Flammable solids are classified as which DOT Class?

Flammable solids are classified as which DOT Class?

• A. DOT Class 1
• B. DOT Class 2
• C. DOT Class 3
• D. DOT Class 4

Answer: (D)

Flammable solids are placed in Class 4 of the DOT hazard classes. The numbered classes reflect the form and type of hazard: solids that burn readily are Class 4, while flammable liquids are Class 3 and gases are Class 2. So the ignition hazard comes from the solid material itself, not a liquid or gas, which is why a flammable solid falls under Class 4. Within Class 4, there are subcategories like 4.1 for flammable solids, 4.2 for spontaneously combustible, and 4.3 for water-reactive materials.

Flammable solids are placed in Class 4 of the DOT hazard classes. The numbered classes reflect the form and type of hazard: solids that burn readily are Class 4, while flammable liquids are Class 3 and gases are Class 2. So the ignition hazard comes from the solid material itself, not a liquid or gas, which is why a flammable solid falls under Class 4. Within Class 4, there are subcategories like 4.1 for flammable solids, 4.2 for spontaneously combustible, and 4.3 for water-reactive materials.