Aerosol propellant gas is simply a pressurized gas that subsequently used to expel the products and maintain pressure in aerosol cans. The saturated vapour can exist in equilibrium with its liquid, and become immediately evaporating liquid when gas escapes to atmosphere.
Thai Engineering Gas offer several kinds of propellant gases including :
Isobutane or i-butane (also known as R600a)
Odorless propane and butane
Dimethyl ether or DME (also known as Methoxymethane)