Gasket VS O-ring

Wed May 22, 2024


Gaskets and O-rings are two common types of seals that are widely used in fast-moving industries, they are both used to stop the leakage of liquids, gases, or other media, but there are a few more differences between them and if you don’t understand the differences you may choose incorrectly, this post will help you understand the similarities and core differences that will help you to make a better choice of sealing solutions.

What is a gasket?

Gasket is designed to act as a seal between two surfaces, preventing extrusion and providing support. They are generally flat or slightly curved seals, mostly round, and can be made to fit various shapes and sizes of sealing surfaces, depending on the shape of the sealing surface.


What is an O-Ring?

O-rings are round seals used to form a seal around a round object. They are usually made of rubber or other elastomeric materials and designed to fit snugly around the object they are sealing. O-rings are usually used in applications where the pressure is high, or the seal needs to be very tight for static sealing and reciprocating motion.


Gaskets are the same as O-rings:

Gaskets and O-rings are sealing role; when the sealing contact pressure is greater than the pressure of the medium to be sealed, O-ring compression is formed to prevent the leakage of liquids or gases to achieve the sealing effect;
If the seal contact pressure is less than the pressure of the medium to be sealed, the gasket or O-ring is open, allowing liquid or gas leakage.
Gaskets and O-rings are made of flexible materials; gaskets can also be made of more complex materials, such as rigid polymer or metal.

Gaskets differ from O-rings:

The main differences between O-rings and gaskets are their shape, application, and performance in sealing.

Shape: O-rings are round or annular in appearance, requiring a groove, and are used to seal on cylindrical or round surfaces, whereas gaskets are usually flat or slightly curved and are used in applications where the surface to be sealed are irregular or where gaps need to be filled.

Applications: O-rings are typically used in applications where pressures are high, or the seal needs to be very tight, such as in dynamic applications like hydraulic cylinder pistons. They maintain a seal even when stationary or in motion. In contrast, gaskets are typically used in applications where the surface to be sealed is stationary, such as pipe flanges, bearing glands, etc., and come in various forms and materials.

Comparison of sealing performance: O-rings have excellent sealing performance and are effective in stopping leaks in both planar and radial directions. Gaskets, on the other hand, provide a more convenient and economical solution in specific situations, such as oil leakage problems when sealing in the plane of a pipe joint, where it may be necessary to replace the O-ring or adjust the tightening force to achieve the effect of preventing leakage.

In summary, O-rings and gaskets each have their unique advantages and applications. When choosing whether to use O-rings or gaskets, you must decide according to the specific application scenarios and working conditions to achieve the best sealing effect.

TYS Back-up
TYS Back-up

TYS gaskets(also call back-up ring) are mainly designed for hydraulic seals, with material choices such as Viton, nylon or PTFE, POM, etc. They are used for support or anti-extrusion and are used in conjunction with the main seal on piston seals or rod seals to extend the service life of the main seal. If you need to use gaskets or O-rings, you can contact us at any time to help you.

Related articles

Hot Search Terms