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.
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