Which extinguisher class is used for fires involving combustible metals?

Which extinguisher class is used for fires involving combustible metals?

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

Answer: (D)

Fires involving combustible metals require a specialized approach because common extinguishing methods can be ineffective or dangerous. Metal fires burn at very high temperatures and some metals react violently with water or certain extinguishing agents. The appropriate suppressant is a dry powder designed specifically for metal fires, which works by isolating the metal and absorbing heat without reacting with it. This keeps the burn under control and prevents a hazardous runaway reaction. That’s why the correct class is Class D. For contrast, fires of ordinary combustibles use a Class A extinguisher, flammable liquids use Class B, and electrical equipment fires use Class C, none of which are suitable for metal fires.

Fires involving combustible metals require a specialized approach because common extinguishing methods can be ineffective or dangerous. Metal fires burn at very high temperatures and some metals react violently with water or certain extinguishing agents. The appropriate suppressant is a dry powder designed specifically for metal fires, which works by isolating the metal and absorbing heat without reacting with it. This keeps the burn under control and prevents a hazardous runaway reaction. That’s why the correct class is Class D.

For contrast, fires of ordinary combustibles use a Class A extinguisher, flammable liquids use Class B, and electrical equipment fires use Class C, none of which are suitable for metal fires.