O-rings are one of the most common seals used in machine design because they are inexpensive, easy to make, reliable, and have simple mounting requirements, They can seal tens of megapascals of pressure.

The O-ring may be used in static applications or in dynamic applications where there is relative motion between the parts and the O-ring Dynamic examples include rotating pump shafts and hydraulic cylinder pistons.

In daily life,there are a lot types of rubber oring.They can be freely produced by different rubber material,such as EPDM,SILICONE,VITON(FKM),NBR,SBR etc.Meanwhile the hardness,color and size also can be different.So we can find the large oring and small oring in someway.As you know rubber oring is easy to produce,so you can freely choose o ring dimension.International standard size and special size are both welcome for you.

Chinese type o ring dimension has a kind of cross section which is round (or O), its role is largely sealed, such as gas seal, water seal, oil seal, etc.There are two ways of the specifications of the o-rings tag:

1,inner ID (inner diameter) * line diameter CS (cross section)

2,ID(inner diameter)* OD(outside diameter)

Performance of EPDM O Ring: 
1,Good weathering resistance (apply to indoor and outdoor),ozone resistance, water resistance,chemical resistance resistance to high temperature steam; 
2,Good impermeability to gasof EPDM O Ring 
3,EPDM oringis not recommended for food usage or exposure to aromatic hydrogen. 
4. All manufacturing processes confirm to the ISO-9001 standards. 
5. Good shock-proof, heat insulation and sound insulation performance. 
6.The specification,packing requirement and the color can be customized according to customer's drawings or samples. 
Application of EPDM O Ring: 
1,Sealings for enviroment of high temperature steam. 
2,The rubber parts for braking system. 
3,Sealings or parts for Sanitary and Bathroom Equipment. 
4,Sealings for radiator in auto radiator. 
7)For car and truck engine sealing. 
Production Details