Which hazard class includes flammable solids?

Flammable solids are categorized under Class 4 of the hazard classification system. This class is specifically designated for materials that are readily ignitable under ambient conditions or when the materials are exposed to moisture. These materials can pose significant fire hazards as they can ignite easily and sustain combustion, making them a critical concern in transportation and storage.

The classification serves to ensure proper handling, storage, and transport protocols to mitigate the risks associated with these materials. Understanding this classification is essential for firefighters and safety personnel to tackle incidents effectively and ensure public safety.