Which extinguisher is used for combustible metals like magnesium?

• A. Class D extinguisher
• B. Wet chemical extinguisher
• C. Class K extinguisher
• D. Multipurpose extinguisher

Answer: (A)

Metal fires burn at extreme heat and can react violently with water or many common extinguishing agents, so they need a specialized approach. A Class D extinguisher uses a dry powder designed for combustible metals like magnesium. This powder blankets the metal, cools it, and separates the fuel from the oxygen, effectively smothering the fire and preventing reignition. Water-based or kitchen-type extinguishers and multipurpose ABC extinguishers aren’t appropriate for metal fires because they can be ineffective or dangerous, potentially causing explosions or intensified reactions. So, the best choice for magnesium and similar metals is the extinguisher formulated for metal fires.