Graphite spiral wound gaskets are composed of metal gear plates or metal mesh plates and expanded graphite particles. They are usually stamped or cut from reinforced graphite sheets by professional gasket cutting equipment. The commonly used internal reinforcing materials for reinforced graphite gaskets include SS304, SS316, tinplate, etc., with a thickness ranging from 0.05 to 0.2mm. The methods include reinforced composite gaskets with punched plates, reinforced composite gaskets with mesh plates, and reinforced composite gaskets with flat plates.
Functional characteristics of graphite composite gaskets: Modified graphite composite gaskets exhibit excellent corrosion resistance, high and low temperature resistance, radiation resistance, superior recovery elasticity, and high toughness. The required preload is less than that of metal gaskets and metal spiral wound gaskets, and the requirements for flange surfaces are not stringent. They are relatively economical gaskets.
When the edge wrapping method is adopted, it can adhere to the excellent functions of the original graphite metal spiral wound gaskets, facilitating easy installation and disassembly without easy damage. Additionally, it can prevent the gasket from being corroded by substances and oxygen in the external air, improving temperature resistance and compression resistance. The structural types of graphite metal spiral wound gaskets have been improved. The structural types of graphite metal spiral wound gaskets are classified as RF, MFM, and TG, suitable for raised face flanges, male and female flanges, and tongue and groove flanges, respectively.
Depending on requirements, RF-type gaskets can be provided with stainless steel or carbon steel inner edges, known as RF-e type. Application scope: Modified graphite composite gaskets are primarily used in various flange connections such as pipelines, gate valves, pumps, pressure vessels, heat exchangers, coolers, generators, gas condensers, exhaust pipes, refrigerators, etc. They can replace asbestos rubber gaskets and iron sheet gaskets in sealing positions.
