Regulation (EC) No 1907/2006 establishes requirements for the registration of substances manufactured or imported in the Union on their own, in mixtures or articles. The registrants have to provide the information required by Regulation (EC) No 1907/2006, as appropriate, in order to fulfil the registration requirements.

Article 13(2) of Regulation (EC) No 1907/2006 provides that test methods used to generate information on intrinsic properties of substances required by that Regulation are to be regularly reviewed and improved with a view to reducing testing on vertebrate animals and the number of animals involved. When appropriate validated test methods become available, the Commission Regulation (EC) No 440/2008 (2) and the Annexes to Regulation (EC) No 1907/2006 should be amended, if relevant, so as to replace, reduce or refine animal testing. The principles of replacement, reduction and refinement, enshrined in Directive 2010/63/EU of the European Parliament and of the Council (3) should be taken into account.

Pursuant to Regulation (EC) No 1907/2006, in vivo studies are required for the generation of information on skin sensitisation in point 8.3 of Annex VII to Regulation (EC) No 1907/2006.

In recent years, significant scientific progress has been made in the development of alternative test methods for skin sensitisation. Several in chemico/in vitro test methods have been validated by the European Union Reference Laboratory for Alternatives to Animal Testing (EURL ECVAM) and/or internationally agreed by the Organisation for Economic Cooperation and Development (OECD). These test methods may allow the generation of adequate information to assess whether a substance causes skin sensitisation without the need to resort to in vivo testing, when applied in an appropriate combination in the framework of an integrated approach to testing and assessment (IATA).

To reduce animal testing, point 8.3 of Annex VII to Regulation (EC) No 1907/2006 should be amended to allow the use of these alternative methods, where adequate information can be obtained through this approach and where the available test methods are applicable for the substance to be tested.

The currently available alternative test methods agreed by OECD are based on an adverse outcome pathway (AOP) describing the mechanistic knowledge about the development of skin sensitisation. These methods are not intended to be used on their own, but to be applied in combination. For the comprehensive assessment of skin sensitisation, typically methods addressing the first three key events of the AOP should be used.

However, under certain conditions, it may be possible to derive sufficient information without explicitly addressing all three key events by separate test methods. Therefore, the possibility should be given to registrants to scientifically justify the omission of tests addressing certain key events.

The test method indicated as the first choice for in vivo testing, the local lymph node assay (LLNA), provides information on the strength of the sensitisation potential of a substance. The identification of strong skin sensitisers is important to allow appropriate classification and risk assessment of such substances. It therefore should be clarified that the requirement for information allowing an assessment whether a substance should be presumed to be a strong sensitiser applies to all data, irrespective whether they are generated in vivo or in vitro.

However, in order to avoid animal testing and the repetition of already performed tests, existing in vivo skin sensitisation studies performed according to valid OECD test guidelines or EU test methods and in compliance to good laboratory practice (4) should be considered valid to fulfil the standard information requirement for skin sensitisation, even if the information derived from them is not sufficient for a conclusion whether a substance can be presumed to be a strong sensitiser.

In addition, the standard information requirements and adaptation rules in 8.3 of Annex VII should be revised in order to remove redundancies with rules set by Annex VI and Annex XI and in the introductory parts of Annex VII as regards the review of available data, the waiving of studies for a toxicological endpoint if the available information indicates that the substance meets the criteria for classification for that toxicological endpoint, or to clarify the intended meaning as regards the waiving of studies for substances that are flammable under certain conditions. Where reference is made to the classification of substances, adaptation rules should be updated to reflect the terminology used in Regulation (EC) No 1272/2008 of the European Parliament and of the Council (5).

ECHA, in cooperation with Member States and stakeholders, should further develop guidance documents for the application of the test methods and waiving possibilities for the standard information requirements provided by this Regulation for the purposes of Regulation (EC) No 1907/2006. In doing so, ECHA should take full account of the work carried out in OECD, as well as in other relevant scientific and expert groups.

Regulation (EC) No 1907/2006 should therefore be amended accordingly.

The measures provided for in this Regulation are in accordance with the opinion of the Committee established under Article 133 of Regulation (EC) No 1907/2006,