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
Read more about this topic: European Agreement Concerning The International Carriage Of Dangerous Goods By Road
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