Transport of Dangerous Goods by Road (ADR 2023)


6. Labeling (10/11)

Hazard numbers

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ADR 5.3.2
The Hazard Identification Number, which consists of two or three figures, gives an immediate information about the hazard nature of a dangerous goods from class 2 to 9.
  • First digit:
    indicates the main hazard associated to the dangerous goods.
  • Other Digits:
    indicate the additional or subsidiary hazards associated to the dangerous goods.
  • Details:
    Where the hazard associated with a substance can be adequately indicated by a single figure, this is followed by zero.
    80   Corrosive or slightly corrosive substance

    Doubling of a figure indicates an intensification of that particular hazard.
    88   Higly corrosive substance

    Prefix "X" indicates that that the substance will react dangerously with water.
    X80  Corrosive or slightly corrosive substance      that reacts dangerously with water
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Hazard label for acetone
Top: Hazard Identification Number
Bottom: UN number
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