Hazardous Materials are classified as which class?

• A. Class D
• B. Class A
• C. Class B
• D. Class C

Answer: (A)

Hazardous materials response is organized into categories so responders know what kind of hazard they’re dealing with and how to fight or contain it. In this four-class system, the category that covers combustible metals—like magnesium, titanium, sodium, and lithium—is the metal fires class. These fires behave differently from ordinary combustibles or flammable liquids, and they don’t respond to water or common extinguishing agents the same way. They require specialized extinguishing media, such as dry powder, and specific handling to prevent a dangerous, escalating reaction. That’s why this classification is used to identify the appropriate tactics, making Class D the correct match for hazardous materials fires involving combustible metals. The other classes map to different hazards—ordinary combustibles, flammable liquids, and energized electrical—each needing different approaches.