Which hazard class is identified by a flame over circle symbol on the DOT placard?

Which hazard class is identified by a flame over circle symbol on the DOT placard?

• A. Class 2 Gases
• B. Class 3 Flammable Liquids
• C. Class 6 Poisons
• D. Class 8 Corrosives

Answer: (B)

The symbol described—a flame over a circle—alerts you to a flammable liquid hazard. In DOT labeling, this kind of pictogram is used to identify Class 3 materials, which are liquids that can ignite and burn readily. Knowing this helps you plan rapid, appropriate actions: keep ignition sources away, ventilate to manage vapors, and use suitable extinguishing methods like foam or a broad water spray to cool containers and prevent reignition.

This symbol doesn’t match the other classes. Gases are shown with cylinder imagery, poisons with a skull-and-crossbones motif, and corrosives with a symbol depicting skin or metal damage. So the flame over circle emphasizes flammable liquids, guiding responders to treat the material as a Class 3 fire risk.