Description of DoD Hazard Classification System. The DoD hazard classification system consists of nine hazard classes plus a Not-Regulated category, thirteen compatibility groups, five sensitivity groups, and a parenthetical number.
3.5.1. Hazard Classes.
3.5.1.1. Class 1. AE is assigned to the class that represents an item’s predominant hazard characteristic. Class 1 applies to AE in which the explosive hazard predominates. The six Class 1 divisions used to indicate the character and predominance of explosive hazards. This Manual uses the term ―Hazard Division (HD)‖ to avoid repeatedly using the more cumbersome terminology ―Subdivision X of Division Y of Class Z.‖ The Class 1 divisions and subdivisions are described in Section 3D. See Chapter 2 for detailed reaction effects of Class 1 AE.