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Physical & Chemical properties

Partition coefficient

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Description of key information

n-octanol-water partition coefficient, D3 = 4.4
n-octanol-water partition coefficient, DMSD = -0.4

Key value for chemical safety assessment

at the temperature of:
20 °C

Additional information

The substance is hydrolytically unstable (half-life at pH 7 and 25°C = 23 min) and, therefore, the Log Kow of the hydrolysis product dimethylsilanediol (DMSD) is more relevant than that of the substance. A partition coefficient value of -0.4 was obtained for DMSD using an appropriate calculation method; this is assigned as key study.

The partition coefficient of the substance, D3, has been calculated to be 4.4 (Kozerski 2007). A measured Log Kow of 3.9 has been reported (Bruggeman 1984), however, there is not enough information to validate the HPLC method used for use with siloxane substances and recent measurements for other siloxanes indicate that the HPLC method underestimates the Log Kow.