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Identification of Dangerous Goods
PSN and UN Number
Within each of the 9 hazard classes dangerous goods are uniquely identified by two pieces of information:
A four-digit number known as the UN Number which is
preceded by the letters UN.
The corresponding Proper Shipping Name (PSN).
For example, kerosene is identified in the IMDG Code by its UN Number UN 1223 and the PSN Kerosene.
IMDG Code reference: 2.0.2