Description
A backup ring is a ring of hard, extrusion resistant material such as high-durometer Nitrile, Viton® (FKM), or PTFE. A backup 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 one o-ring.
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.
Extrusion failure is one of the most common types of o-ring failure. When the internal pressure of an application becomes too great, the o-ring will actually extrude into the clearance gap. This extrudate will quickly be nibbled away causing a loss of material, and once sufficient material is lost, seal failure will quickly follow.
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