Classes according to ADR
The ADR contains the following classes of dangerous goods:
- Class 1 Explosive substances and articles containing explosives
- Class 2 Gases
- Class 3 Flammable liquids
- Class 4.1 Flammable solids, self-reactive substances and desensitized explosive solids
- Class 4.2 Substances liable to spontaneous combustion
- Class 4.3 Substances which, in contact with water, emit flammable gases
- Class 5.1 Flammable (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
Each entry in the various classes is assigned a UN number. Certain substances may be assigned to packing groups for packing purposes on the basis of their degree of danger. These packing groups have the following meaning:
- Packing group I: Substances with high hazard
- Packing group II: Substances with medium hazard
- Packing group III: Substances with low hazard
The 3rd position of the packaging code number contains a letter indicating the substance groups for which the packaging type is approved:
- X for packaging for substances in packaging groups I to III;
- Y for packaging for substances in packaging groups II and III;
- Z for packaging for substances in packaging group III.
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