Contoured Back Up Ring
Contoured back-up rings are anti-extrusion devices, used in both static and dynamic sealing environments; they are also useful when mating part clearances are not tightly controlled. In either case they can extend the useful lfe of O-rings. Contoured back-up rings have a slightly concave face on one side, enabling uniform contact with the entire diameter of the O-rings they are used with. Sizes correspond with AS568 O-rings. Whenever possible, the use of two back-up rings is recommended, even in single-acting applications.
Stock Material: 90 durometer nitrile
Temperature range: -40 °F to +250 °F