The CLP trap for mixture manufacturers in 2026: substance vs. mixture deadlines and action points

MSDS-Europe – Compass to chemical safety – The CLP trap for mixture manufacturers in 2026

With the introduction of the new CLP hazard classes, substances and mixtures were given different application deadlines. This creates a typical “information gap” in 2026: the mixture manufacturer (formulator) must already classify according to the new logic, while the supplier may still legitimately remain in a transitional period.

The solution is not “more legislation”, but a supplier data programme, documented decisions, and strict version control.

 

What changed that creates a “trap situation”?

The EU introduced the new hazard classes by amending the CLP Regulation. The aim is, among other things, more consistent identification of endocrine disruptors and chemicals that persist and/or spread in the environment.

From a company perspective, however, the primary risk is not the terminology, but the difference in deadlines.

 

Key dates

According to the Hungarian authorities’ summary, application of the new hazard classes is:

  • mandatory for substances: 1 May 2025
  • mandatory for mixtures: 1 May 2026
  • for products already placed on the market, the end of the transitional period: substances 1 November 2026, mixtures 1 May 2028

 

The “trap window”: 1 May 2026 – 1 November 2026

During these 6 months, the mixture manufacturer may already be obliged to classify based on the new hazard classes, while the supplier of the substance may still be in a transitional period (and therefore often updates the SDS or classification information later). The logic of the deadlines is lawful in itself – the risk arises in practice.

 

In brief: which new hazard classes may affect your portfolio?

In this article we do not set out the criteria in detail (this can be covered in a separate material on your site). Here, it is sufficient to note that the EU added the following new areas to CLP hazard classification:

  • endocrine disruptor (human health and the environment),
  • PBT / vPvB (persistent, bioaccumulative and toxic / very persistent, very bioaccumulative),
  • PMT / vPvM (persistent, mobile and toxic / very persistent, very mobile).

Note for communication: BAuA (German competent authority) provides a 2025 summary that illustrates well how these new classes appear in practice (especially for mixtures).

 

Why is supplier information typically delayed?

The mixture manufacturer is often also a downstream user: formulating from supplied substances and/or “mixtures in mixture” type inputs.

The trap tends to repeat for several reasons:

  1. Legitimate transitional period → weak incentive for rapid updates
    If the supplier can still place the product on the market under the transitional rules, there is not always a business incentive to accelerate SDS updates.
  2. Limited transparency
    The formulator cannot see all data behind each constituent, yet must still classify the final product correctly.
  3. Divergent supplier positions
    Two suppliers may reach different conclusions for the same substance until market practice “settles”.

 

The CLP trap for mixture manufacturers: 4 typical scenarios

 

1) “Old SDS, new obligation”

After 1 May 2026, the mixture may already be subject to the new logic. However, the supplier’s SDS may still not reflect the status under the new hazard classes.
Risk: the mixture’s classification and the safety data sheet / label are not consistent.

 

2) “One supplier says yes, the other says no”

Two raw materials contain the same substance (same CAS number), but one supplier already indicates the new status while the other does not.
Risk: the mixture’s classification depends on which supplier you purchased from.

 

3) “Mixtures in mixture” – missing details

A pre-blended additive (e.g., a stabilizer package or preservative mixture) is only partially transparent.
Risk: the information required to classify the final product is not available in time.

 

4) “We can run out the stock, so we can wait” – false sense of security

For mixtures, the sell-through deadline may extend to 2028, but from 2026 the compliance pressure can still appear in production and sales (new label, new SDS, customer expectations).

 

What should the mixture manufacturer do? Practical solutions, not legalistic wording

 

1) Don’t do “all products at once”: portfolio prioritisation

Prepare a short list:

  • Top 20 SKUs by volume/revenue,
  • products marketed in multiple countries,
  • formulations where the new hazard classes are likely to be relevant.

Goal: a realistic transition sequence.

 

2) Supplier data programme (minimum data package)

Managing the 2026 trap cannot be done with email ping-pong. It is worth using a standardised data request.

Minimum to request:

  • updated SDS (and the expected update date),
  • statement whether the substance is affected by any of the new hazard classes,
  • if yes, which one (ED HH/ED ENV / PBT/vPvB / PMT/vPvM),
  • change notification process (who is notified, within what timeframe).

Tip: make “change notification” measurable in supplier contracts (deadline, responsible person, channel).

 

3) “Decision record” for classification (audit-ready)

If you must decide based on incomplete data in summer 2026, the best protection is a documented decision.

Create a one-page template:

  • what input data were available,
  • what was missing,
  • what risk management approach supported the decision,
  • when the decision must be reviewed.

This is a conservative, professional solution. It also helps in dispute situations.

 

4) Version control: formulation ↔ SDS ↔ label (as one chain)

The trap is often not a toxicology issue, but an administrative breakdown:

  • the formulation version does not match the SDS version,
  • an outdated statement remains on the label,
  • the SDS sent to the customer does not correspond to the batch actually supplied.

Minimum objective: every issued SDS and label must be clearly linked to a formulation version.

 

5) Stock run-out “on paper” and in reality

Treat run-out planning as a separate project:

  • printed label stock,
  • multilingual label variants,
  • warehouse stock and production scheduling,
  • customer specifications (B2B customer requirements often apply earlier).

 

6) If relevant: “notification to poison centres” (PCN) and a UFI control point

It is not central for every company, but where hazardous mixtures are placed on the market, include a PCN/UFI check in change control.

 

2028 may be the year of “double workload”

The end of the transitional period for mixtures is 1 May 2028.

In parallel, the EU postponed the application of several requirements of the 2024 CLP revision to 1 January 2028 (“stop-the-clock”), which may bring additional tasks in label format, advertising and distance selling (online).

Message: By 2028, two separate compliance waves can easily converge. Companies that put data and process discipline in place in 2026 can transition in 2028 more cost-effectively and with lower risk.

 

FAQ

Why is summer 2026 the highest-risk period?

Because from 1 May 2026, mixtures may already be required to follow the new classification logic, while the transitional period for substances may last until 1 November 2026. This creates an information gap.

What can I do if the supplier has not yet provided updated information?

Launch a supplier data programme (minimum data package + change notification) and introduce an internal decision record for classification. Do not decide “from memory”.

Is it enough to run out the old label until 2028?

Sell-through may be lawful, but it can be risky from a business and operational perspective. Customers and audits often expect updates earlier, and from 2026 the new logic may already apply to mixtures.

Do the new hazard classes require new pictograms?

No hazard pictogram is assigned specifically to these new hazard classes; hazard communication is typically provided via supplemental hazard statements (EUH statements) and—depending on the overall classification—via a signal word.

When do I need a “classification decision record”?

It is particularly useful when you must decide based on incomplete or conflicting supplier data (typically between May–Nov 2026), or when different suppliers provide differing positions.

Why should we start already in 2025 if the mixture deadline is 2026?

Because implementing processes (data requests, version control, label transition, stock run-out) takes time. The trap usually hits not on the deadline date, but in the months that follow.

 

Conclusion – the trap is avoidable, but only with process discipline

The CLP risk for mixture manufacturers in 2026 does not increase because “CLP has become more complicated”. It increases because the different deadlines for substances and mixtures create an information and responsibility gap.

 

The best protection in 5 points:

  1. portfolio prioritisation,
  2. supplier data programme,
  3. documented classification decisions,
  4. formulation–SDS–label version control,
  5. stock and transition plan.

 

Do you have further questions?

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