Hazmat Division 4.1 poses what hazard?

• A. Oxidizing Agent
• B. Spontaneously Combustible
• C. Dangerous when Wet
• D. Flammable Solid

Answer: (D)

Division 4.1 is about flammable solids—materials that can ignite readily and burn, sometimes when exposed to heat, friction, or moisture. This is how hazmat classifications separate risks by type, so the division specifically identifies solids that pose a flammable fire hazard. The other descriptors point to different hazards: oxidizing agents belong to a separate category that can feed or accelerate flames, spontaneously combustible refers to materials that ignite on their own after a short exposure to air, and dangerous when wet describes solids that ignite or react vigorously when they come into contact with water. So the correct interpretation of Division 4.1 is the hazard of a flammable solid.