DOT Division 2.2 is for nonflammable compressed gases.
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.
The four classes of dangerous goods that have no divisions are Class 1 (Explosives), Class 2 (Gases), Class 6.2 (Infectious substances), and Class 7 (Radioactive materials). Each of these classes encompasses a range of hazardous materials that share similar characteristics but do not require further subdivision into divisions. This classification helps in the safe transportation and handling of these goods.