Flat metal gasket for seal between cylinder head and exhaust manifold

摘要

Flat metal gasket for forming seal between the cylinder head of an internal combustion engine and an exhaust manifold comprises metal plate(s) (2,3) with sealing faces including corrugations facing outwards, at least one of which (9) carries a coating (10) comprising a pressure-tight material which softens or decomposes at the temperature at which the parts to be sealed operate. During operation, after fitting the and tightening the components on to the gasket, the coating softens or decomposes and the corrugations can relax by the thickness of the coating. Coating is a film, laminated on to the plate and formed from polyethylene or polypropylene.