Standard Back Up Ring

Used primarily as an anti-extrusion device, standard back-up rings are used in both static and dynamic sealing. Made of materials that are resistant to pressure induced flow, the back-up ring keeps a seal from extruding into the clearance gap between mating parts.

RT/Dygert's standard Hytrel® back-up rings are equivalent to AN6224, AN6246, MS28774, MS28782, and MS28783 specifications.  The PTFE back-up rings are specifically cut to MS28774 specifications.  Both types of back-up rings share a common rectangular cross-section.

Stock Materials: PTFE & Hytrel

Temperature range: -100 °F to +400 °F for PTFE
                                  -60 °F to +275 °F for Hytrel®