Fires involving combustible metals such as magnesium and sodium are classified as which class?

• A. Class A
• B. Class B
• C. Class C
• D. Class D

Answer: (D)

Fires involving combustible metals are classified as Class D. These metals—such as magnesium and sodium—burn at very high temperatures and can react violently with water or some common extinguishing agents, so they require special handling. The other classes cover different fuel types: Class A is ordinary combustibles like wood and paper, Class B covers flammable liquids, and Class C involves energized electrical equipment. Because metal fires need metal-specific extinguishing agents (typically a dry powder designed for metals) or smothering with inert material, the metal-fire classification is the only appropriate category. Water or standard extinguishing methods can make the fire worse or cause dangerous reactions.