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Hazard Classification System

The hazard class of dangerous goods is indicated either by its class (or division) number or name. Placards are used to identify the class or division of a material. The hazard class or division number must be displayed in the lower corner of a placard and is required for both primary and subsidiary hazard classes and divisions, if applicable. For other than Class 7 placards, text indicating a hazard (for example, "Corrosive") is not required. Text is shown only in the U.S. The hazard class or division number and subsidiary hazard classes or division numbers placed in parentheses (when applicable), must appear on the shipping document after each proper shipping name.

  • Explosives
    • Division 1.1
      Explosives which have a mass explosion hazard
    • Division 1.2
      Explosives which have a projection hazard but not a mass explosion hazard
    • Division 1.3
      Explosives which have a fire hazard and either a minor blast hazard or a minor projection hazard or both, but not a mass explosion hazard
    • Division 1.4
      Explosives which present no significant hazard
    • Division 1.5
      Very insensitive explosives with a mass explosion hazard
    • Division 1.6
      Extremely insensitive articles which do not have a mass explosion hazard
  • Gases
    • Division 2.1
      Flammable gases
    • Division 2.2
      Non-flammable, non-toxic* gases
    • Division 2.3
      Toxic* gases
  • Flammable liquids (and Combustible liquids [U.S.])
  • Flammable solids; Substances liable to spontaneous combustion; Substances which, on contact with water, emit flammable gases
    • Division 4.1
      Flammable solids, self-reactive substances and solid desensitized explosives
    • Division 4.2
      Substances liable to spontaneous combustion
    • Division 4.3
      Substances which in contact with water emit flammable gases
  • Oxidizing substances and Organic peroxides
    • Division 5.1
      Oxidizing substances
    • Division 5.2
      Organic peroxides
  • Toxic* substances and Infectious substances
    • Division 6.1
      Toxic* substances
    • Division 6.2
      Infectious substances
  • Radioactive materials
  • Corrosive substances
  • Miscellaneous dangerous goods/hazardous materials and articles
Date Modified: