PTFE Cap Seals

The Cap Seal consists of a ring of PTFE positioned on either the OD or ID of an O-Ring energiser.

These seals are designed to offer low friction, bi-directional, sealing and can normally be installed in a closed type groove.

This type of seal can combine a variety of elastomeric and thermoplastic material properties to allow a wide range of application parameters to be catered for.

If you have a specific application that you would like us to look at then please download & complete our Application Datasheet and send it to us at

Features & Benefits


Designed to install into single piece groove

Reduced dynamic & break out friction compared to standard O-Rings

Stability provided by the cap geometry

Various materials can be combined suiting the seal to the application



As dynamic seals

Typically in reciprocating applications, where friction is a concern