Hazardous Material Class

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Hazardous Material Class

The U.S. DOT divides regulated hazardous materials into nine classes, some of which are further subdivided. Hazardous materials in transportation must be placarded and have specified packaging and labeling. Some materials must always be placarded, others may only require placarding in certain circumstances.

Value	Description
1	Explosives
1.1	Explosives with a mass explosion hazard
1.2	Explosives with a projection hazard
1.3	Explosives with predominantly a fire hazard
1.4	Explosives with no significant blast hazard
1.5	Very insensitive explosives with a mass explosion hazard
1.6	Extremely insensitive articles
2	Gases
2.1	Flammable gases
2.2	Non-flammable, non-toxic gases
2.3	Toxic gases
3	Flammable liquids (and Combustible liquids [U.S.])
4	Flammable solids; Spontaneously combustible materials; and Dangerous when wet materials / Water-reactive substances
4.1	Flammable solids
4.2	Spontaneously combustible materials
4.3	Water-reactive substances/Dangerous when wet materials
5	Oxidizing substances and Organic peroxides
5.1	Oxidizing substances
5.2	Organic peroxides
6	Toxic substances and Infectious substances
6.1	Toxic substances
6.2	Infectious substances
7	Radioactive materials
8	Corrosive substances
9	Miscellaneous hazardous materials/Products, Substances or Organisms

The codes originate in the United Nations Globally Harmonized System of Classification and Labelling of Chemicals and have been included in U.S. federal regulation Title 49 CFR 173. The Federal Motor Carrier Safety Administration (FMCSA) State Safety Data Quality (SSDQ) Program created the following guidance for law enforcement officers to identify Hazardous Materials. (Aka. Yellow Visor Card).

Hazardous Material Classification

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