Cypermethrin banned in wood biocides: what manufacturers and distributors must do

Key data

Manufacturers and distributors of wood preservation biocides containing cypermethrin face a concrete problem: their products will lose marketing authorization in the European Union. The Commission Implementing Decision (EU) 2026/1112, published on May 26, 2026, establishes the non-renewal of approval of cypermethrin as an active substance in biocides of product type 8 (TP8), which are wood preservatives.

This is not a minor labeling change. It is the withdrawal of authorization for a key active substance for a product segment. Affected companies must act before the transition periods expire.

What does this regulation establish?

The Regulation (EU) No 528/2012 regulates the marketing and use of biocides in the European Union. Within this framework, active substances must be approved in order to be used in biocidal products. That approval has a limited validity period and must be renewed periodically.

In this case, the European Commission has decided not to renew the approval of cypermethrin for its specific use in product type 8 biocides. The direct consequence is as follows:

• Biocidal products containing cypermethrin for wood preservation will lose their marketing authorization in the EU.
• Companies manufacturing or distributing these products will have to reformulate their biocides by replacing cypermethrin with another authorized active substance, or withdraw them from the market.
• The exact periods for withdrawal will be those established by the applicable transition regulations.

Cypermethrin is a synthetic pyrethroid insecticide widely used in wood preservation treatments. Its exclusion from TP8 requires rethinking the formulation of a relevant part of the product catalog of companies in the sector.

Economic and operational impact

The impact is not limited to biocide manufacturers. The chain of effects reaches several links:

• Product reformulation: Developing and registering a new formulation without cypermethrin involves R&D costs, toxicological and ecotoxicological tests, and new authorization procedures with the competent authorities.
• Stock management: Products already manufactured and in storage will need to be managed within the transition periods. Stock that cannot be marketed will represent a direct loss.
• Review of safety data sheets and product records: All technical documents and product records linked to formulations with cypermethrin for TP8 will need to be updated or canceled.
• Supply chain: Construction and carpentry companies that use these treatments will need to identify alternative suppliers with authorized products.

The actual cost will depend on the volume of affected products in each company's catalog and the time available in the transition period. Companies that already have reformulation processes underway or registered alternatives will be in a better position.

Who does it affect?

• Biocide manufacturers that produce wood preservatives with cypermethrin as the active substance (TP8).
• Distributors and marketers of these products in the European market.
• Construction sector companies that use wood preservation treatments in their processes or projects.
• Carpentry and wood processing companies that apply or specify TP8 biocides in their products or facilities.
• Procurement and supply chain managers of any company that purchases these products for professional use.

Practical example

A wood preservative manufacturer has three biocidal products of type TP8 in its catalog, all formulated with cypermethrin as the main active substance. Following the publication of Commission Implementing Decision (EU) 2026/1112, these three products will lose their marketing authorization in the EU.

The company must make a decision for each product:

• Option A — Reformulation: Replace cypermethrin with another active substance approved for TP8, develop the necessary tests and request a new product authorization. This process can take months and requires investment in R&D and regulatory procedures.
• Option B — Withdrawal: Delist the product, manage existing stock within the transition periods and communicate the change to distributors and customers.

In parallel, its customers in the construction and carpentry sectors will need to identify alternative authorized products to replace those they will no longer be able to purchase.

What should companies do now?

1. Identify affected products: Review the complete catalog and locate all product type 8 (TP8) biocides containing cypermethrin as the active substance.
2. Review safety data sheets and product records: Update or cancel technical documents linked to affected formulations, in accordance with the transition periods established by the regulations.
3. Evaluate options: reformulation or withdrawal: For each affected product, decide whether to reformulate by replacing cypermethrin with an alternative authorized active substance, or withdraw it from the market.
4. Review the supply chain: If the company uses these biocides in its processes (construction, carpentry), identify alternative suppliers with authorized TP8 products.
5. Manage existing stock: Plan the marketing or disposal of current stock within the transition periods to avoid unnecessary losses.
6. Consult a biocide regulation specialist: The processes of reformulation and new authorization of biocidal products are complex. Having specialized advice on Regulation (EU) 528/2012 will reduce risks and timelines.