Siloxanes Group

Information sheet

These substances were identified for action under the Chemicals Management Plan (CMP). This screening assessment focuses on 6 of 7 substances referred to collectively as the Siloxanes Group.

Summary of publications
Substance group CAS RN Common name DSL name Draft screening assessment Proposed conclusion on section 64 criteria Follow-up activities
Siloxanes Group 107-46-0 Hexamethyldisiloxane (L2) Disiloxane, hexamethyl- HTML Does not meet None planned at this time
141-62-8 Decamethyltetrasiloxane (L4) Tetrasiloxane, decamethyl-
141-63-9 Dodecamethylpentasiloxane (L5) Pentasiloxane, dodecamethyl-
541-05-9 Cyclotrisiloxane (D3) Cyclotrisiloxane, hexamethyl-
2627-95-4 Divinyltetramethyldisiloxane (dvTMDS) Disiloxane, 1,3-diethenyl-1,1,3,3-tetramethyl-
69430-24-6Table 1 Footnote a Cyclomethicone Cyclosiloxanes, di-Me
Table 1 Footnote a

This substance is a UVCB (unknown or variable composition, complex reaction products, or biological materials).

Table 1 Return to footnote a referrer

Date Activity
June 2020 Anticipated publication of the final screening assessment.
June 1, 2019 Publication and start of 60-day public comment period on the draft screening assessment.  The related notice was published in the Canada Gazette, Part I: Vol. 153, No. 22.


A seventh substance, CAS RN 33204-76-1, was initially identified as being part of the Siloxanes Group at the outset of the third phase of the CMP. This substance was subsequently determined to be of low concern to both human health and the environment through other approaches. Conclusions for this substance are provided in the Screening Assessment for the Rapid Screening of Substances with Limited General Population Exposure.

Report a problem or mistake on this page
Please select all that apply:

Thank you for your help!

You will not receive a reply. For enquiries, contact us.

Date modified: