Flammable solids are categorized under which UN Hazard Class?

Flammable solids are categorized under UN Hazard Class 4. This classification includes materials that can ignite under normal conditions of handling and storage, presenting a risk of fire in various situations. Flammable solids can ignite through friction, sparks, or heat, and their combustion can lead to a fire hazard not only for the materials itself but also for surrounding materials.

Understanding this classification is crucial for emergency responders, as it informs the approach to handling and transporting such materials safely. Recognition of the UN Hazard Class helps in developing appropriate safety protocols and ensuring that proper precautions are taken to prevent incidents in the event of an accidental release or exposure. The other classes, such as Class 3 for flammable liquids or Class 5 for oxidizing agents, do not accurately describe the properties and risks associated with flammable solids.