The GB mandatory classification and labelling list (GB MCL List)

The GB MCL List gives information on the classification and hazard labelling of a substance and is legally binding in Great Britain (England, Scotland and Wales).

Published:

17 February 2025

Last updated:

22 September 2025

Documents

Details

If you’re classifying a:

• substance that appears in the GB MCL List, you must use the mandatory classification and labelling that appears in the list
• mixture that contains a substance on the GB MCL List, you must use the mandatory classification in your calculations - except where you have robust scientific data on the mixture itself which you can use to classify the mixture, rather than using information on the component substances

From 21 May 2026, the technical notes in points 1.1.3 to 1.1.3.2 of part 1 of Annex 6 of the GB CLP Regulation have been moved into the GB MCL list. This allows HSE to update these notes, as and when required.