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There are many variations of semi-metallic gasket available in today's market. The combination of metal and a soft gasket material merges the sealing ability of the soft material with the structural integrity of the metal.
The most common styles of semi-metallic gasket include spiral wound gaskets, corrugated, jacketed, and kammprofile gaskets.
Pumps & Systems magazine outlined the proper way to select a semi-metallic gasket.
Gasket selection suggestions
Choosing a gasket depends on a few different factors: operating conditions, fluid compatibility, mechanical features of the joint