Class D fires? Extinguishing agent?

Class D fires? Extinguishing agent?

• A. Water
• B. Foam
• C. Dry powder
• D. CO2

Answer: (C)

Class D fires involve combustible metals such as magnesium, titanium, aluminum, sodium, or potassium, and they need an extinguishing agent that won’t react with the metal while removing heat and isolating the fuel. Water-based agents can react violently with many reactive metals, foam isn’t effective at addressing metal combustion, and CO2 doesn’t reliably interrupt the chemical reaction at the metal surface. A dry powder designed specifically for metal fires coats the metal, absorbs heat, and forms a crust that isolates the fuel from oxygen and moisture, effectively stopping the reaction. This is why the best choice is a dry powder extinguishing agent.

Class D fires involve combustible metals such as magnesium, titanium, aluminum, sodium, or potassium, and they need an extinguishing agent that won’t react with the metal while removing heat and isolating the fuel. Water-based agents can react violently with many reactive metals, foam isn’t effective at addressing metal combustion, and CO2 doesn’t reliably interrupt the chemical reaction at the metal surface. A dry powder designed specifically for metal fires coats the metal, absorbs heat, and forms a crust that isolates the fuel from oxygen and moisture, effectively stopping the reaction. This is why the best choice is a dry powder extinguishing agent.