Metallic gaskets cannot be punched out of sheets but are still cheap to produce. These gaskets generally have a much higher level of quality control than sheet gaskets and generally can withstand much higher temperatures and pressures. Metal must be greatly compressed in order to become flush with the flange head and prevent leakage. The material choice is more difficult; because metals are primarily used, process contamination and oxidation are risks. Metallic gasket used must be softer than the flang in order to ensure that the flange does not warp and thereby prevent sealing with future gaskets.

Metallic gaskets cannot be punched out of sheets but are still cheap to produce. These gaskets generally have a much higher level of quality control than sheet gaskets and generally can withstand much higher temperatures and pressures. Metal must be greatly compressed in order to become flush with the flange head and prevent leakage. The material choice is more difficult; because metals are primarily used, process contamination and oxidation are risks. Metallic gasket used must be softer than the flang in order to ensure that the flange does not warp and thereby prevent sealing with future gaskets.