The hazard class number for a flammable solid is:

The hazard class number for a flammable solid is:

• A. 4
• B. 3
• C. 6
• D. 2

Answer: (A)

Hazard class numbers identify the broad category of the dangerous material for transport. A flammable solid is placed in Class 4 because its defining hazard is that the solid can ignite readily. Therefore the class number assigned to a flammable solid is 4. Other numbers correspond to different hazard categories (for example, flammable liquids are Class 3, gases are Class 2, and toxic substances are Class 6). Within Class 4, there are divisions for specific conditions like spontaneous combustion and water-reactivity.

Hazard class numbers identify the broad category of the dangerous material for transport. A flammable solid is placed in Class 4 because its defining hazard is that the solid can ignite readily. Therefore the class number assigned to a flammable solid is 4. Other numbers correspond to different hazard categories (for example, flammable liquids are Class 3, gases are Class 2, and toxic substances are Class 6). Within Class 4, there are divisions for specific conditions like spontaneous combustion and water-reactivity.