Registration Dossier
Registration Dossier
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EC number: 211-659-0 | CAS number: 682-01-9
Partition coefficient
Administrative data
Link to relevant study record(s)
Description of key information
Log Kow (substance): 3.4 at 20°C (QSAR)
Log Kow (silanol hydrolysis product): not relevant
Key value for chemical safety assessment
- Log Kow (Log Pow):
- 3.4
- at the temperature of:
- 20 °C
Additional information
The requirement to test the substance for octanol-water partition coefficient is waived because in contact with water the substance hydrolyses rapidly to form silicic acid and propanol. The log Kow of tetrapropyl orthosilicate has been calculated using a validated QSAR. In another source to which no reliability could be assigned, log Kow values of 1.09 and 2 were reported for the substance. Determining the log Kow of the silanol hydrolyis product , silicic acid is not scientifically meaningful, as it is an inorganic.
The non-Si hydrolysis product, propanol has a measured log Kow of 0.34 (Hansch and Anderson 1967).
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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