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UN Markings for
Hazardous Materials

The storage and transportation of hazardous materials (HAZMAT) is regulated by federal and international law. A standardized marking system has been developed for HAZMAT packaging that indicates what type and how much of a material may be contained within a package.

Reading a UN Marking

UN Symbol

UN/HAZMAT markings are a series of six codes that are separated by slashes. Each group of codes provide relevant identifying information about that specific package. A UN marking is required to appear on any package that has been UN certified and is to be used for the transportation of hazardous materials.

Example: UN 1A2 / Y2.0 / 100 / 12 / USA / M4460

This is a UN-certified, openhead, steel pail. It can safely contain mid-to-low level hazardous liquids with a specific gravity no greater than of 2.0 and endure pressure up to 100 kilopascals during transportation and storage. Finally, the US-made pail was built in 2012 by Cleveland Steel Container.

How did we know this?

Understanding a UN Marking

Following is a breakdown of the example UN marking, above. Each element of the code is detailed with the possible options that can be used to identify the different types of UN-certified packaging.

un markings

"UN" = United Nations Symbol, which can be displayed in one of two methods:

  • A lower-case “u” over a lower case “n” in a circle
  • Upper-case “UN”

Either signifies that a container is UN performance packaging.

UN 1A2 / Y2.0 / 100 / 12 / USA / M4460

"1" = Type of Container

1 = Drums/Pails 3 = Jerricans 5 = Bags 7 = Pressure Receptacles
2 = Wooden Barrels 4 = Boxes 6 = Composite Packagings

UN 1A2 / Y2.0 / 100 / 12 / USA / M4460

“A” = Material of Construction

A. Steel
B. Aluminum
C. Natural Wood
D. Plywood

F. Reconstituted Wood
G. Fiberboard
H. Plastic
L. Textile

M. Paper, Multi-wall
N. Metal (not Steel or Aluminum)
P. Glass, Porcelain or Stoneware

UN 1A2 / Y2.0 / 100 / 12 / USA / M4460

"2" = Packaging Head

1 =Tighthead/Closedhead (non-removable head) 2 = Openhead (head can be removed)

UN 1A2 / Y2.0 / 100 / 12 / USA / M4460

"Y" = Performance Level

X = High Hazard Level – Can be used for Groups I, II and III
Y = Medium Hazard Level – Can be used for Groups II and III
Z = Low Hazard Level – Can be used for Group III

UN 1A2 / Y2.0 / 100 / 12 / USA / M4460

"2.0" = Specific Gravity (maximum) for liquids or Gross Mass (maximum) in kilograms for solids

UN 1A2 / Y2.0 / 100 / 12 / USA / M4460

"100" = Hydrostatic Pressure (maximum) in kilopascals for liquids or “S” (without quotes) to indicate the packaged material is a solid

UN 1A2 / Y2.0 / 100 / 12 / USA / M4460

"12" = Year of Manufacture

UN 1A2 / Y2.0 / 100 / 12 / USA / M4460

"USA" = Country of Manufacture

UN 1A2 / Y2.0 / 100 / 12 / USA / M4460

"M4460" = Unique Code for:

Mxxxx = Packaging Manufacturer +AAxxxx = UN Certifying Agency

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Related Resources


UN/HAZMAT Markings Guide

Feel free to download our guide to reading UN Markings, which details everything from container type and performance level to the year and country of manufacture.

Download UN/HAZMAT Markings Guide

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