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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Endpoint summary

Administrative data

Description of key information

Additional information

Dimethoxy(dimethyl)silane (CAS No. 1112-39-6) hydrolyses rapidly in contact with water (DT50: <0.6 h), to dimethylsilanediol (CAS 1066-42-8) and methanol (CAS No. 67-56-1). Thus, the bioaccumulation assessment is based on the hydrolysis products dimethylsilanediol and methanol rather than on the parent substance. Both hydrolysis products have low log Pow values indicating a low potential for bioaccumulation (dimethylsilanediol: -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.