Butane is a propellant used to dispense a product from a container. It is often used in concert with other propellants such as Isobutane and Propane. While butane is commonly known for its use in heaters and lighters, in use as a propellant its energy comes from being compressed in a can rather than from being lit or heated. Butane is one of the hydrocarbon propellants we used to replace the chlorofluorocarbons (CFCs) that were previously used in aerosol products and which were ultimately shown to be damaging to the ozone layer. SC Johnson eliminated the uses of CFCs back in 1975, three years before the government required companies to do so.