Copper(II) oxide biocide extension: what changes for the timber sector

Key data

Manufacturers and distributors of biocides containing copper(II) oxide can continue marketing their products without interruption. Implementing Decision (EU) 2026/619, adopted on 19 March 2026, postpones the expiry date of the approval of this active substance for biocidal products of product type 8, intended for wood preservation.

The decision does not impose any operational changes or new obligations. Its effect is exclusively preventive: to avoid the approval expiring before the ongoing scientific evaluation has been completed.

What does this regulation establish?

Regulation (EU) 528/2012 on biocidal products establishes that active substances must be approved before they can be used in biocidal products. These approvals have expiry dates and must be renewed through periodic scientific evaluation.

When that evaluation is ongoing and has not been completed before the scheduled expiry date, the same regulation allows the Commission to postpone that date. That is precisely what Decision 2026/619 does with copper(II) oxide.

In practical terms, the legal framework applicable to these products does not change. The conditions of use, labelling and marketing in force prior to the decision remain valid.

Economic and operational impact

The direct impact of this decision is positive for the affected companies: it eliminates the risk of business interruption that would have resulted from the expiry of the approval without renewal.

Without the extension, biocidal products containing copper(II) oxide would have lost their legal basis for marketing at the scheduled expiry date. This would have forced manufacturers and distributors to withdraw products from the market, reformulate or halt sales, with the consequent impact on revenues, contracts and the supply chain.

With the extension in force:

• There is no need to withdraw products from the market.
• No reformulation of existing products is required.
• There are no changes to labelling processes or product registrations.
• Companies in the construction and timber structure maintenance sectors maintain continuous access to these biocides.
• No additional compliance costs arise from this decision.

The only remaining element of uncertainty is the date on which the full scientific evaluation of copper(II) oxide will be completed, which will determine whether the approval is renewed, modified or withdrawn. That date is not specified in the current decision.

Who is affected?

This decision directly affects the following business and professional profiles:

• Biocide manufacturers that include copper(II) oxide as an active substance in type 8 products.
• Distributors and marketers of biocidal products for wood preservation in the European market.
• Construction sector companies that use biocidal treatments to protect timber structures.
• Wood treatment companies (sawmills, industrial joinery, treated timber manufacturers).
• Timber structure maintenance companies (roofing, facades, street furniture, infrastructure).
• Purchasing and procurement managers in sectors that depend on the supply of biocide-treated timber.
• Regulatory and compliance advisors who manage the registration and marketing of biocidal products.

Practical example

A manufacturer of treated timber for outdoor use (decking, fencing, garden structures) uses in its production process a product type 8 biocide containing copper(II) oxide as the active substance.

Without Decision 2026/619, the approval of that substance would have expired on the scheduled date. The manufacturer would have faced a situation in which its biocidal product would lose its legal basis for marketing in the EU, forcing it to seek an alternative formulation, halt sales or assume the regulatory risk of continuing to operate without a valid approval.

With the extension in force from 19 March 2026, that same manufacturer can continue producing and selling its treated timber without any changes to its processes, registrations or labelling. Its supply chain is not disrupted and its customers in the construction and maintenance sector continue to receive the product normally.

The only necessary follow-up is to monitor when the full scientific evaluation of copper(II) oxide is completed, as the outcome of that evaluation will determine the definitive long-term regulatory framework.

What should companies do now?

1. Review the inventory of affected products: Identify which biocidal products in your portfolio contain copper(II) oxide as an active substance in the product type 8 category (wood preservation).
2. Confirm operational continuity: Communicate to production, sales and procurement teams that there are no changes to the legal framework and that marketing can continue normally.
3. Update regulatory monitoring: Add the status of the scientific evaluation of copper(II) oxide to your regulatory alert calendar, as its conclusion will determine the next relevant regulatory change for these products.
4. Review long-term supply contracts: If you have contracts that include regulatory compliance clauses or approved active substance availability clauses, confirm that the extension covers the contractual period and that no review clauses are triggered.
5. Consult the regulatory affairs manager: If your company manages biocide registration with the competent authorities, confirm with the regulatory affairs manager that the extension is correctly reflected in the product documentation and national authorisation files.

Official source

Disclaimer: This article is for informational purposes only and does not constitute legal advice. For specific decisions, please consult a qualified professional. Source: https://eur-lex.europa.eu/./legal-content/AUTO/?uri=OJ:L_202600619