Class 5 materials like ammonium nitrate fertilizers are categorized into which group?

Class 5 materials, including ammonium nitrate fertilizers, are categorized as oxidizers. Oxidizers are substances that can cause or enhance the combustion of other materials by providing oxygen or oxygen-containing substances. Ammonium nitrate is a prime example of an oxidizing agent; it can readily release oxygen when subjected to heat, pressure, or contamination, which can lead to hazardous situations, especially when in contact with flammable materials.

Understanding this classification is crucial for hazard communication and safety practices, particularly in emergency response situations. Oxidizers can significantly increase the risk of fire or explosion, making it essential for hazmat technicians to recognize and handle such materials appropriately.