Flammable aerosols are those filled with flam mable contents, which may be liquids, solids or gases, including the contents and the propellant. In the DSD/DPD, flammable aerosols were classified as either extremely flammable, highly flammable or flammable. In CLP flammable aerosols are given their own hazard category and identified as extremely flammable aerosols or flammable aerosols.