DOT Hazard Classification System

The hazard class of dangerous goods is indicated either by its hazard class (or division) number or name. For a placard corresponding to the primary hazard class of a material, the hazard class or division number must be displayed in the lower corner of the placard. However, no hazard class or division number may be displayed on a placard representing the subsidiary hazard of a material. For other than Class 7 or the OXYGEN placard, text indicating a hazard (for example, “CORROSIVE”) is not required. Text is shown only in the United States. The hazard class or division number must appear on the shipping document after each shipping name. The DOT hazard classes and divisions are as follows: