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Propane, butane & LPG

Propane is a gas compressed under pressure to a liquid and is colourless, odourless and flammable. Propane is heavier than air.

Propane has a lower boiling point (-42 °C) than butane and is therefore stored under a higher pressure. The boiling point of butane is about -0,5 °C, it is thus not usable in colder circumstances around this temperature.

Physicochemical constants

Symbol C3H8
Average molecular weight (g/mol) 44.01
Density of the gas (kg/m3 at 1,013 bar and 0 °C) 2,01
Relative density of the gas (air=1) 1.56
Boiling point -42.1 °C
Critical temperature 96.7 °C
Vapour pressure (bar at 20 °C) 8.367
Self-ignition temperature 2.2 - 9.5

1 litre liquid propane releases 270 litres gas at 15 °C and 1 bar.

Application areas

Safety information

See the safety information sheet (SDS) nr: 104 (gas compressed to liquid gas