A flammable gas is in Division 2.1 in the widely used classification of hazardous materials recommended by the UN Committee of Experts and adopted by the US Department of Transportation, among other nations.
Division 2.1 is for flammable gasses.
"Non-flammable compressed gas" is the formal terminology. This class/division includes carbon dioxide (co2) cylinders, air tanks, and many industrial gasses described as "inert". Flammable gasses/aerosols, and toxic gasses/aerosols are also in class 2, but different divisions (2.1, and 2.3 respectively)
DOT Hazard Class 2 includes:Division 2.1 - Flammable gas Division 2.2 - Non-flammable gas Division 2.3 - Poison gas
Class 2 division 1, more properly called division 2.1, is for flammable gasses.
A flammable solid would fall into Division 4.1
flammable solid
Examples of Division 2.1 materials (flammable gases) include:acetylenediboraneRefrigerant Gas R32EthaneHydrogen, compressed
Class 1 Division 1 location is designated as an area where flammable volatile liquids or liquefied flammable gases are transferred from one container to another. An example of this would be at a gas station when you put gasoline into your vehicle.The area around the pumps is class 1 div. 1.
A hazardous material that is a flammable solid is classified in Division 4.1
Flammable Solid
flammable solid
Division 4.1 is for flammable solids.