UN publishes 24th Revised Edition of the UN Orange Book

Update: On 15 September 2025, the United Nations Economic Commission for Europe (UNECE) published the twenty-fourth revised edition of the UN Model Regulations (UN Orange Book Rev. 24) i.e. Model Regulations on the Transport of Dangerous Goods on the portal. The electronic version of UN Model Regulations Rev. 24 is available online for free consultation in two official UN languages (English and French). Both volume I and volume II of UN orange book are published on the portal.

Original Text:

On 16 July 2025, the United Nations Economic Commission for Europe (UNECE) announced amendments to the Model Regulations on the Transport of Dangerous Goods. These amendments to the twenty-third revised edition of the Model Regulations were approved by the UN Committee of Experts on the Transport of Dangerous Goods and on the GHS at its twelfth session on 6 December 2024, and will form the basis of the upcoming 24th revised edition.  

Earlier Update in August 2023  

Previously on 10 August 2023, the UNECE released the 23rd revised edition of the Model Regulations on the Transport of Dangerous Goods on its official portal. More details can be found here.   

Key Updates from the UN Orange Book 2025 

• Revised provisions for hybrid batteries containing both lithium-ion and sodium-ion cells, with new entries for batteries in equipment and cargo transport units. 
• Updated references to the latest ISO standards. 
• New allowance for the use of recycled plastic materials in flexible intermediate bulk containers (FIBCs). 
• Clarified packaging requirements for solids that may become liquid during transport. 
• Introduced provisions for the transport of liquid organic hydrogen carriers (LOHCs). 
• New rules for salvage pressure receptacles, based on maximum pressure-volume (pV) product. 
• Added provisions for the classification of energetic samples. 
• Exemptions for packaging small quantities of environmentally hazardous liquid substances. 
• Defined requirements for FRP service equipment used in portable tanks, covering design, construction, inspection, and testing. 

The electronic version of 24th revised edition of the Model Regulation will be available for free on the portal in September 2025.