Which DOT hazard class corresponds to flammable liquids?

Which DOT hazard class corresponds to flammable liquids?

• A. Class 3: Flammable liquids
• B. Class 4: Flammable solids
• C. Class 6: Poison or toxic
• D. Class 7: Radioactive

Answer: (A)

Understanding how the DOT classifies hazmat by primary hazard helps explain this: flammable liquids are grouped in the class that specifically covers fire hazards from liquids. This category is the one designated for flammable liquids, because the main danger is ignition from vapors and low flash points. That’s why gasoline and many common solvents fall under this class. The other options refer to different hazards—flammable solids are a separate class, poisons or toxic materials another, and radioactive materials yet another—so they don’t describe liquids that ignite easily. So the hazard class for flammable liquids is the class that focuses on flammability of liquids.

Understanding how the DOT classifies hazmat by primary hazard helps explain this: flammable liquids are grouped in the class that specifically covers fire hazards from liquids. This category is the one designated for flammable liquids, because the main danger is ignition from vapors and low flash points. That’s why gasoline and many common solvents fall under this class. The other options refer to different hazards—flammable solids are a separate class, poisons or toxic materials another, and radioactive materials yet another—so they don’t describe liquids that ignite easily. So the hazard class for flammable liquids is the class that focuses on flammability of liquids.