 2401 2. AS568A 3. GB /T3452.11)Rubber O-RING NBR o-ring, EPDM o-ring,viton o ... Silicone o-ring,FKM o-ringRubber Seal ring,seal circle,rubber seal ring2)AS568, JIS B 2401, Hardnes50-90 SHOREColors ...