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Physical & Chemical properties

Partition coefficient

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Description of key information

In accordance with column 2 of REACH Annex VII, the study does not need to be conducted as the substance is hydrolytically unstable at pH 7
(half-life 7 hours).

Key value for chemical safety assessment

Log Kow (Log Pow):
5.17
at the temperature of:
20 °C

Additional information

A calculated value of 5.17 for 7PPD was received using KOWWIN v1.68 included in EPISuite v 4.11, ©2000 - 2012.

4-Hydroxydiphenylamine CAS 122-37-2 was identified as the primary hydrolysis product. The hydrolysis product 4-Hydroxydiphenylamine is characterized by a logKow of 2.46 being calculated with KOWWIN v1.68 included in EPISuite v 4.11, ©2000 - 2012 (Currenta, 2016). The oxides form of 4- HDPA ("N-Oxide") yielded a logKow of -1.7 to 0.9 (depending on the structure of tautomers).