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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

The partition coefficient, log Pow, of 1,3 (or 1,4)-bis[1-(tert-butylperoxy)-1-methylethyl]benzene was calculated using the respective solubility in n-octanol and water and was determined to be > 5.5. Therefore, the log Pow of 1,3 (or 1,4)-bis[1-(tert-butylperoxy)-1-methylethyl]benzene was also estimated by a model calculation based on the theoretical fragmentation of the molecule into suitable structures for which reliable log Pow values were used. The final result was estimated to be log Pow = 7.3 using a model calculation, which is based on theoretical fragmentation.

Key value for chemical safety assessment

Log Kow (Log Pow):
7.3
at the temperature of:
20 °C

Additional information

The water solubility of 1,3 (or 1,4)-bis[1-(tert-butylperoxy)-1-methylethyl]benzene at 20°C was determined to be below the concentration of the lowest calibration point which is < 0.62 mg/l using the column elution method. The partition coefficient, log Pow, of 1,3 (or 1,4)-bis[1-(tert-butylperoxy)-1-methylethyl]benzene was calculated using the respective solubility in n-octanol and water and was determined to be > 5.5. Therefore, the log Pow of 1,3 (or 1,4)-bis[1-(tert-butylperoxy)-1-methylethyl]benzene was also estimated by a model calculation based on the theoretical fragmentation of the molecule into suitable structures for which reliable log Pow values were used. The final result was obtained by summing the fragment values and the correction terms. In conclusion, the log Pow of 1,3 (or 1,4)-bis[1-(tert-butylperoxy)-1-methylethyl]benzene was estimated to be log Pow = 7.3 using a model calculation, which is based on theoretical fragmentation.