The anti-extrusion rings are mounted side-by-side to prevent extrusion in the presence of high pressures.
The thermoplastic materials used to make the anti-extrusion rings are the same as those used for rigid inserts.
The profile can be developed with a rectangular section or with an inner radius.
The dimensions must be carefully evaluated, as the diameters and the thickness have a substantial relevance for their efficiency.
The o-ring can be protected by one or two anti-extrusion rings.