Metal Jacketed Gaskets, as the name suggests, consist of a metallic outer shell with either a metallic or nonmetallic compressed fiber filler. The filler material gives the gasket resilience while the metal jacket protects the filler and resists pressures, temperatures and corrosion. They are frequently used with heat exchangers although they are more often replaced with corrugated and grooved gaskets which are best suited to sealing flat surfaces of gas pipes, heat exchangers, cast-iron flanges and autoclaves.
Metal Jacketed Gaskets can be useful when dealing with irregular or faulty flange rims. They require mechanically processed flanges, high bowled loads in a correct alignment in order to provide an efficient sealing. Metallic gaskets can come on different styles like double jacket, single jacket or solid metal. Soft compressible filler material can be flexible graphite, PTFE or non-asbestos compressed sheet type. The design of a metal jacketed Gasket also may require different shapes and styles mentioned above and can be made to a variety. The standard filler is normally sufficient for applications up to 900 Degrees Fahrenheit.
Other soft fillers are available for higher temperatures or special applications. ASME B 16.20 specifies the size and pressure class requirements. Designed requirements include jacket thickness and filler thickness.