Class D fires involve which materials?

Class D fires involve which materials?

• A. Combustible metals
• B. Flammable liquids
• C. Electrical
• D. Flammable cooking media

Answer: (A)

Fire classifications separate fires by what is burning, and this item is testing that classification for metal fires. Class D fires involve combustible metals—things like magnesium, titanium, aluminum, and similar reactive metals. These metals burn at very high temperatures and can react dangerously with water, so they aren’t fought with ordinary water or standard extinguishers. The right approach uses specialized metal-fire extinguishing powders (dry powders designed for metal fires) or inert materials like sand to smother the fire and isolate the metal from air. Flammable liquids do not fit this class because they create Class B fires, which are addressed with foams, dry chemical powders, or other extinguishing methods rated for liquids. Electrical fires are mapped to a different category (often Class C, focusing on de-energizing the equipment and using nonconductive agents). Flammable cooking media, such as fats and oils in kitchens, fall under Class K (or F in some standards) and require wet chemical extinguishers designed for cooking fats/oils.

Fire classifications separate fires by what is burning, and this item is testing that classification for metal fires. Class D fires involve combustible metals—things like magnesium, titanium, aluminum, and similar reactive metals. These metals burn at very high temperatures and can react dangerously with water, so they aren’t fought with ordinary water or standard extinguishers. The right approach uses specialized metal-fire extinguishing powders (dry powders designed for metal fires) or inert materials like sand to smother the fire and isolate the metal from air.

Flammable liquids do not fit this class because they create Class B fires, which are addressed with foams, dry chemical powders, or other extinguishing methods rated for liquids. Electrical fires are mapped to a different category (often Class C, focusing on de-energizing the equipment and using nonconductive agents). Flammable cooking media, such as fats and oils in kitchens, fall under Class K (or F in some standards) and require wet chemical extinguishers designed for cooking fats/oils.