What is the Difference between Static and Dynamic O-rings?

Aug 21, 2015 FDA O-Rings

O-rings are used for effective sealing in applications. Mostly, they are used to help repair or correct any manufacturing or installation defects seen in glands. O-rings can be used in static as well as dynamic applications. The make of both these O-rings will be different owing to the difference in application requirements. This post will look at the major differences between static and dynamic O-rings.

Major Differences between Static and Dynamic O-rings :

The following are some major differences between static and dynamic O-rings:

The material used to manufacture dynamic O-rings should be tougher than that used to manufacture static O-rings. This is because the dynamic O-ring will have to undergo movement while the application is functioning.
In dynamic applications, the surface finish and material of the gland should be such that it doesn’t abrade the O-ring during movement. Otherwise, the O-ring could tear. This is irrelevant in static applications, where the O-ring doesn’t move.
O-rings used in dynamic applications are likely to wear at a faster rate as compared to static O-rings. This is because dynamic O-rings are constantly moving. Hence, the interval of maintenance procedures for dynamic O-rings should be shorter than that of static O-rings.
All O-rings should be properly lubricated at all times. Dynamic O-rings require more lubrication than static ones.

Depending on the application, static or dynamic seals will be used. O-rings are useful in a varied number of industries and applications. They are effective across a wide range of temperatures and pressures. However, using the right O-ring for each application will help you increase the reliability and service life of the O-ring. You can consult with your O-ring manufacturer on the best fit for your application.