An irritant aerosol spray container has an opening into which a valve assembly fits and a gasket is positioned between the valve assembly and the container such that the portion of the gasket in communication with the interior of the container is substantially free of material extractable by halocarbon...http://www.google.es/patents/US4582228?utm_source=gb-gplus-sharePatente US4582228 - Irritant aerosol spray
