Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

Log Kow (dimethoxy(methyl)vinylsilane): 2.3 at 20°C (QSAR)
Log Kow (methylvinylsilanediol): -0.1 at 20°C (QSAR)
Log Kow (methanol) = -0.82 to -0.64 (measured)

Key value for chemical safety assessment

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

Additional information

The requirement to test the registration substance for n-octanol/water partition coefficient is waived because in contact with water the substance hydrolyses rapidly to form methylvinylsilanediol and methanol. The half-lives are <<2 min at pH 4, 18.3 min at pH 7 and 0.7 min at pH 9 and 25°C.

The log Kow of the registration substance and its silanol hydrolysis product have been calculated using a validated QSAR to be 2.3 and -0.1 respectively at 20°C.

Methanol has a measured 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.