At its June 2025 meeting, the ECHA Member State Committee (MSC) agreed to identify two new Substances of Very High Concern (SVHCs) for inclusion on the REACH Candidate List:
* Decamethyltetrasiloxane (L4) – EC 205-491-7
* 1,1,1,3,5,5,5-heptamethyl-3-[(trimethylsilyl)oxy]trisiloxane (M3T) – EC 241-867-7
An additional complex dye compound (EC 466-490-7) will be added to the Candidate List in June without MSC involvement.
The MSC also:
* Finalized two compliance check decisions,
* Reviewed and amended one testing proposal, and
* Continued work on its draft opinion regarding substances for inclusion on the REACH Authorisation List, to be adopted via written procedure after summer.
These developments signal ongoing regulatory scrutiny under REACH, impacting companies that manufacture, import, or use these substances within the EU/EEA. Affected stakeholders should monitor updates to the Candidate List and prepare for potential downstream obligations.

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European Chemicals Agency (ECHA), Substances of Very High Concern (SVHCs), Decamethyltetrasiloxane (L4), 1,1,1,3,5,5,5-heptamethyl-3-[(trimethylsilyl)oxy]trisiloxane (M3T)