In a sealing application, backup rings provide added extrusion resistance, and prevent damage to O-rings and seals when subjected to high pressures, larger extrusion gaps, and/or high temperatures.
A backup ring is a ring of hard, extrusion resistant material such as high durometer nitrile, Viton (FFKM), or PTFE are just a few materials offered. A back-up ring is designed to fit between the O-ring and the extrusion gap and prevent the extrusion of the O-ring. … If unsure, it is always best to use two backup rings per 1 o-ring.
NCS offers back up rings, contoured back up rings and Teflon (PTFE) Backup rings. We offer PTFE Rings which include Solid (uncut), Single Turn (scarf cut), and Spiral (multi-turn) PTFE Backup Rings.