What materials does the UN/DOT Division 2.1 cover?

The UN/DOT Division 2.1 specifically addresses flammable gases. This classification is important because it includes gases that can catch fire easily and sustain combustion under ambient conditions. These gases often pose significant hazards during transportation and handling, which is why they are critically regulated. Flammable gases can include substances like propane, butane, and hydrogen, and their properties necessitate stringent safety measures to prevent explosions and fires.

Understanding this classification is vital for hazmat responders as it contributes to the assessment of risks and the implementation of safety protocols when dealing with incidents involving these materials. While flammable liquids, flammable solids, and toxic substances are important categories in their own right, they fall under different divisions established by the UN/DOT and do not share the specific criteria associated with Division 2.1.