European Agreement Concerning The International Carriage of Dangerous Goods By Road - Hazard Classes

Hazard Classes

The classes of dangerous goods according to ADR are the following:

  • Class 1 Explosive substances and articles
  • Class 2 Gases, including compressed, liquified and dissolved under pressure gases and vapors
    • Flammable gase (e.g. butane, propane acetylene)
    • Non-flammable and non-toxic, likely to cause asphyxiation (e.g. nitrogen, CO2) or oxidisers (e.g. oxygen)
    • Toxic (e.g. Chlorine, Phosgene)
  • Class 3 Flammable liquids
  • Class 4.1 Flammable solids, self-reactive substances and solid desensitized explosives
  • Class 4.2 Substances liable to spontaneous combustion
  • Class 4.3 Substances which, in contact with water, emit flammable gases
  • Class 5.1 Oxidizing substances
  • Class 5.2 Organic peroxides
  • Class 6.1 Toxic substances
  • Class 6.2 Infectious substances
  • Class 7 Radioactive material
  • Class 8 Corrosive substances
  • Class 9 Miscellaneous dangerous substances and articles

Each entry in the different classes has been assigned a 4 digit UN number. It is not usually possible to deduce the hazard class(es) of a substance from its UN number: they have to be looked up in a table. An exception to this are Class 1 substances whose UN number will always begin with a 0. See List of UN numbers

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