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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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Physical & Chemical properties

Partition coefficient

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Description of key information

By applying the HPLC method according to OECD Guideline 117, the partition coefficient Log Kow of n-butyl-4,4-bis(tert-butylperoxy)valerate has been determined to be 6.34.

Key value for chemical safety assessment

Log Kow (Log Pow):
6.34
at the temperature of:
55 °C

Additional information

A study was performed according to OECD Guideline 117 with GLP statement to determine the partition coefficient ofn-butyl-4,4 -bis(tert-butylperoxy)valerateby applying the HPLC method (Chastenet, 2017). The test was considered as valid. The partition coefficient Log Kow of the test item is 6.34 at 55°C.