The Great Britain Classification, Labelling and Packaging Regulation has produced three separate tranches of classification changes within 18 months, with the first hard compliance deadline — 15 August 2026 for 6th edition substances — now within weeks. For chemical product manufacturers, importers, and formulators, the immediate question is not whether their portfolio is affected. It almost certainly is.
The question is whether the label update process for affected substances and their downstream mixtures is underway, or whether it is still waiting on someone else’s desk.
GB CLP requires that a chemical label carries the correct GHS hazard pictogram, signal word, hazard statements (H statements), and precautionary statements (P statements) for each applicable hazard classification. When a substance’s classification changes, as it does when it appears on the 6th or 7th edition GB MCL List, or in the January 2026 WTO proposal, every one of those label elements that references the changed classification must be updated. This is not a cosmetic revision. It is a legal obligation with an enforcement deadline.
4 Steps to a Compliant Label Update
The first step is a substance inventory audit. Every substance in a product portfolio should be cross-referenced against the 6th edition GB MCL List (February 2025), the 7th edition (September 2025), and the January 2026 WTO notification to identify those with new or revised classifications. Where a substance appears on any of these instruments, its new classification must be identified and documented.
The second step is mixture reclassification. Where an affected substance is present in a formulated product above the relevant Specific Concentration Limit or Generic Concentration Limit, the mixture’s overall classification must be reassessed. A substance reclassified to Carcinogenicity 1B triggers H350 and “Danger” in the mixture if the concentration threshold is met, even if the mixture previously carried no carcinogenicity classification at all.
The third step is label artwork revision. Every element of the label that references the changed classification must be updated: the pictogram suite, the signal word, the H statements, and the P statements. Where the revised H and P statement set no longer fits the available label area at a legible size, booklet label formats should be evaluated before the deadline, not after it.
The fourth step is downstream communication. Updated Safety Data Sheets must be provided to all customers in the supply chain without undue delay. The SDS Section 2 must match the updated label exactly. Lead time for print procurement, artwork approval, and SDS distribution should be built into the compliance timeline. The August 2026 deadline does not accommodate last-minute surprises.