UN number

from Wikipedia, the free encyclopedia
Hazard sign (orange warning sign):
above the hazard number  33
below the UN number 1203
(for petrol)

The UN number, also known as the substance number , is an identification number that is specified for all dangerous substances that are also classified as dangerous goods ( dangerous goods ). It is the lower number on the orange-colored warning signs ( danger signs ) attached to all dangerous goods transports and describes the composition (type) of the transported goods.

For a complete list of UN numbers see: List of UN numbers .

The upper number is called the danger number (Kemler number) .


The handling of dangerous goods was stipulated by the United Nations in the Model Regulations of the UN Recommendations on the Transport of Dangerous Goods , which are currently valid in Revision 19 (2015). This also includes building the database of dangerous goods according to the UN number.

It is used in international agreements such as the European Agreement on the International Carriage of Dangerous Goods by Road (ADR) and inland waterways (ADN, with ADNR and ADN-D), the Regulations for the International Carriage of Dangerous Goods by Rail (RID) and the international one Safety of Life at Sea (SOLAS) Convention .

Function of the UN number

The UN number describes the transported goods from which the hazard originates. It is not only awarded for individual chemical compounds , but also for groups of substances and other goods with a hazard potential. It is determined by an expert committee of the United Nations .

The substance number is always a four-digit number and is a sequential number in a list of all types of dangerous goods recorded. Most UN numbers have exactly one hazard number.

The UN number and the danger number should always be communicated to the police / fire brigade control center in the event of an accident, as this enables them to better coordinate the help. The numbers (together with the ERI cards ) provide fire brigades and other BOS with important information for the rapid identification of the hazard potential of substances and the initiation of correct measures.


Various institutions manage extensions to the UN number. They enable the labeling of hazardous substances for which no UN number exists. The IATA assigns ID numbers that have the same structure as the UN numbers. They use the prefix “ID” instead of “UN” and are limited to number ranges in the 8000 range, which are not used for UN numbers. It is similar with the by the United States Department of Transportation issued NA Number (for N orth A merica, North America) with the prefix "NA". With the NA numbers, there are also slight reinterpretations of UN numbers; so is NA2212 z. B. for all types of asbestos, but UN2212 only for certain types of asbestos.


See List of UN Numbers for full listing

See also


Web links

Commons : Danger sign (orange warning sign), sorted by UN number  - collection of images, videos and audio files

Individual evidence

  1. United Nations Economic Commission for Europe: Rev. 19 (2015) (en) , accessed March 16, 2019
  2. Information on chemical safety at the FU-Berlin from 1994, accessed July 4, 2017
  3. Environmental Resource Center (en) , What's the difference between a UN number and an ID number? , accessed Jul 4, 2017