Fire Extinguisher Classes
The fire classification system is designed to categorise fires into groups based on the type of fuel involved. Each fire class is represented by a letter of the alphabet (with the exception of electrical which are simply referred to as “electrical fires”) and an icon. This helps users to select an appropriate fire extinguisher in the event of a fire.
Type of Fire / Fuel
Fires involving solid combustible materials such as wood, textiles, straw, paper, coal etc.
Fires caused by combustion of liquids or materials that liquify such as petrol, oils, fats, paints, tar, ether, alcohol, stearin and paraffin.
Fires caused by combustion of gases such as methane, propane, hydrogen, acetylene, natural gas and city gas
Fires involving combustible metals such as magnesium, aluminium, lithium, sodium, potassium and their alloys. Combustible metal fires are unique industrial hazards which require special fire extinguishers.
Combustible Cooking Media
Fires involving particularly hot or deep oil and grease fires, such as deep fat fryers in commercial kitchens or overheated oil pan fires in homes. Normal water-based extinguishers with large droplets would cause an �explosion� of steam and carry burning oils and fats from the container. Equally, a CO2 extinguisher�s jet would carry burning oil out of the container and also would have insufficient cooling effect to stop re-ignition. Wet chemical extinguishers, on the other hand, lay a cooling foam layer on top of the burning fat/oil and react with the liquid, stopping air supply to the fire.