PEEK Back Up Rings

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.

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.

PEEK Back-up Rings material

Virgin PEEK

• Engineered thermoplastic.
• PEEK can be used up to 480℉.
• 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.