Divisions are the subcategories of the nine hazardous
classes.
The Divisions are as follows:
1.1 Explosives with a mass explosion hazard
1.2 Explosives with a projective hazard
1.3 Explosives with predominately a fire hazard
1.4 Explosives with no significant blast hazard
1.5 Very insensitive explosives, blasting agents
2.1 Flammable gases
2.2 Nonflamable, nontoxic compressed gases
2.3 Gases toxic by inhalation
4.1 Flammable solids
4.2 Spontaneously combustible materials
4.3 Dangerous when wet materials
5.1 Oxidizers
5.2 Organic Peroxides
For more information, see http://hazmat.dot.gov