Aerosols are any gas compressed, liquefied, or dissolved under pressure within a non-refillable container made of metal, glass, or plastic, with or without a liquid, paste, or powder. The container is fitted with a release device allowing the contents to be ejected as solid or liquid particles in suspension in a gas, as a foam, paste or powder, or in a liquid or gaseous state.
Aerosols should be considered for classification as either Category 1 or Category 2 Flammable Aerosol if they contain any component classified as flammable according to the GHS criteria for flammable liquids, flammable gases, or flammable solids.
Aerosols are considered:
Nonflammable: if the concentration of the flammable components < 1% and the heat of combustion is < 20 kJ/g. Extremely flammable: if the concentration of the flammable components > 85% and the heat of combustion is > 30 kJ/g to avoid excessive testing.
Flammable gas means a gas having a flammable range in air at 20 oC and a standard pressure of 101.3 kPa. Substances and mixtures of this hazard class are assigned to one of two hazard categories on the basis of the outcome of the test or calculation method (ISO 10156:1996).
Flammable liquid means a liquid having a flash point of not more than 93 oC. Substances and mixtures of this hazard class are assigned to one of four hazard categories on the basis of the flash point and boiling point. Flash point is determined by closed cup methods as provided in the GHS document, Chapter 2.5, paragraph 11.
Flammable solids are solids that are readily combustible or may cause or contribute to fire through friction. Readily combustible solids are powdered, granular, or pasty substances which are dangerous if they can be easily ignited by brief contact with an ignition source, such as a burning match, and if the flame spreads rapidly.
Substances and mixtures of this hazard class are assigned to one of two hazard categories.