When a sheet of material has the gasket shape " punched out" of it, it is a sheet gasket. Dismantling during a redevelopment according to the German TRGS 519 Gaskets come in many different designs based on industrial usage, budget, chemical contact and physical parameters: Most manufacturers of gasket materials will provide or publish the results of these tests. The " hot compression test" is probably the most accepted of these tests. There are several ways to measure a gasket material's ability to withstand compressive loading. One of the more tried and tested is: "The more compressive load exerted on the gasket, the longer it will last". Generally speaking, there are several truisms that allow for better gasket performance. Most industrial gasket applications involve bolts exerting compression well into the 14 MPa (2000 psi) range or higher. One of the more desirable properties of an effective gasket in industrial applications for compressed fiber gasket material is the ability to withstand high compressive loads. Gaskets are normally made from a flat material, a sheet such as paper, rubber, silicone, metal, cork, felt, neoprene, nitrile rubber, fiberglass, polytetrafluoroethylene (otherwise known as PTFE or Teflon) or a plastic polymer (such as polychlorotrifluoroethylene). These joints are known as R-con and E-con compressive type joints. This is typical of some "ring joints" (RTJ) or some other metal gasket systems. Some (piping) gaskets are made entirely of metal and rely on a seating surface to accomplish the seal the metal's own spring characteristics are utilized (up to but not passing σ y, the material's yield strength). Some types of gaskets require a sealant be applied directly to the gasket surface to function properly. It is usually desirable that the gasket be made from a material that is to some degree yielding such that it is able to deform and tightly fill the space it is designed for, including any slight irregularities. However, due to health hazards associated with asbestos exposure, non-asbestos gasket materials are used when practical. Gaskets for specific applications, such as high pressure steam systems, may contain asbestos. Gaskets are commonly produced by cutting from sheet materials. Gaskets allow for "less-than-perfect" mating surfaces on machine parts where they can fill irregularities. A gasket is a deformable material that is used to create a static seal and maintain that seal under various operating conditions in a mechanical assembly.
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Given the potential cost and safety implications of faulty or leaking gaskets, it is critical that the correct gasket material is selected to fit the needs of the application. A gasket is a mechanical seal which fills the space between two or more mating surfaces, generally to prevent leakage from or into the joined objects while under compression.