The CLP new hazard classes are no longer optional for existing substances. As of 1 November 2026, every substance already on the EU market before 1 May 2025 must be classified and labelled under four new hazard classes covering endocrine disruption, persistence, bioaccumulation, and mobility. For chemical manufacturers, formulators, and any producer whose bill of materials contains affected substances, the deadline is not a single filing. It sets off a cascade that moves from one reclassified substance to the mixtures that contain it, the safety data sheets that describe it, the labels that ship with it, and the REACH dossiers that register it.

This guide explains what changed, who is in scope, and why the real workload is a portfolio-wide substance survey rather than a one-time label swap. If you need to understand your own exposure first, you can book a compliance risk assessment to map which substances and mixtures are affected across your product lines.

Key Takeaways

📌 The CLP new hazard classes became mandatory for existing substances on 1 November 2026 under Delegated Regulation (EU) 2023/707.

⚠️ A single reclassified substance can trigger changes to multiple mixtures, SDSs, labels, and REACH dossiers.

📊 Four new classes apply: endocrine disruption (human health and environment), PBT/vPvB, and PMT/vPvM.

⏳ Existing mixtures follow on 1 May 2028; new mixtures have been in scope since 1 May 2026.

🏭 Chemical, coatings, electronics, automotive, and battery manufacturers are all exposed through their bill of materials.

📄 Classification relies on self-assessment using weight of evidence, so documenting the basis is critical for audit readiness.

What the CLP New Hazard Classes Actually Are

Commission Delegated Regulation (EU) 2023/707 amended Annex I of the CLP Regulation (EC) No 1272/2008 and added four hazard classes for endocrine disruptors to human health and the environment, and for PBT/vPvB and PMT/vPvM properties. The regulation has been in force since 20 April 2023. These were the first new hazard classes added to CLP in many years, and they capture risks that the older GHS-based categories did not fully address.

The four classes break down as follows.

One point many teams miss: these classes carry no new pictogram. The hazard is communicated through new EUH hazard statements and signal words, not a GHS symbol. That makes them easy to overlook in a quick label review and easy to miss in automated label checks that only look for pictogram changes.

Classification is also largely a self-assessment duty. The regulation requires classification into these categories to be based on an assessment of the total weight of evidence using expert judgment. There is no single harmonised list that resolves every substance for you, which is why horizon scanning and substance-level intelligence matter here more than usual.

The November 1, 2026 Deadline in Context

The transition was deliberately staggered between substances and mixtures, and the two timelines are out of sync. That mismatch is the source of most of the confusion.

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, after which substances must be classified and labelled in accordance with the new hazard classes. That date has now arrived. For existing mixtures, the clock runs until 1 May 2028, which is covered in more depth in our companion analysis on the CLP new hazard classes for mixtures.

A separate 2024 CLP revision, Regulation (EU) 2024/2865, carries its own timetable and does not change the 2023/707 deadlines above. Teams tracking multiple CLP amendments at once need regulatory intelligence and horizon scanning that keeps these separate workstreams from blurring together.

The Cascade Nobody Prices In

Most coverage of this deadline stops at "reclassify your substances." The harder reality is what happens downstream when a substance picks up a new classification. Each reclassified substance can set off a chain reaction across the product portfolio.

1. Reclassified substance. A substance is assessed and now meets the criteria for, say, ED HH Category 1 or PBT.

2. Affected mixtures. Every mixture containing that substance at or above the generic concentration limit may need to be reclassified. For Category 1 endocrine disruptors the limit is 0.1% in the mixture, and for Category 2 it is 1%. PBT, vPvB, PMT, and vPvM generally trigger mixture classification at 0.1%.

3. SDS regeneration. The safety data sheet for each affected substance and mixture must reflect the new classification in Section 2 and the related sections. For a Category 2 endocrine disruptor present at or above 0.1%, an SDS must be made available on request even where one was not previously required.

4. Label changes. New EUH hazard statements and signal words must appear on the label, with no new pictogram to flag the change visually.

5. REACH dossier update. The classification recorded in the REACH registration dossier should align with the new CLP classification and document the basis of the assessment.

The operational problem is multiplication. One substance used across forty formulations becomes forty SDS reviews, forty label checks, and a dossier reconciliation. This is where BOM-level compliance intelligence earns its place: it lets you move from "this substance changed" to "these are the exact products, SDSs, and declarations affected" without a manual trace through spreadsheets.

The New Labels and SDS Elements in Detail

The label and SDS impact is concrete. Each new class maps to a specific hazard statement code. The new EU hazard statements are EUH380 and EUH381 for endocrine disruption in humans, EUH430 and EUH431 for endocrine disruption in the environment, EUH440 and EUH441 for PBT and vPvB, and EUH450 and EUH451 for PMT and vPvM.

Managing this at scale means reading, parsing, and reconciling thousands of supplier SDSs and certificates. AI document parsing and certificate validation can extract classification data from inconsistent supplier documents and flag where a supplier SDS has not yet been updated to the new classes, which is a common gap in the first months after a deadline.

