A gasket and packing material

A gasket and packing material which we can call gasket pack exhibits excellent adhesiveness to substrates and resistances to degradation of properties when exposed to hot hydrocarbon oils and coolants such as used in an automobile radiator are made by curing a composition which contains polydimethylsiloxane, an organopolysiloxane having R'3 SiO0.5 and SiO2 units or R'3 SiO0.5, R'2 SiO, and SiO2 units, an inorganic filler, an alkoxysilane adhesion promoter, and a ketoxime silicon compound cross linker.

A number of fixed-shape materials are used in the art as gasket and packing materials, for example, cork, asbestos paper, semimetallics, cork rubber, etc., for use in the automobile industry, electrical machinery and appliance industry and machine industry. However, these fixed-shape gasket and packing materials are expensive, their inventory control is troublesome, and they cannot be used for parts in which three surfaces meet.

However, gasket and packing materials which called gasket pach formed from the aforesaid silicone rubber compositions suffer from a poor resistance to hot hydrocarbon oils, for example, engine oil and gear oil, and from a poor resistance to the cooling liquid used as radiator coolant. As a consequence, oil and coolant leaks develop during long-term use, and the demands which must be fulfilled by a gasket/packing material are not fully satisfied as a result.http://www.seekpart.com/fasteners/gaskets/gasket+pack.html