Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Bioaccumulation: aquatic / sediment

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Administrative data

Link to relevant study record(s)

bioaccumulation in aquatic species: fish
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:

Description of key information

Low potential for bioaccumulation.

Key value for chemical safety assessment

Additional information

The parent substance as well as the hydrolysis products have a low potential for bioaccumulation (log Kow < 3).

No experimental studies are available investigating the bioaccumulation of dimethoxy(dimethyl)silane (CAS No. 1112-39-6). Dimethoxy(dimethyl)silane hydrolyses rapidly to dimethylsilanediol (DMSD) and methanol under environmental conditions (DT50 < 0.6 h at pH 7, pH 9 and 25 °C). Thus the bioaccumulation assessment is based on the hydrolysis products DMSD and methanol rather than the parent substance. Both hydrolysis products have low log Pow values indicating a low potential for bioaccumulation (DMSD: -0.38, methanol: -0.74, OECD SIDS, 2004). Thus, in accordance with Annex IX, 9.3.2., column 2 no study needs to be conducted since the log Pow is well below 3 and bioaccumulation is not expected.