Hi there,
I found this on Wikipedia...
Main ingredients, from the material safety data sheet, are:
* 50%: Stoddard solvent (mineral spirits, also commonly known as dry cleaning solvent)
* 25%: Liquefied petroleum gas (presumably as a propellant, carbon dioxide is used now to reduce considerable flammability)
* 15+%: Mineral oil (light lubricating oil)
* 10-%: Inert ingredients
I don't know that that's any help, but at least the petroleum gas is no longer used! replacing with the carbon dioxide seems like at least you don't have a bomb in house!