What is the DOT hazard class for flammable solids, spontaneously combustible, and dangerous when wet?

The DOT hazard class for flammable solids, spontaneously combustible materials, and substances that are dangerous when wet is classified as Class 4. These materials present specific hazards, as they can ignite easily under certain conditions, which makes them particularly dangerous in firefighting and emergency response scenarios.

Class 4 is divided into three divisions: Division 4.1 includes flammable solids; Division 4.2 covers spontaneously combustible materials, which can ignite without an external ignition source; and Division 4.3 pertains to materials that can react with water to release flammable gases. Understanding this classification is crucial for emergency responders, as it helps in determining the appropriate safety measures and procedures when dealing with these hazardous materials.