What is HAZMAT class 4 specifically used for?

Class 4 of the Hazardous Materials (HAZMAT) classification system specifically pertains to flammable solids. This classification includes materials that can easily ignite through friction, moisture retention, or spontaneous combustion. They pose significant fire hazards in a variety of settings, particularly when stored or transported improperly.

Understanding that Class 4 materials can catch fire and potentially spread flames to surrounding materials is crucial for firefighting and emergency response. It is essential for firefighters and HAZMAT operators to recognize and handle these materials appropriately to prevent fires and explosions during incidents involving flammable solids. Other classes, such as explosives or oxidizers, have different properties and hazards that do not align with the characteristics of Class 4 materials.