A jacketed gasket is make from a soft pliable core inside a metallic jacket as seen in the diagram below.
Metallic Jacket
Almost any metal or alloy that can be found in sheet form can be used as a metallic jacket. As with any material you must consider the fluid you are sealing in order to choose the right material. The metallic jacket is typically 0.016 in. (0.4 mm) to 0.024 in. (0.6 mm) thick.
Filler
Filler material typically used in jacketed gaskets include Flexible Graphite, ceramic, mica-graphite, PTFE and other metals.
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