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The spiral wound gasket is semi-metallic, comprising of a spirally wound v-shaped stainless steel strip and a non-metallic filler material, such as graphite or PTFE. Also on the gasket, is a solid outer ring used for centering and controlling compression
To access the standard for spiral wound gasket ASME B 16.20 please click here
Spiral-wound gaskets containing PTFE filler, PTFE-blended gasket, copper jacketed-gasket, and solid-metal flat gasket are recommended.
Note: When filler is foamed carbon or PTFE, gaskets with inner and outer rings are recommended.
Note: When fluid is monomer, gaskets with inner and outer rings are recommended.