In Simple terms the gasket is a mechanical seal that fills the space between two or more mating surfaces, to prevent leakage from or into the joined objects.
A Gasket will allow for a less-than-perfect mating surface on a machine part and can fill irregularities. Gaskets are Usually produced by cutting from sheet materials.
Most gaskets will be made from a material that to some degree will yield such that it is able to deform and tightly fill the space it is designed for, including any slight irregularities. Some types of gaskets require a sealant be applied directly to the gasket surface to function correctly.
Some gaskets are actually made entirely of metal and rely on a seating surface to accomplish the seal. The metal's own spring characteristics are utilized causing it to seal.
Gaskets are normally made from a flat material, a sheet such as paper, rubber, silicone, metal, cork, felt, neoprene, nitrile rubber, fiberglass or polytetrafluoroethylene.
One of the most desirable properties of an effective gasket with compressed fiber gasket material is the ability to withstand high compressive loads. Most industrial gasket applications involve bolts exerting compression well into the 14 MPa (2000 psi) range or higher. Generally speaking, there are several truisms that allow for better gasket performance. One of the more tried and tested is: "The more compressive load exerted on the gasket, the longer it will last".
Some gaskets are designed to only seal the 2 surfaces and these usually require a gasket sealant applied with the seal.
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