A projectile used in aerosols

1. Fluorochloroalkanes, commonly known as freon, are the most commonly used ejector for medicinal aerosol. F11, F12 and F1123 are commonly used.
2. Hydrocarbons, mainly propane, n-butane and isobutane, commonly used in local aerosols.
3. Hydrofluorochloroalkanes and hydrofluorohydrocarbons are commonly used in trifluorochloroethane, heptafluoropropane and chlorodifluoroethane.
The ejector is the power source of aerosol injection and can also be used as solvent or diluent of medicine. The ejector is mostly liquefied gas, the boiling point at atmospheric pressure is lower than room temperature, and the steam pressure is high. When the valve is open, the pressure is suddenly reduced, and the propellant vaporizes rapidly. The drug in the container is sprayed out in a mist by the pressure of the propellant.
The vapor pressure of the ideal projectile should be greater than atmospheric pressure at room temperature; Should be non-toxic, no sensitization and irritation; Should be colorless, odorless, tasteless; Should be stable, non-flammable and explosive, do not interact with drugs, containers; It should be cheap and easy to get.