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Spiral Wound Gaskets are made with an alternating combination of a preformed engineered metal strip and a more compressible filler material which creates an excellent seal when compressed. The engineered shape of the metal strip acts as a spring under load, resulting in a very resilient seal under varying conditions. The strip metallurgy and filler material can be selected to seal a wide range of applications. All Class 150 & 300 SWG styles have been engineered to precise manufacturing tolerances and utilize optimal winding density that allow for lower stress (bolt load) sealing compared to conventional spiral wound gaskets thus eliminating the need to stock both standard and low stress SWG’s.
Style DRI
Sealing element (D) combined with a centering ring (R) and an inner ring (I) which improves radial strength and protects the sealing element from erosion and inward bucking. Commonly used with standard raised face and full face type flanges. In accordance with ASME B16.20-2012, inner rings for all gaskets are recommended for all sizes, materials and classes
Application
The engineered shape of the metal strip acts as a spring under load, resulting in a very resilient seal under varying conditions. The strip metallurgy and filler material can be selected to seal a wide range of applications.
Composition
SWGs obtain their initial seal with very low seating stresses and provide a tighter seal than typical low stress spiral wound gaskets and other high temperature alternative gaskets. Our advanced manufacturing process allows all SWGs to perform better under low bolt stress applications while maintaining seal integrity under normal conditions.
Mica-graphite filled spiral wound gaskets are made with graphite filler layers surrounded by pure mica filler layers. This construction method enhances gasket performance in many ways without the added expense of special filler materials offered by competing brands.
Traditional mica-graphite filler is only a blend of graphite and mica materials which only moderately improves upper temperature limits over conventional graphite filler.
Advantages:
- Pure mica layers protect graphite from rapid oxidation at high temperatures up to 760°C (1,400°F)
- Mica offers enhanced fire protection
- Eliminates the need for many high-temperature and high-cost specialty gaskets
