Fires in paper, cloth, wood, rubber, and many plastics require a water type extinguisher labeled A.
Fires in oils, gasoline, some paints, lacquers, grease, solvents, and other flammable liquids require an extinguisher labeled B.
Fires in wiring, fuse boxes, energized electrical equipment, computers, and other electrical sources require an extinguisher labeled C.
Ordinary Combustibles, Flammable Liquids, or Electrical Equipment
Multi-purpose dry chemical is suitable for use on class A, B, and C.
Combustible metals such as magnesium and sodium require special extinguishers labeled D.