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 mating surfaces with increasing pressures and temperatures. Higher temperatures impose a severe burden on the physical and mechanical properties of elastomer O-rings, which further increases their tendency to extrude. The combination of high pressures and high temperatures is a common occurrence in fluid systems. This establishes the need for the back-up ring in preventing O-Ring extrusion.

JST makes various types of PEEK™ back-up ring designs.

PEEK back-up rings material

Virgin PEEK™

● Engineered thermoplastic.

● PEEK™ can be used up to 480°F.

● Excellent chemical resistance.

● Very low moisture absorption.

● Good wear and abrasion resistance.

Glass filled PEEK™

● PEEK™ with the addition of glass fibers.

● Glass fibers reduce the expansion rate and increase the flexural modulus.