DOT Division 2.2 is for nonflammable compressed gases.
What hazards are in DOT class 4
liquified gas
DOT Class 1 is for explosives and is divided into six divisions.
DOT Hazard Class 4 is for flammable solids such as magnesium metal.
Explosive materials are in DOT hazard class 1.
Class 1
DOT class 6 division 1 materials consist of poisonous materials.
Explosive materials
DOT Class 2, Division 1 (more properly called Division 2.1) is for flammable gases.
Flammable Solid
DOT division 4.1 is for flammable solids.
In the DOT system for classifying hazardous materials in transportation, Class 2, Division 1 (more properly called Division 2.1) is for flammable gases, usually compressed flammable gases.
Class 4 division 1 (more properly called Division 4.1) is for flammable solids.
division 4.1 is flammable solids