Statement | D4, D5 and D6 Siloxanes

Since June 27th European Chemicals Agency (ECHA) included following siloxanes on their EU REACH Candidate List for Substances of Very High Concern (SVHC)


  • D4 (Octamethylcyclotetrasiloxane)
  • D5 (Decamethylcyclopentasiloxane) and
  • D6 (Dodecamethylcyclohexasiloxane)


SVHC is a term used in Europe under the EU REACH regulations to list substances that meet certain criteria. In case of D4, D5 and D6 EU has decided to include these substances due to existing or predicted environmental properties (PBT and/or vPvB properties).


  • PBT is the criteria for persistent, accumulative and toxic at the same time
  • vPvB means very persistent and very accumulative at the same time


Regarding D4 the above mentioned criteria have been met by analytical results, for D5 and D6 the European authorities assumed and predicted the same, since both are similar to D4 in chemistry and structure. ...



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Sector German title English title Type Date Language
CorporateKundeninformation | D4, D5 und D6 SiloxaneCustomer Information | D4, D5 and D6 siloxanesDocument20.07.2018