(106)In the absence of harmonised standards, recourse to common specifications should be used as a fall-back solution to facilitate the manufacturer’s obligation to comply with sustainability requirements, for instance where there are undue delays in establishing a harmonised standard. In addition, recourse to common specifications should be possible where the Commission has restricted or withdrawn the references to relevant harmonised standards in accordance with Article 11(5) of Regulation (EU) No 1025/2012. Compliance with common specifications adopted by the Commission by means implementing acts should also give rise to a presumption of conformity.