Registration Dossier
Registration Dossier
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EC number: 217-982-3 | CAS number: 2031-62-1
Endpoint summary
Administrative data
Description of key information
Additional information
Diethoxy(methyl)silane (CAS 2031-62-1) hydrolyses rapidly under
environmental relevant conditions (half-life < 2 min at pH 4, 7 and 9
and 25 °C). Hydrolysis products are methylsilanediol, methylsilanetriol
and ethanol. The hydroylsis is stepwise depending on pH
(methylsilanediol followed by methylsilanetriol). Diethoxy(methyl)silane
is not readily biodegradable. The parent substance might volatilize to
the atmospheric compartment based on the vapour pressure of 840 Pa at 20
°C. However, its silanol hydrolysis product exhibit low volatility (6.5
Pa and 5.3E-02 Pa at 25 °C for methylsilanediol and methylsilanetriol,
respectively). Due to the fast hydrolysis in contact with water,
volatilization is not considered to be a relevant distribution pathway.
Nevertheless, if released to the atmosphere DT50 values of 1.3 d for the
parent substance and 1.5 - 2.3 d were calculated for the silanol
hydrolysis products, respectively indicating potential degradation in
contact with OH-radicals.
Diethoxy(methyl)silane has a low potential for adsorption to soil and
sediment due to the low log Kow value (parent: 1.7 (20 °C, QSAR),
hydrolysis products: -1.0 (methylsilanediol), -2.4 (methylsilanediol)
and -0.3 (ethanol) at 20 °C). Taking all these information on the
substance into account the surface water is considered to be the main
compartment of environmental distribution.
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