EU Approves 2-methyl-2,3-dihydro-1,2-thiazol-3-one hydrochloride as an Active Substance for Biocidal Products

Jul 08, 2025

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On July 2, 2025, the European Commission adopted (EU) 2025/1282, formally approving the chemical substance 2-methyl-2,3-dihydro-1,2-thiazol-3-one hydrochloride (CAS No.: 26172-54-3) as an active substance for biocidal products (Product Type 6), subject to the conditions specified in the annex.

Common Name

IUPAC Name

Identification Numbers

Minimum degree of purity of the active substance

Date of approval

Expiry date of approval

Product type

Specific conditions

2-methyl-2,3-dihydro-1,2-thiazol-3-one hydrochloride

IUPAC name: 2-methyl-2,3-dihydro-1,2-thiazol-3-one hydrochloride

EC No: 247-499-3

CAS No: 26172-54-3

> 990 g/kg

1 August 2025

31 July 2035

(1)

The authorisation of biocidal products containing 2-methyl-2,3-dihydro-1,2-thiazol-3-one hydrochloride as an active substance is subject to the following conditions:

(a)	the product assessment pays particular attention to the exposures, the risks and the efficacy linked to any uses covered by an application for authorisation, but not addressed in the Union level assessment of the active substance;

(b)	the product assessment pays particular attention to industrial and professional users;

(c)

Member States’ competent authorities or, in the case of a Union authorisation, the Commission, specify in the summary of the biocidal product characteristics of a biocidal product containing 2-methyl-2,3-dihydro-1,2-thiazol-3-one hydrochloride the relevant instructions for use and precautions to be indicated on the label of the treated articles under Article 58(3), second subparagraph, point (e), of Regulation (EU) No 528/2012.

(2)

The placing on the market of treated articles is subject to the following conditions:

(a)

the person responsible for the placing on the market of a treated article treated with or incorporating 2-methyl-2,3-dihydro-1,2-thiazol-3-one hydrochloride ensures that the label of that treated article provides the information listed in Article 58(3), second subparagraph, of Regulation (EU) No 528/2012;

(b)

mixtures other than paints treated with or incorporating 2-methyl-2,3-dihydro-1,2-thiazol-3-one hydrochloride and placed on the market for use by non-professional users do not contain 2-methyl-2,3-dihydro-1,2-thiazol-3-one hydrochloride at a concentration triggering classification of the mixture as skin sensitiser category 1 in accordance with Regulation (EC) No 1272/2008 of the European Parliament and of the Council (2), unless exposure can be avoided by other means than the wearing of personal protective equipment;

(c)

the person responsible for the placing on the market for use by non-professionals of a paint treated with or incorporating 2-methyl-2,3-dihydro-1,2-thiazol-3-one hydrochloride at a concentration triggering classification of the mixture as skin sensitiser category 1A, ensures that:

(i)	the paint is supplied with appropriate protective gloves in compliance with European Standard EN 374 or equivalent;

(ii)	the label indicates that protective gloves must be worn during use

This approval provides relevant companies with a clear compliance pathway, while also emphasizing the importance of consumer protection. Companies are required to strictly follow the labeling and protective measures requirements to ensure the safe circulation of products on the market.

Further Information

Official Journal

Related Inventories

EC Inventory: EINECS/ELINCS/NLP

EU REACH Substances of Very High Concern (SVHC) List

EU REACH Restriction List (Annex XVII)

EU List of Approved Biocidal Active Substances (BPR)

EU List of CMR Substances

EU Revises Persistent Organic Pollutants (POPs) Regulation to Strengthen Controls on Perfluorooctane Sulfonic Acid (PFOS)

ECHA Seeks Public Consultation on Occupational Exposure Limits (OELs) for Four Substances

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