Back-up ring

Back up rings - support rings

Backup rings or support ring is a rigid thin ring that holds an elastomeric seal or plastic (such as polyethylene) joint in its designed form and in place.

They provide additional resistance support and prevent extrusion of the seal in the housing when it is under pressure. They do not in themselves have a sealing function but support the actual sealing elements.

These are available in a solid ring, spiral ring or split ring, versions in PTFE with or without filler, NBR or PU, POM, PA, PE, etc.