Propane

Propane is the primary aerosol propellant in many car-care and household aerosol products. It liquefies under the pressure inside the can and vaporizes as the valve is opened, driving the liquid contents out as a spray. In conjunction with butane, it provides consistent spray pressure across a range of temperatures. The H280 classification (compressed gas) and H220 (extremely flammable gas) apply to the propellant fraction specifically. There are no inhalation toxicity concerns at normal consumer-use levels — propane is not an asthmagen, sensitizer, or carcinogen. The danger is fire: aerosol cans pressurized with propane/butane should never be exposed to a heat source, open flame, or direct sunlight. Not on Prop 65. Disperses into the atmosphere after use; negligible environmental persistence.