Know the common knowledge of an O-ring

The O-ring section is basically a circular sealing ring, so it is called an O-ring or a gasket. It is mainly used to prevent the leakage of fluid inside the mechanical device and the intrusion of foreign objects from the outside. It is an extrusion-sealed sealing product with a large output and a wide range of uses, so it is extremely popular.

O-rings can be used freely under static and dynamic conditions, as motion seals, skills for reciprocating, swing seals and rotary seal systems; as fixed seals, can be used as gaskets, and are the most popular among general pneumatic and hydraulic components. Common sealing parts. At present, the variety and specifications of O-rings actually used range from as small as less than 1 centimeter to as large as tens of meters, and there are tens of thousands of them in total.

Working conditions of the sealing ring:

Generally, the operating temperature of common O-rings is in the range of -60~260 degrees Celsius, the pressure can reach 25-40 MPa, the hydraulic deformation range is 15%-30%, and the reliable working time is more than 3000 hours.

Required resistance of the sealing ring:

When used in a static state, it is required to have aging resistance, ozone aging resistance, oil resistance, chemical resistance, compression deformation resistance, creep resistance, cutting resistance, and tear resistance. When used as a sports seal, in addition to the above properties, issues such as wear resistance and friction performance must also be considered.

Material selection analysis of sealing ring:

Therefore, O-rings have very strict requirements on the selection of rubber materials, and must ensure good mechanical properties and other additional properties. For pneumatic components, nitrile rubber, styrene-butadiene rubber and ethylene propylene rubber are mostly selected; for hydraulic pressure The sealing elements are usually nitrile rubber, hydrogenated nitrile rubber, acrylic rubber, neoprene and vinyl silicone rubber, fluorosilicone rubber and fluororubber;