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DOT Hazard Classifications

U.S. Department of Transportation (DOT) Hazardous Materials Classifications

Within the United States and its territories, the U.S. Department of Transportation (DOT) regulates transportation of materials classified as hazardous, with regulations covering packaging, labeling marking and descriptions on shipping papers. Hazardous materials are classified by the numbering system listed below. The appropriate number appears in the listing for most hazardous materials in this section. Further restrictions apply to shipments by UPS, imports, exports, air and water carriers.

Class/Division DOT Hazard Description
1 Explosive
2.1 Flammable Gas
2.2 Non-flammable Gas
2.3 Poison Gas
3 Flammable Liquid
4.1 Flammable Solid
4.2 Spontaneously Combustible
4.3 Dangerous When Wet
5.1 Oxidizer
5.2 Organic Peroxide
6.1 Poison Keep Away from Food*
6.2 Infectious Substance
7 Radioactive
8 Corrosive
9 Miscellaneous

*For class 6.1 products that fall into the Package Group III category
For more information on DOT Hazmat, please refer to