This post was originally published in February 2013 and has been updated in September 2020 for accuracy.
Minimum Height of UN Numbers on Packages
Are my eyes getting better with age or did something change? Something changed.
Back in early 2014, a statement was added regarding the size of text on labels for dangerous goods. Both IATA (Air) and IMDG (Marine) have made changes to reflect the UN Model Regulation that became mandatory back on January 1st, 2014. Please reference the current “UN Model Regulations: 21st Edition; Section 5.2.1.1 (Vol 2).”, “IATA: 61st Edition; Section: 7.1.4.4 – Size (pg. 707)” and “IMDG Code: 2018 Edition; Section: 5.2.1.1 (Vol 1. pg. 268)” to find the following information.
The mandatory size for “UN number” and letters “UN” is below:
Some things to note:
- The way this is written is such that the UN number and letters “UN” MUST be at least the size specified above whereas other package markings SHOULD be that minimum size.
- Other package markings include the proper shipping name, technical name, the word “Overpack”, and any other markings.
See the example below:
For more information regarding Packaging, check out our UN Performance Packaging FAQ.
We have all the products, services and training you need to ensure your staff is properly trained and informed.
 4GV UN Boxes – Variation |
 TDG Non-Worded Hazard Class Labels |
 Cargo Aircraft Only, 4.5″ x 5″, Gloss Paper, 500/Roll |
ICC USA
ICC Canada
the us dot regulations have always required the size of lettering to be size appropriate to the size of the packaging – as someone who has been doing this for over 30 years – we need the bigger lettering so we can read the packages without our glasses – more important though it increases the safety and handling of packages
Larry Snellings
Dangerousgoods.com
Houston Texas