1. Water type, foam, ammonium phosphate dry powder, halogenated alkanes type extinguisher should be selected for class A fire, i.e., solid combustion. Class A fire: solid matter fire. The substance is often organic and usually produces glowing embers when burned. Such as wood, cotton, wool, hemp, paper fire, etc.
2. Saves a class B as liquid fire and melted solid material should be chosen type dry powder, foam, halogenated, carbon dioxide fire extinguisher (here it is important to note that chemical foam extinguisher fire cannot destroy the class B soluble solvent polarity, because chemical foam and organic solvent by touch, foam will quickly be absorbed, make bubble disappear very quickly, so you can't play the role of fire extinguishing. Alcohols, aldehydes, ketones, ethers, esters and other belong to a polar solvent). Class B fire: refers to liquid fire and melting solid matter fire. Such as gasoline, kerosene, crude oil, methanol, ethanol, asphalt, etc.
3. Dry powder, halogenated alkanes and carbon dioxide fire extinguishers should be used to fight and rescue class C fires, i.e. those with gas combustion. Class C fire: gas fire. Such as coal gas, gas, methane, ethane, etc.
4. Fire fighting type D, that is, metal burning fire, as far as China is concerned, there is no fixed fire extinguisher product. The main types of extinguishers in foreign countries are powdered graphite fire extinguishers and metal fire extinguishers. Dry sand or cast iron foam can be used to extinguish fire extinguishers and fire extinguishing agent beads in China. Class D fire: metal fire. Such as potassium, sodium, magnesium, titanium, aluminum magnesium alloys.
5. For class E fires, dry powder of phosphoric acid and halogenated alkanes should be used. Class E fire: fire of electrically charged objects. Such as the generator room, transformer room, distribution room, instrument room and electronic computer room, etc., when burning electrical equipment cannot be timely or not suitable for power cut.
6. Save class F fire, that is, cooking utensils (animal and vegetable oil) fire. Do not use water, foam and water - containing substances to extinguish fire.