Hazard Classifications –¬†ADR Classes Explained

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 dependent on their predominant hazard as follows:

  • Class 1 – Explosive substances and articles
  • Class 2 – Gases
  • 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 substances
  • Class 8 – Corrosive substances
  • Class 9 – Miscellaneous dangerous substances and articles

Please also note that for packing purposes, certain substances are assigned a packing group.

 

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