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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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 to dimethylsilanediol (DMSD) and methanol under environmental conditions (DT50 < 0.6 h at pH 7, pH 9 and 25 °C). Thus, the environmental fate assessment is based on the hydrolysis products dimethylsilanediol and methanol rather than the parent substance.

Both hydrolysis products exhibit a low potential for adsorption to soil, sediment or sludge. The volatilization from water is very low for DMSD (HLC = 1.65E-4 Pa m³/mole Pa m³/mole at 12 °C), whilst being higher for methanol (HLC = 0.3827 Pa m³/mole at 25 °C), owing to the high vapor pressure of the latter.

However it was shown that considerable quantities of DMSD are subject to volatilization from soil into the atmosphere (Lehmann and Miller, 1996; Xu and Miller, 2016) or subject to evapotranspiration in plant-covered soils (Xu and Miller, 2017).