DOT Class 1 is for explosives and is divided into six divisions.
Explosive materials are in DOT hazard class 1.
DOT Hazard class 9 is Miscellaneous hazardous materials that do not meet the definitions of one of the other Hazard Classes. This class can include Environmentally Hazardous Substances, strong magnets shipped by air, and numerous other items.
DOT class 8 are corrosive.
3
DOT Hazard Class 3 is "Flammable Liquid".
DOT Hazard Class 4 is for flammable solids such as magnesium metal.
There are three (3) packaging groups in the DOT regulations for shipping hazardous materials. Note, however, that some hazard classes have no packaging groups.
Explosives, Hazard Class 1
Corrosive materials are in Hazard Class 8.
Division 1.3 is predominately a fire hazard, with a minor blast hazard.
There are nine (9) hazard classes in the hazard classification system used by the US Department of Transportation and other transportation agencies around the world. There may be a different number of classes in other processes.
Hazard class 4 is Flammable Solids.