STANDARD BACK-UP RING
Primarily an anti-extrusion device, the standard back-up ring is used in both dynamic and static sealing applications. Its materials are resistant to pressure induced flow and back-up rings prevent a seal from extruding into the clearance gap between mating parts.
PSP’s standard Hytrel® back-up rings are equivalent in specifications to AN6224, AN6246, MS28774, MS28782, and MS28783. PSP’s back-up rings feature a scarf cut, which facilitates installation. They’re machined precisely to MS28774 specifications. Both back-up ring models share a common rectangular cross-section.
Stock Materials are Hytrel® and PTFE. Temperatures range from 300°F to +500°F for PTFE and -60°F to +275°F for Hytrel®.