Which extinguishers are suitable for Class D fires?

• A. Specialty dry powder (Class D) extinguishers
• B. Water-based extinguishers
• C. CO2 extinguishers
• D. Wet chemical extinguishers

Answer: (A)

Fires with metals require an extinguishing agent that is specifically formulated to handle the unique properties of burning metals. These fires react unpredictably with water and can be difficult to cool or smother with standard agents. A specialized dry powder designed for Class D metal fires is the best choice because it blankets the burning metal, absorbs heat, and forms a barrier that helps separate the metal from oxygen. This type of powder is tested for compatibility with various metals and is designed to minimize re-ignition risks. Water-based extinguishers can react violently with some metals, CO2 doesn’t effectively cool or blanket the metal, and wet chemical extinguishers are intended for cooking oils and fats, not metal fires. Using the right Class D dry powder extinguisher provides the most effective and safest control for metal fires.