What class of materials do flammable solids belong to?

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

Answer: (D)

Flammable solids belong to Class 4 of hazardous materials as defined by the Department of Transportation (DOT). This classification is specifically designated for materials that can easily ignite, and upon ignition, can sustain combustion. Examples include various types of metals, wood, and other organic solids that can pose a fire risk.

Class 4 is further divided into three divisions: Division 4.1 covers flammable solids, Division 4.2 pertains to substances that are liable to spontaneous combustion, and Division 4.3 applies to materials that emit flammable gases in contact with water. The significance of recognizing flammable solids as part of Class 4 ensures that proper safety measures and handling procedures are adhered to, minimizing the risk of fire incidents during transportation and storage.