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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Physical & Chemical properties

Partition coefficient

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Administrative data

Link to relevant study record(s)

Description of key information

The Log Kow of test item should be understood based on its degradation products since it undergoes rapid hydrolysis (half-life < 1h) in aqueous to acetone oxime (log Kow = 1.20, KOWWIN v1.68) and ethylsilanetriol (Log Kow = -1.87, KOWWIN v1.68).

Key value for chemical safety assessment

Log Kow (Log Pow):

Additional information

According to Column 2 of REACH Annex VII, the study cannot be conducted since the substance undergoes rapid hydrolysis (half-life < 1h) in aqueous to acetone oxime and ethylsilanetriol. Morevoer, the corresponding silanols undergo continuous condensation reactions to produce higher molecular weight siloxanes which are considered biologically unavailable.

The estimated log octanol-water partition coefficients (Log Kow) for the degradation products, acetone oxime and ethylsilanetriol were 1.20 and -1.87(EPI-Suite, KOWWIN v1.68). Moreover, according to Jaros et al (2007) the Log Kow of acetone oxime was reported to be 0.20.