2.6 The Nine Hazard Classes and their Class Properties

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Dangerous goods have to be classified in accordance with the requirements in ADR and assigned a UN number, name, description and packing group (where appropriate) as indicated in the Dangerous Goods list in ADR. They are therefore assigned to different classes depending on their predominant hazard as follows:

1. Class 1: Explosives (Classes 1.1, 1.2, 1.3, 1.4, 1.5 and 1.6).
2. Class 2: Gases (Classes 2.1, 2.2, 2.3).
3. Class 3: Flammable Liquids.
4. Class 4: Flammable Solids (Classes 4.1, 4.2, 4.3).
5. Class 5: Oxidising Substances and Organic Peroxides.
6. Class 6: Toxic Substances and Infectious Substances.
7. Class 7: Radioactive Materials (3 gradings of intensity).
8. Class 8: Corrosive Materials.
9. Class 9: Miscellaneous Dangerous Substances and Articles.

Also, see the table below:

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