Which class of fire extinguishers is rated for use on combustible metals?

The class of fire extinguishers that is specifically rated for use on combustible metals is Class D. This classification is designed to address fires involving combustible metals such as magnesium, sodium, and potassium, which are not effectively extinguished by water or traditional extinguishing agents. Instead, Class D extinguishers typically contain dry powder agents that can smother the fire and absorb heat, effectively suppressing the flames without reacting dangerously with the burning metals.

Class A extinguishers are intended for ordinary combustibles like wood, paper, and cloth, while Class B extinguishers are for flammable liquids such as gasoline and oil. Class C extinguishers are suitable for electrical fires. Each of these classes contains agents that are not appropriate for handling fires involving combustible metals, which is why they do not qualify for use in those specific situations. Recognizing the proper type of extinguisher for different fire scenarios is crucial for effective fire safety and prevention.