Propane is a hydrocarbon fuel refined from crude oil. It is sold bottled as a fuel for cutting steel, brazing, cooking and heating. When blended with Butane and other hydrocarbons, it is referred to commercially as LPG.



Propane is used as fuel in steel cutting, brazing, heating, cooking on barbecues, patio heaters, portable stoves, and in motor vehicles. Propane powers some buses, forklifts, and taxis and is used for heat and cooking in recreational vehicles and campers.

Physical Properties

Gas Propane
Chemical formula C3H8
Molecular weight 44
Gas density 1.83 Kg/m3
SG vapour 1.5
Boiling point -42.1°C
Critical temperature 97°C
Critical pressure 42 bar


Propane is mostly refined from crude oil. It is liquefied under pressure and transported in tanks and then filled into cylinders for use as a fuel.


Propane is highly flammable and in high concentrations may cause asphyxiation and death. As it is heavier than air, it accumulates in confined spaces especially at low levels. In low concentrations propane may cause narcotic effects. Symptoms may include dizziness, headache, nausea and loss of co-ordination. For more detail on the hazards associated with helium check the Safety Data sheet.

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