IMDG Code, 2022 Edition Amendment 41-22


The International Maritime Dangerous Goods Code (IMDG Code) lays out the regulatory framework for all aspects of handling dangerous goods and marine pollutants in sea transport.

Amendment 41-22 includes revisions to various sections of the Code and to transport requirements for specific substances. It was adopted by the International Maritime Organization’s Maritime Safety Committee at its one hundred and fifth session in April 2022 and is mandatory from 1 January 2024 but may be applied on a voluntary basis from 1 January 2023. There is a general 12-month transitional period from 1st January 2023 to 31st December 2023 during which the previous amendment can continue to be used.

IMDG Code Free Summary of Changes 41-22 – Brief summary

As usual harmonized with the UN regulation, 22nd edition

  • Changes and new definitions in chapter 1.2. (New: IAEA, Inner vessel, pressure receptacle shell and service equipment).
  • Chapter 1.4 and 1.5, update to IAEA regulations.
  • Part 2 classification, new entry class 4.1 UN 3230, class 5.2 UN 3105, 3107 and 3117. Minor changes to chapter 2.6, 2.7, 2.8 and 2.9
  • Part 3: DGL – There is one new addition, UN 3550 COBALT DIHYDROXIDE POWDER, containing not less than 10% respirable particles, class 6.1.

Two existing numbers, UN 1169 EXTRACTS, AROMATIC, LIQUID and UN 1197 EXTRACTS, FLAVOURING, LIQUID are merged, becoming UN 1197 EXTRACTS, LIQUID, for flavour or aroma.

UN 1891 ETHYL BROMIDE changes class from class 6.1 to class 3, sub-hazard 6.1. The LQ, EQ and EmS values change as a result.

UN 3527 (PGII and PGIII), POLYESTER RESIN KIT, solid base material, changes ‘E0’ to now read ‘See SP340’

The distinction between strong and weak acids is deleted. All entries with SGG1a strong acid now have SGG1 acid. UN 1439 AMMONIUM DICHROMATE, the only entry with SG75 Stow “separated from” SGG1a – strong acids, now has SG35 and needs to be separated from all acids.

  • Chapter 3.3: Special provisions:There are new entries, SP396 for UN 3538, ARTICLES CONTAINING NON-FLAMMABLE, NON-TOXIC GAS, N.O.S., SP 397 for UN 1003, AIR, COMPRESSED and SP398 for UN 1012 BUTYLENE. There are minor wording changes to special provisions 188 and 225.
  • Chapter 4.1: Packing instructions – There are various notes added to several packing instructions to implement the new sentence added to which clarifies that when items other than UN packages are used, they are not subject to the usual 400 kg limit.

P200 has new provisions for mixtures of fluorine and inert gases. The LC50 values are updated in table 2 for UN 1008, 2196 and 2198, and for the latter two this increases the types of pressure receptacle that may be used.

P621 part (1) now allows non-removable head drums and boxes.

IBC07 has a new special packing ‘B40’ added providing use of flexible IBCs (13H3 and 13H4) for the new UN 3550

  • Part 5: Consignment– The requirement to show the telephone number on the lithium battery mark is now removed, with a transitional period until the end of 2026.
    • New requirement to inform about additional information, as instructed by the SP, in the transport document.
  • Part 6: Construction and testing of packagings– There are numerous changes in Part 6 concerning the design, construction, and testing of packaging’s, IBCs, tanks etc. and a brand-new chapter 6.10 covering the design construction, inspection, and testing of portable tanks with shells made of fibre-reinforced plastics (FRP) materials.
  • Chapter 7.2:– The entry for SGG1a is deleted as well as the entry for SG75.

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