Corrugated Metal Gaskets (CMGs) are gaskets that we see a lot in heat exchangers where we see plenty of radial shear. Typically, we suggest the use of Kammprofile Gaskets in heat exchanger applications, but but because of the volume of use that we see in applications, we’re going to cover the details of Corrugated Metal Gaskets.
Corrugated Metal Gaskets can be used in specialty flanges such as heat exchangers. Still, CMGs should not be used in piping flanges (standard ANSI flanges) without proper engineering consideration. Even with engineering consideration, we still suggest using better sealing products such as spiral wounds or kammprofile gaskets instead of corrugated metal gaskets!
They’re a sheet of metal that’s manufacturers corrugate to make the corrugated metal core. The gasket should be used with a soft facing which essentially means flexible graphite (that’s what the gasket companies call it, we call it graphite), or another filler material like PTFE on each side.
The corrugated metal core can be made with regular gasket materials such as carbon steel, 304 stainless steel, 316 stainless steel (if you need to go to higher temperatures), and other high-temperature materials.
The filler material typically has a have graphite facing. Other non-asbestos fillers can be adapted to this gasket, but in petrochemical applications, we only see the graphite facing.
While we are not overly familiar with the use of corrugated metal gaskets outside of petrochemical applications, many companies state that these are also made with compressible sealing elements designed to resist high temperature, corrosive chemicals, and thermal cycling.
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