• October 22. 2021

The back up ring, also called anti extrusion ring, is aptly named as they do just that: they back-up an O-ring. The purpose of using the backup ring is to prevent the O-ring from extruding into the sealing gap under the system pressure. The structure of the increased back up ring will bear much higher pressure than using the O-ring alone. The profile shape of the back up ring is usually rectangula...

• April 13. 2022

JST makes custom and standard PEEK back-up rings. Custom sizes up to 24” outer diameter. PEEK™ back-up rings are designed to prevent extrusion in elastomer O-ring sealing systems. Elastomer O-rings serve as effective seals for dynamic and static applications in hydraulic and pneumatic equipment systems. A drawback of elastomer O-rings is their tendency to extrude into the clearance of ma...