ARTICLE · 16 SEPTEMBER 2026
New CLP Hazard Classes: The Final Transition Deadline For Existing Substances Is Approaching
The European Union's new hazard classes for chemical substances are nearing the end of their transitional period, with a critical deadline of 1 November 2026 for substances already in the market. These classifications cover endocrine disruption, persistent and bioaccumulative properties, and mobile toxic characteristics that will fundamentally change how companies must classify, label, and register chemical substances under REACH and CLP regulations.
The European Unions (EU) new hazard classes are approaching the end of their transitional period for substances placed on the EU market and in the supply chain before 1 May 2025. Introduced by the EU Commission Delegated Regulation (EU) 2023/707, the new hazard classes cover the following properties:
- Endocrine disruption (ED) for human health and the environment;
- Persistent, bioaccumulative, and toxic (PBT);
- Very persistent, very bioaccumulative (vPvB);
- Persistent, mobile, and toxic (PMT); and
- Very persistent, very mobile (vPvM).
For substances already placed on the EU market and in the supply chain before 1 May 2025, the final transition deadline is 1 November 2026. From that date, the new classification requirements will apply, and substances must be classified and labelled in accordance with the new hazard classes. Substances first placed on the market from 1 May 2025 have been subject to the new rules from that date.
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