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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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 [3-[dimethoxy(methyl)silyl]propanethiol]: 2.9 at 20°C (QSAR)

log Kow [3-(dihydroxymethylsilyl)propanethiol]: 0.5 at 20°C (QSAR)

log Kow [methanol]: -0.82 to -0.64

Key value for chemical safety assessment

Log Kow (Log Pow):
at the temperature of:
20 °C

Additional information

The requirement to conduct a n-octanol/water partition coefficient for the substance is waived because in contact with water, the substance hydrolyses rapidly (half-life 1.4 h at pH 7, 0.1 h at pH 4, 0.03 h at pH 9 and 20-25°C to form 3-(dihydroxymethylsilyl)propanethiol and methanol.

The log Kow of the substance and its silanol hydrolysis product have been predicted using validated QSAR estimation methods to be 2.9 and 0.5 respectively.

Methanol has a reported log Kow of -0.82 to -0.64 (OECD 2004).


OECD (2004): SIDS Initial Assessment Report for SIAM 19, Berlin, Germany, 18-20 October 2004, Methanol, CAS 67-56-1.