Nine Classes of Hazardous Materials

Class 1: Explosives
Divisions: 1.1, 1.2, 1.3, 1.4, 1.5, 1.6
Class 2: Gases
Divisions: 2.1, 2.2, 2.3
Class 3: Flammable Liquid & Combustible Liquid
Class 4: Flammable Solid, Spontaneously Combustible, and Dangerous When Wet
Divisions: 4.1, 4.2, 4.3
Class 5: Oxidizer and Organic Peroxide
Divisions: 5.1, 5.2
Class 6: Poison (Toxic) and Poison Inhalation Hazard
Class 7: Radioactive
Class 8: Corrosive
Class 9: Miscellaneous
Dangerous