Physical
Hazard Class 2 is for compressed gases and poisonous gases.
In the US Department of Transportation Hazard Classification, and in all other such regulations around the world, Hazard Class 6 is for Poisonous Material. Hazard Class 6 contains Divisions: 6.1 - poisonous materials 6.2 - infectious substances
Hazard Class 2 is for compressed gases. Class 2 has three divisions: Flammable (also called combustible), Non-Flammable/Non-Poisonous, and Poisonous.
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DOT Hazard Class 2 includes:Division 2.1 - Flammable gas Division 2.2 - Non-flammable gas Division 2.3 - Poison gas
It indicates a flammable or explosive gas.
The three main groups of compressed gases are Dissolved, Liquified and Non-Liquified gases. You can learn more about gases and compressed gases at the Wikipedia website.
Materials that have an explosive hazard are in Hazard Class 1.
All gases can be compressed.
compressed gases
Examples of Division 2.1 materials (flammable gases) include:acetylenediboraneRefrigerant Gas R32EthaneHydrogen, compressed