governmentchemist


UK seeks restriction on D4 and D5 by Nick Boley
November 11, 2014, 11:29
Filed under: ECHA, Environment/Ecology | Tags: , ,

The UK Government has requested that two siloxanes commonly used in personal care product, namely octamethylcyclotetrasiloxane (D4) and decamethylcyclopentasiloxane (D5) be subject to restriction under REACH. A proposal will be submitted in January 2015, based upon the UK competent authority’s research which shows that these compounds are persistent and bioaccumulative in the environment.  It is particularly concerned about the release of these siloxanes into freshwater, leading to a build-up in sediments.

This will be a complex submission, and therefore the European Chemicals Agency, ECHA, has announced that this will be looked at, unusually, by both the Member States Committee (MSC) and the Risk Assessment Committee (RAC) in the first instance, due to its complexity. The background to this is shown here. Manufacturers and importers who have registered these substances with ECHA under REACH dispute that they are persistent and bioaccumulative.

These two substances can be measured in environmental materials – in the USA, the Environmental Protection Agency can determine D4 at levels of 0.037 µg/L by gas chromatography-mass spectrometry (GC-MS).

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