In the UN/DOT labeling system, which hazard class contains flammable solids?

In the UN/DOT labeling system, which hazard class contains flammable solids?

• A. Corrosives
• B. Flammable solids
• C. Radioactive substances
• D. Gases

Answer: (B)

Hazard classes in UN/DOT are grouped by the type of hazard. The category that covers materials that ignite readily or burn is named Flammable solids, which is the official designation for Class 4. This is why the choice that names Flammable solids is the best answer—it directly matches the class responsible for flammable solids. The other options correspond to different classes (corrosives are Class 8, radioactive substances are Class 7, and gases are Class 2), so they do not describe flammable solids themselves. Flammable solids can include items like matches or sulfur, and some may release flammable gases when they contact water, illustrating why they belong to this specific class.

Hazard classes in UN/DOT are grouped by the type of hazard. The category that covers materials that ignite readily or burn is named Flammable solids, which is the official designation for Class 4. This is why the choice that names Flammable solids is the best answer—it directly matches the class responsible for flammable solids. The other options correspond to different classes (corrosives are Class 8, radioactive substances are Class 7, and gases are Class 2), so they do not describe flammable solids themselves. Flammable solids can include items like matches or sulfur, and some may release flammable gases when they contact water, illustrating why they belong to this specific class.