Type 6 Biocides: The EU Bans This Formaldehyde Substance in 2026

Key data

Biocide manufacturers and industrial companies that rely on preservatives for product storage have a concrete problem as of 19 March 2026: the active substance they were using, or evaluating for use, no longer has a legal pathway in the European Union.

The Commission Implementing Decision (EU) 2026/599, adopted by the European Commission on 19 March 2026 and published in the Official Journal on 20 March, formally denies approval of formaldehyde released from reaction products of paraformaldehyde and 2-hydroxypropalamina (1:1 ratio) as an active substance for biocides of product type 6. This is not a temporary restriction or a pending review: it is a definitive non-approval under Regulation (EU) No 528/2012.

What does this regulation establish?

Regulation (EU) 528/2012 requires that any active substance used in biocides must pass a scientific evaluation process before it can be marketed in the EU. If the evaluation concludes that the substance does not meet the requirements, the Commission adopts a non-approval decision.

That is exactly what happens here. The substance evaluated is formaldehyde released from reaction products of paraformaldehyde and 2-hydroxypropalamina (1:1 ratio), and the denied use is its use as an active substance in biocides of product type 6: preservatives for products during storage.

Type 6 biocides are used to preserve non-living products (such as paints, adhesives, polymers, industrial fluids or other materials) during their storage, preventing deterioration caused by microorganisms.

The direct consequences of this decision are:

• No biocides containing this active substance can be authorized or marketed in the EU for use in product type 6.
• Existing biocide formulations that include this substance must be withdrawn or reformulated.
• Industrial and chemical supply chains that depend on these preservatives are directly impacted.

Economic and operational impact

The impact is not only regulatory: it has real operational and economic consequences for affected companies.

Product reformulation: Biocide manufacturers that included this substance in their formulations must initiate a reformulation process. This involves R&D costs, new efficacy and safety tests, and potential delays in the production chain.

Supplier review: Industrial companies that purchased preservatives based on this substance must identify and qualify new suppliers with approved active substances, which can affect delivery times and purchasing costs.

Marketing risk: Any company that continues to market biocides with this active substance in the EU incurs a violation of Regulation (EU) 528/2012, with the legal and sanctioning consequences that correspond according to the national legislation of each Member State.

Impact on supply chains: The decision affects not only direct biocide manufacturers, but also industrial sectors that use them as input, including manufacturers of paints, coatings, adhesives, polymers and process fluids.

Who does it affect?

• Biocide manufacturers that formulate or have formulated type 6 products with this active substance.
• Chemical industry companies that produce or distribute industrial preservatives based on formaldehyde released from paraformaldehyde and 2-hydroxypropalamina (1:1).
• Manufacturers of paints, adhesives, polymers and coatings that use type 6 biocides in their storage processes.
• Industrial fluid companies that require preservatives for the storage of their products.
• Procurement and supply chain managers in industrial sectors that depend on these preservatives as input.
• Distributors and marketers of biocides in the European market that have stock or contracts with this substance.

Practical example

A Spanish industrial paint manufacturer uses a type 6 preservative to preserve its products during warehouse storage. That preservative contains as its active substance formaldehyde released from the reaction of paraformaldehyde and 2-hydroxypropalamina (1:1).

As of 19 March 2026, the supplier of that preservative cannot continue to market it legally in the EU with that active substance. The paint manufacturer has two options: find an alternative preservative with an active substance approved under Regulation (EU) 528/2012, or assume the risk of continuing to use a product that no longer has regulatory coverage in the European market.

The first option involves reviewing the catalog of approved substances, contacting alternative suppliers, validating the efficacy of the new preservative in their formulations and updating the technical documentation of the product. A process that, depending on the size of the company and the complexity of the formulation, can take weeks or months.

What should companies do now?

1. Audit current formulations: Identify if any of the type 6 biocides that are used or marketed contain as active substance formaldehyde released from paraformaldehyde and 2-hydroxypropalamina (1:1). Review technical datasheets and supplier documentation.
2. Consult the list of approved substances: Access the ECHA biocidal active substances database to identify alternatives approved for product type 6.
3. Contact preservative suppliers: Request from usual suppliers alternatives with approved active substances and evaluate their availability and compatibility with your own formulations.
4. Initiate the reformulation process if applicable: If the company is a biocide manufacturer, start the reformulation process with the new active substance, including efficacy tests and updating technical and regulatory documentation.
5. Review contracts and stock: Verify if there are supply contracts or stock of biocides with this active substance that need to be renegotiated or managed before they generate a compliance problem.
6. Inform procurement and quality teams: Ensure that those responsible for procurement, quality and regulatory compliance are aware of this restriction to avoid purchases of non-compliant products.