HSE Updates the GB Mandatory Classification and Labelling List

On 15 February 2025, the UK Health and Safety Executive (HSE) published the 6th edition of the Great Britain (GB) Mandatory Classification and Labelling (MCL) list. This update includes new and revised classifications for 46 substances, following the fourth GB CLP Agency recommendation approved by Ministers in January 2025.

Background on the GB MCL

The GB MCL list is a legally binding list managed by the HSE, serving as a cornerstone for the classification and labelling of substances and mixtures in Great Britain (England, Scotland, and Wales). It ensures that manufacturers, importers, downstream users, and distributors adhere to consistent standards, protecting public health and the environment. The list is regularly updated to reflect new scientific data, regulatory decisions, and to align with international standards. These updates may include the addition of new substances, revisions to existing classifications, and editorial changes for clarity. Stakeholders are encouraged to stay informed about these changes to maintain compliance and safety protocols.

Key Highlights of the 6th Edition:

• New Substance Classifications: The update includes substances such as nonylphenol ethoxylates, hydrogen sulfide, diuron, and 1-phenylethylidene hydrazone. These substances have an entry into force date of 15 February 2025, with a compliance deadline of 15 August 2026. The full list, along with specific classifications and hazard information can be downloaded from the HSE website.

• Corrections and Clarifications: This update also includes a number of editorial corrections, correcting previously reported errors such as typographical mistakes. Full details of the Agency’s recommendations and updated classifications can be found in the HSE GB CLP Publication Table.

Stakeholders are encouraged to review the updated GB MCL list to ensure compliance with the new classifications by the specified deadlines.