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.

Gaskets allow for less-than-perfect mating surfaces on machine parts where they can fill irregularities. Gaskets are commonly produced by cutting from sheet materials.

Gasket materials are chosen for their characteristics and capability to withstand a number of environments such as mining and deep sea, resistance to chemicals, alkaline acids, extreme temperatures, and pressure.