Which class includes explosives?

• A. Class 2: Gases
• B. Class 1: Explosives
• C. Class 3: Flammable liquids
• D. Class 4: Flammable solids

Answer: (B)

Explosives have their own hazard category because the primary risk is a sudden detonation or mass explosion, not just burning or pressure. In this system, all substances and articles designed to explode fall under Class 1: Explosives. That includes items like TNT, dynamite, blasting caps, and many fireworks. This category is distinct from the others: gases (which are about stored under pressure, with flammable or non-flammable varieties), flammable liquids (Class 3, liquids that ignite easily), and flammable solids (Class 4, solids that can ignite or cause friction fires). Recognizing that explosives belong to Class 1 helps determine the specific packaging, labeling, quantity limits, and handling rules needed for safe transport.