This is the second of two articles in this “Back to Basics” series that discusses gasketing. While the first article was on soft gaskets, this article will focus on semi-metallic gaskets.
Many variations of semi-metallic gaskets are available. In general, the combination of metal and a soft material merges the structural integrity of the metal with the sealing ability of the soft material. Common variations include corrugated, jacketed, kammprofile and spiral-wound gaskets.
Corrugated gaskets consist of a thin metal that is corrugated or embossed with concentric rings and faced with a soft material such as flexible graphite.
Corrugated gaskets use the substrate’s geometry to achieve conformability to flange irregularities and promote recovery over the life of the seal; they are essentially a line contact seal.
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