What is the common extinction agent for Class D fires involving metals?

The common extinguishing agent for Class D fires, which involve combustible metals such as magnesium, titanium, and sodium, is dry powder. This is specifically formulated for metal fires and is effective because it works through a combination of smothering action, heat absorption, and a chemical reaction that helps to prevent the fire from reigniting.

Using water, CO2, or other traditional extinguishers in Class D fires can lead to dangerous reactions, as many metals can react violently with water or create flammable gases when doused with CO2. Therefore, dry powder agents are designed to specifically address the unique challenges posed by metal fires, making them the appropriate choice for extinguishing such hazards.