Back-up Rings are flat, split, spiral or contoured washer type fittings used to protect an O-Ring seal from extrusion at higher pressures and temperatures. A Back-up Ring works by blocking or reducing the extrusion gap, thus preventing the o-ring from extruding.

Polytetrafluoroethylene (Pure PTFE) is temperature and chemical resistant white colour material popular as back-up ring. It is resistant to most chemicals including acids, bases, oils, steam and other chemicals.

ID = 45mm
OD = 50mm
Thickness = 2.7mm

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