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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Log Kow (substance): Not relevant
Log Kow (Silanol Hydrolysis product, dimethylsilanol): 0.6 at 20°C
Log Kow (Silanol Hydrolysis product, dimethylsilanediol): -0.4 at 20°C

Key value for chemical safety assessment

at the temperature of:
20 °C

Additional information

The requirement to test the substance for n-octanol-water partition coefficient is waived because in contact with water the substance hydrolyses very rapidly. 

The partition coefficients of the hydrolysis products dimethylsilanol and dimethylsilanediol are relevant. Log Kowvalues of 0.6 and -0.4 at 20°C have been calculated for dimethylsilanol and dimethylsilanediol, respectively, using an appropriate QSAR.