Transporting Dangerous Goods: How to read a UN Number

TDG By Ground – UN Codes for Solids

1. Packaging codes
2. Packaging groups
   X = I, II, III
   Y = II, III
   Z = III
3. Maximum Gross Mass (KG)
4. Approval for solids or inner packaging
5. Year the container was manufactured
6. Country that authorized the packaging
7. The manufacturer identification code
8. The authorization number issued by the state the container was tested in.

TDG By Ground – UN Codes for Liquids

1. Packaging codes
2. Packaging Groups
   X = I, II, III
   Y = II, III
   Z = III
3. Maximum relative density
4. Hydraulic Test Pressure (kPa)
5. Year the container was manufactured
6. Country that authorized the packaging
7. The manufacturer identification code
8. The authorization number issued by the state the container was tested in.

For more information on TDG codes, how they are used, and where they should be located, take a look at the TDG by Ground Training Course Here

TDG By Air Training is available here.
TDG By Sea Training is available here.
For TDG By Ground in-class Training click here.