Liquefied petroleum gas (also called LPG, LP Gas, or autogas) is a mixture of
hydrocarbon gases used as a
fuel in heating appliances and vehicles, and increasingly replacing
chlorofluorocarbons as an aerosol propellant and a refrigerant to reduce damage to the
ozone layer. Varieties of LPG bought and sold include mixes that are primarily
propane, mixes that are primarily
butane, and the more common, mixes including both
propane (60%) and
butane (40%), depending on the season—in winter more propane, in summer more butane.
Propylene and
butylenes are usually also present in small concentration. A powerful odorant,
ethanethiol, is added so that leaks can be detected easily. The international standard is EN 589.
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