art_40__para_4
4. Products falling within the scope of a delegated act adopted pursuant to Article 4 shall not be placed on the market or put into service if they are designed to alter their behaviour or properties within a short period after being put into service, leading to a worsening of their performance in relation to any of the product parameters regulated in the applicable delegated acts adopted pursuant to Article 4, or their functional performance from the perspective of the user.
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Source: EUR-Lex (Cellar) · retrieved 2026-10-12 · Text as adopted (Official Journal); later amendments are not incorporated in this text.