Class 4 Division 2, more often called Division 4.2, is for spontaneously combustible materials
Class 4 division 3 (more properly called Division 4.3) is a Dangerous When Wet Material.
Class 4 Division 2, more often called Division 4.2, is for spontaneously combustible materials
The DOT classification for Spontaneously Combustible material is Division 4.2
Poisonous materials are found in DOT division 6.1.
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 4 is 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.
Poisonous gas is Division 2.3 in the DOT hazardous materials classification system.
DOT Class 3 is for flammable liquids, but there is no subdivision of the class so there is no division 3 for this class.
DOT class 6 division 1 materials consist of poisonous materials.
DOT division 4.1 is for flammable solids.
DOT Class 2, Division 1 (more properly called Division 2.1) is for flammable gases.