There are five different classes to consider. The class of a fire extinguisher tells us the type of fire that it is designed to be used on. Fire extinguishers are classified as class A, B, C, D, and F.
Class A fire extinguishers are used to put out small fires on items such as paper, wood, cloth and other textiles.
Class B fire extinguishers are used for burning liquids such as petrol, cooking oil, kerosene and diesel fuel.
Class C extinguishers are for flammable gases such as Propane, Butane, Calor Gas and Methane.
Class D fire extinguishers are used to put out fires for combustible metals such as magnesium, potassium, powdered aluminium, sodium, sodium-potassium alloy uranium, and lithium.
Finally, extinguishers which are rated under class F are used to put out fires that have been caused from cooking oils and are most often found in restaurants and chip shops or anywhere that uses commercial deep fat fryers.