The UN/DOT hazard class for a flammable liquid is:

The UN/DOT hazard class for a flammable liquid is:

• A. 1
• B. 3
• C. 5
• D. 4

Answer: (B)

Flammable liquids are classified as Class 3 in the UN/DOT system because the main hazard they present is flammability in liquid form. The classification uses flash point to determine the class: liquids with a flash point at or below 60°C are placed in Class 3. Other hazard classes correspond to different risks—explosives are Class 1, flammable solids are Class 4, and oxidizing substances (including some organic peroxides) are Class 5. Since a liquid that can ignite falls under the flammable liquids category, the appropriate UN/DOT hazard class is Class 3.

Flammable liquids are classified as Class 3 in the UN/DOT system because the main hazard they present is flammability in liquid form. The classification uses flash point to determine the class: liquids with a flash point at or below 60°C are placed in Class 3. Other hazard classes correspond to different risks—explosives are Class 1, flammable solids are Class 4, and oxidizing substances (including some organic peroxides) are Class 5. Since a liquid that can ignite falls under the flammable liquids category, the appropriate UN/DOT hazard class is Class 3.