What class are flammable solids?

Flammable solids are classified as a type of hazardous material under the United Nations' classification system, specifically in the "Class 4" category. This class includes materials that can ignite easily and may pose a fire hazard during transport and storage. Examples of flammable solids include certain metals, powders, and organic materials like certain types of plastics and wood. Proper handling and storage protocols are essential to minimize fire risks associated with these substances.