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Spiral wound gaskets have to recover under the action of fluctuating loads caused by process fluid pressure and temperature changes, flange face temperature variations flange rotation, bolt stress relaxation and creep
The gasket-sealing element consists of a pre-formed metallic winding strip with layers of a softer,more compressible sealing material which, during compression , is densified and flows to fill imperfections in the flange surfaces when the gasket is seated. The metal strip holds the filler giving the gasket mechanical resistance and resilience.

Type CR Siral wound sealing element Solid metal outer ring used as a centring device and compression stop Used mainly on raised face and flat face flanges General Duties
Type RIR Spiral wound sealing element Solid metal inner ring High pressure temperature capability Male to female flanges General and critical duties
Type CRIR Spiral wound sealing element Solid metal inner & outer ring suitable for high pressure and temperature applications Raised face or flat flanges Prevents turbulence and erosion damage to flange Prevents damage to the gasket bore and inner windings Acts as a heat shield Acts as a corrosion barrier General and Critical Duties