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
Examples of Division 2.1 materials (flammable gases) include:acetylenediboraneRefrigerant Gas R32EthaneHydrogen, compressed
flammable solid
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
Class 4 Division 1 (more properly called Division 4.1) is for flammable solids.