- Fire caused by combustion of solid materials, mainly of organic origin, which normally burn under production of embers, e.g. wood, paper.
- Fires caused by combustion of liquids or materials that liquify e.g. petrol, benzene, tar, alcohol, oils, fats, stearin, paraffin.
- Fires caused by combustion of gases e,g. methane, propane, hydrogen, acetylene, natural gas, city gas.
- Fires caused by combustion of metals e.g. aluminium, magnesium, lithium, sodium, potassium and their alloys.
Extinguishers required to fight the different classifications of fire.