Impregnated flat gasket and method of producing the gasket

摘要

An impregnated flat gasket useful as a cylinder head gasket for an internal-combustion engine, includes a fiber mat comprised of from about 2 to about 20 weight percent of a synthetic organic fiber; from about 10 to about 70 weight percent of a first inorganic filler which has a grain size having a maximum of 0.01 mm and which has a specific surface area having a maximum of 30 m2/g; from about 10 to about 70 weight percent of a second inorganic filler which is composed of particles having a shape which is one of needle-shaped and globular, which has a grain size having a maximum of 0.01 mm and which has a specific surface area ranging from 50 to 350 m2/g; from about 0.5 to about 1 weight percent of zinc oxide; and from about 3 to about 10 weight percent of a nitrile butadiene latex. The impregnated fiber mat material can be punched into gasket blanks without problems.