Structure for generating nitrogen gas for inflating an air bag vehicle occupant restraint comprises a grain made of an azide based material which generates gas upon combustion. The grain has an ignition enhancing coating thereon consisting essentially of 20 to 50% by weight of an alkali metal azide,...http://www.google.es/patents/US4698107?utm_source=gb-gplus-sharePatente US4698107 - Gas generating material
