Back-up rings

Back-up rings prevent the extrusion of an elastomeric O-ring in its housing groove under certain operating conditions.

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Back-up ring materials

Back-up rings are typically manufactured in virgin PTFE. Other filled PTFE and Plastics are also available depending on the application. They are also available in NBR and Viton 90.

PTFE is a strong and durable material, making it ideal for back-up rings. It is also resistant to many chemicals and can withstand high temperatures. This makes PTFE back-up rings an excellent choice for use in a wide range of applications.

Spirals

Spiral back-up rings enable the back-up ring to be opened with ease for fitting over a shaft, and ensures the O-ring is supported around its entire diameter. Spiral backup rings are manufactured in a coiled spiral shape.

Solid/Solid splits

Solid single turn back-up rings are usually endless to ensure good support. However, they can be scarf split if required.

Contoured Rubber/Par Backs

Contoured Back-Ups are typically produced in a 90 durometer Nitrile and Viton. This provides sufficient elasticity to permit stretching over the major diameter of a piston and then snapping back into the gland groove cut into the piston. 90 durometer has sufficient hardness to resist extrusion of the softer elastomeric O-Ring performing the actual sealing function against the high-pressure liquid or gas.

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Download catalogue

Catalogue	Summary
Download	Download the O-ring catalogue for detailed information about materials, assembly instructions and full dimensions lists.