UN number
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A UN number (
Hazard identifiers
Associated with each UN number is a hazard identifier, which encodes the general hazard class and subdivision (and, in the case of explosives, their compatibility group). If a substance poses several dangers, then subsidiary risk identifiers may be specified. It is not possible to deduce the hazard class(es) of a substance from its UN number: they have to be looked up in a table.
Range
UN numbers range from UN 0004 to about UN 3550 (UN 0001 – UN 0003 are no longer in use) and are assigned by the United Nations Committee of Experts on the Transport of Dangerous Goods. They are published as part of their
Non-UN identifiers
An NA number (
An ID number is a third type of identification number used for hazardous substances being offered for
See also
- Globally Harmonized System of Classification and Labelling of Chemicals
- Lists of UN numbers
- Dangerous goods
- CAS registry number
- List of NA numbers
References
- ^ "Title 49 - Part 173 - Subtitle B - Chapter I - Subchapter C - Part 172 - Subpart B". eCFR - Code of Federal Regulations. U.S. Government Publishing Office. Retrieved 2023-11-13.
External links
- United Nations Committee of Experts on the Transport of Dangerous Goods
- UN Recommendations on the Transport of Dangerous Goods. Part 2 defines the hazard classes and their divisions and Part 3 contains a complete list of all UN numbers and their hazard identifiers.
- The Emergency Response Guidebook from the U.S. Department of Transportation contains a list of all assigned NA numbers along with recommended emergency procedures.
