Class A fires involve which type of material?

• A. Flammable Liquids (Halon)
• B. Flammable Gases (Halon)
• C. Solid Materials (Halon/Water glycol)
• D. Combustible Metals (Halon)

Answer: (C)

This question tests how fires are classified by the fuel state. Class A fires involve ordinary combustibles that are solid at room conditions and leave ash when they burn—things like wood, paper, cloth, and many plastics. Because the fuel is a solid, the primary way to extinguish is to remove heat, usually with water or water-based agents, cooling the material below its ignition temperature. That’s why solid materials is the correct description. Flammable liquids and gases burn as vapors, requiring extinguishing methods that control vapors or interrupt the flame chemistry, not just cooling of a solid. Combustible metals involve entirely different considerations and require specialized powders.