CONTOURED BACK-UP RING
Contoured back-up rings are anti-extrusion devices that are used in both dynamic and static sealing applications. These back-up rings are also useful when mating part clearances are not sufficiently controlled. In either case, they can significantly prolong the O-Ring's operable life. The contoured back-up ring's slightly concave face on one side provides uniform contact with the entire diameter of the O-Ring. Sizes correspond with AS568 O-Rings. Using two back-up rings is recommended whenever possible, even in single-acting applications.
Stock material is 90 durometer nitrile. Temperature range is -40°F to +250°F