The gas in shaving cream canisters originally contained CFCs but to avoid patent restrictions it was found that gaseous hydrocarbons such as mixtures of propane, butane and isobutane could be used instead of the CFCs.
The gas in shaving cream canisters originally contained chlorofluorocarbons (CFCs) but this substance was increasingly believed to be detrimental to the Earth's ozone layer. Gaseous hydrocarbon propellants such as mixtures of pentane, propane, butane and isobutane could be used instead of the CFCs.