The REACH Dossier Connection

CLP classification and REACH registration are linked, and this deadline exposes any drift between them. ECHA has made the new hazard classes available in IUCLID for inclusion in REACH registration dossiers since spring 2024, and registrants should review existing dossiers for alignment between the CLP classification, the safety data sheet, and the REACH registration dossier.

In practice, three records have to agree: the self-classification under CLP, the SDS that communicates it, and the dossier that registers it. When a substance moves into a new class, all three need to be reconciled and the weight-of-evidence basis documented. Teams already managing REACH obligations alongside SVHC and Annex XVII changes will recognise this as the same evidence-integrity problem in a new form. Our guidance on REACH SVHC and Annex XVII changes covers the adjacent obligations that frequently move at the same time.

Who Is Affected and Where the Exposure Sits

The scope is broad because the affected substances are common industrial building blocks. Many plasticisers, solvents, and additives fall within the new criteria, and PMT/vPvM overlaps significantly with PFAS and other persistent, mobile chemicals.

• Chemical manufacturers and formulators. Direct classification duty on substances, plus the mixture cascade. See the chemical and hazmat compliance view.

• Coatings, adhesives, and specialty chemicals. Heavy use of additives and solvents now in scope.

• Electronics manufacturers. Substances embedded across components reach the BOM through suppliers, as discussed in PFAS in electronics manufacturing.

• Automotive and battery producers. Materials and process chemicals carry persistence and mobility concerns.

For any manufacturer that places substances or mixtures on the EU market, the trigger is not your industry label. It is whether an affected substance sits anywhere in your materials and environmental compliance footprint. The only reliable way to know is a substance-level survey of the portfolio.

The Real Workload: A Portfolio-Wide Substance Survey

The deliverable that actually protects you is not a label template. It is an inventory that answers four questions for every substance you place on the market or buy in:

1. Does this substance now meet the criteria for any of the four new classes?

2. Which of our mixtures contain it at or above the relevant concentration limit?

3. Which SDSs and labels are affected, and have suppliers updated theirs?

4. Does the REACH dossier record the new classification and its basis?

Running this manually across a large portfolio is where programs stall. Automated supplier data collection through structured portals reduces the back-and-forth of chasing updated declarations, and a centralized compliance data backbone keeps substance, mixture, SDS, label, and dossier records connected so a change in one place surfaces every downstream record it touches.

Struggling to map affected substances across your portfolio?

Certivo connects substance-level data to your bill of materials so a single reclassification shows you every affected product, SDS, and declaration. Book a compliance risk assessment to see where your CLP exposure actually sits.

Compliance Risk and Enforcement Exposure

Enforcement of CLP sits with national market-surveillance authorities across EU member states, and the obligations apply to manufacturers, importers, downstream users, and distributors. The practical risks after 1 November 2026 are:

⚠️ Non-compliant labels and SDSs for substances still carrying pre-2023/707 classifications.

⚠️ Misaligned REACH dossiers that do not reflect the current CLP classification.

⚠️ Customer and OEM findings, since downstream buyers increasingly request current SDSs and declarations as a condition of supply.

Classification is a self-assessment duty based on expert judgment, so the ability to show how a classification decision was reached matters as much as the decision itself. Audit-ready documentation with time-stamped records of the assessment basis is the difference between a defensible position and a scramble during a customer audit or market-surveillance query.

How to Approach This Now

A pragmatic sequence for teams that are either mid-transition or verifying completion:

1. Inventory substances across your portfolio and supplier base.

2. Assess each substance against the four new classes using weight of evidence, and document the basis.

3. Map affected mixtures using concentration limits (0.1% for Category 1 ED, PBT, vPvB, PMT, vPvM; 1% for Category 2 ED).

4. Regenerate SDSs and labels with the correct EUH statements and signal words.

5. Reconcile REACH dossiers in IUCLID with the new classifications.

6. Prepare for 1 May 2028 by applying the same survey to existing mixtures now, while the data is fresh.

How Certivo Supports CLP Reclassification at Scale

Certivo is an AI-native platform that acts as the system of record for product compliance. For the CLP new hazard classes specifically, the value is in managing the cascade rather than any single step. CORA-powered regulatory intelligence tracks CLP amendments and related REACH developments so the right substances surface before a deadline, not after. BOM-level material mapping ties each substance to the exact products, mixtures, and declarations it appears in, turning one reclassification into a precise, bounded work list.

On the data side, CORA-enabled document parsing reads supplier SDSs and certificates, extracts classification data, and flags documents that have not been updated to the new classes. Combined with continuous monitoring, this shifts a team from reactive, deadline-driven scrambles toward continuous compliance readiness across chemical and hazmat obligations and the wider regulatory frameworks a global manufacturer carries.

Conclusion

The CLP new hazard classes are now mandatory for existing substances, and the substantive work is not the classification itself but the cascade it triggers across mixtures, SDSs, labels, and REACH dossiers. Manufacturers that treat 1 November 2026 as a single label task will find gaps surfacing in customer audits and surveillance checks over the coming year. Those that run a portfolio-wide substance survey, document the basis of each classification, and connect substance data to their bill of materials will be ready for the 1 May 2028 mixtures deadline on the same foundation.

To understand your exposure and reconcile substance, SDS, label, and dossier records in one place, book a compliance risk assessment with Certivo.