Improved gasket for an aerosol valve stem

摘要

An improved valve stem gasket comprising a flat-shaped gasket with a central aperture wherein the durometer of the gasket varies from a relatively low hardness value in the inner portion of the gasket extending radially outward from the central aperture to a relatively higher hardness value at the radially outer portion of the gasket whereat the gasket will be contacted by the upper wall portion of the valve housing. In a preferred form of the gasket, the variation in durometer value will be gradually varied from the inner portion of the gasket to the radially outer portion of the gasket.