What is the United Nations hazard class for a flammable solid?

Flammable solids are classified as Hazard Class 4 under the United Nations system. This classification is designed to address materials that are capable of igniting readily or are self-heating. These solids pose a significant fire risk if they come into contact with an ignition source and can produce hazardous conditions in a variety of environments.

In contrast, Hazard Class 1 includes explosives, which are substances that can produce an explosion under certain conditions. Hazard Class 2 pertains to gases, which include flammable, non-flammable, and toxic gases but does not specifically cover solids. Finally, Hazard Class 3 is reserved for flammable liquids, which are distinct from flammable solids in terms of their physical state and properties.

Understanding these classifications is crucial for responders to effectively manage incidents involving hazardous materials and ensures that the correct safety protocols are followed based on the specific hazards presented by the materials involved.