What are the categories and USES of common fire extinguishers

Foam extinguisher: suitable for general fire fighting, such as oil products, grease and other fire can not be saved with water. Can not put out the fire of water soluble flammable liquid fire, such as alcohol, ester, ether, ketone and other material fire; It should not be used to extinguish fires on live equipment.2Dry powder extinguisher: can put out the general fire, but also put out the oil, gas and other combustion caused by the fire. Mainly used to put out the initial fire of oil, organic solvent and other flammable liquid, combustible gas and electrical equipment.3Carbon dioxide fire extinguisher: used to extinguish books, archives, expensive equipment, precision instruments, electrical equipment under 600 volts and oil fire hazard. It is suitable to put out the fire of general oil products and grease. It can not put out the fire of water-soluble flammable liquid, such as alcohol, ester, ether, ketone and so on.