Portable fire extinguishers space classified by the kind of fires they space designed come extinguish. There are five basic classifications that fuel and also extinguishers, and extinguishers space labeled with either letter-shaped or photographic symbols that suggest what varieties of fires they room intended for.

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Classifications of Fires and also Extinguishers

Class A

Class A fires involve simple combustible materials, such together cloth, wood, paper, rubber, and many plastics. Extinguishers through an A rating room designed come extinguish fires including these simple combustible materials.

Class B

Class B fires show off flammable and combustible liquids such together gasoline, alcohol, oil-based paints, lacquers. Therefore, extinguishers through a B rating room designed to extinguish fires involving flammable and combustible liquids.

Note: carry out not effort to extinguish a fire involving flammable gas unless there is reasonable assurance the resource of fuel deserve to be timeless shut off. In fact, if the just fuel burning is the leaking gas, the best technique for extinguishing the fire is come shut off the fuel supply. Extinguishing a flammable gas fire, without shutting turn off the fuel, will enable unburned gas to escape right into the atmosphere, which might permit a dangerous accumulation of gas to develop, and also an explosion may occur if the gas is exposed to an ignition source.

Class C

Class C fires indicate energized electrical equipment. Extinguishers with a C rating space designed because that use through fires entailing energized electrical equipment.

Class D

Class D fires involve flammability metals, such as magnesium, titanium, and also sodium. Extinguishers through a D rating room designed come extinguish fires including combustible metals.

Note: typical extinguishing agents might react through a combustible steel fire bring about the severity of the fire to increase. The many common an approach for extinguishing a combustible metal fire is to cover the burning material with a dry powder, such together sand, which will not react with the material. If you save or usage combustible metals, contact the Fire prevention Services office for a consultation concerning the proper form and quantity of extinguishing agent you should have available.

Class K

Class K fires involve vegetables oils, pet oils, or fat in food preparation appliances. Extinguishers through a K rating are designed to extinguish fires including vegetable oils, animal oils, or fats utilized in commercial cooking appliances.

Note: Extinguishers with a K rating room normally compelled where deep-fryers and/or griddles room utilized come prepare huge quantities of food. An instance would it is in a advertising kitchen similar to those discovered in restaurants and cafeterias.

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Multipurpose Extinguishers

Most portable extinguishers space rated for use with much more than one group of fire. Because that example, an extinguisher through a BC rating is an ideal for use with fires including flammable liquids and also energized electric equipment. One extinguisher through an alphabet rating is suitable for use v fires entailing ordinary combustibles, flammable liquids and energized electric equipment. One extinguisher the is rated because that use with multiple risks should incorporate a symbol for each hazard type.