Will friction affect the use of O-ring

Friction and wear are important influencing factors of O-ring damage. The degree of wear mainly depends on the size of friction. When the liquid pressure is small, the friction force of O-ring depends on its pre compression. When the working fluid is under pressure, the friction increases with the increase of the working pressure.

When the working pressure is less than 20MPa, the relationship is approximately linear. When the pressure is greater than 20MPa, with the increase of the pressure, the increase of the contact area between the O-ring and the metal surface, which also has an impact on the application of the O-ring, the friction force increases slowly. Under normal conditions, the service life of O-ring will decrease approximately in a square relationship with the increase of liquid pressure. With the increase of friction, a large amount of friction heat is generated between the rotating or reciprocating shaft and the O-ring. Since most O-rings are made of rubber, the thermal conductivity of rubber O-rings is extremely poor. Therefore, the friction heat will cause the aging of the rubber, leading to the effectiveness of the O-ring and damaging its sealing performance. Friction will also cause O-ring surface damage, reducing the compression. Serious friction will soon cause the surface of the O-ring to be damaged and lose its sealing property.

The friction force of O-ring has a great influence on the service life of O-ring to a large extent, so its friction force cannot be ignored when applying O-ring.