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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Partition coefficient (constituents of phenyl silsesquioxanes): 9 at 20°C (QSAR)

Key value for chemical safety assessment

Log Kow (Log Pow):
at the temperature of:
25 °C

Additional information

The determination of the log Kow of phenyl silsesquioxanes as a whole substance is not scientifically meaningful for the purpose of assessment of exposure or risk. The needs associated with a sound understanding of partition coefficient of the substance are adequately met by the available data on constituents. The partition coefficient data for constituents of phenyl silsesquioxanes were determined using a validated QSAR estimation method. The log Kow values for all constituents are >9; this is limited to value of 9. Limiting the log Kow to 9 reflects the reality that higher values can neither be reliably measured nor have any real scientific meaning.