Standard:D2000,ASTM.

It could be made by many kinds of raw materials,such as NBR, SBR,SI,FPM, ACM,EPDM...

 Material:NBR,EPDM,SI,HNBR,ACM,SBR,FPM,FLS,CR,BR,IIR,NR,IR,PU,E/A,ECO,CSM.

O-rings is the simplest parts in the field of seals, its the best and most efficient seals.