... the main function is sealed, such as a gas seal, water seal, oil seal etc. O-rings enquiries parameters: material, size, ... , purchase quantity, etc. Item nameO RINGMaterialNBR,HNBR,SBR,EPDM,FPM,SILICONE,VITON,NR,CR, PU etcSizeCustomized /standard /nonstandardsuch ... technology, stable quality. e). Good Material stability, excellent seal results.f). High and low temperature resistance, oil resistance, ...