Using the UN/DOT labeling system, a flammable liquid would receive a hazard classification of:

Using the UN/DOT labeling system, a flammable liquid would receive a hazard classification of:

• A. 1
• B. 2
• C. 6
• D. 3

Answer: (D)

The key idea is that the UN/DOT labeling system communicates the main danger of a material through its hazard class. For flammable liquids, the primary risk is ignition, so they’re placed in the class that represents ignition hazards from liquids. This class is marked with the flame symbol on labels, signaling fire risk, and it is distinct from other classes that cover explosives, gases, or toxic substances. So the material is categorized in the fire-risk liquid class, rather than the other hazard classes.

The key idea is that the UN/DOT labeling system communicates the main danger of a material through its hazard class. For flammable liquids, the primary risk is ignition, so they’re placed in the class that represents ignition hazards from liquids. This class is marked with the flame symbol on labels, signaling fire risk, and it is distinct from other classes that cover explosives, gases, or toxic substances. So the material is categorized in the fire-risk liquid class, rather than the other hazard classes.