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Physical & Chemical properties

Partition coefficient

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Description of key information

Log Kow for the 3 main constituents of 1,4-benzenediamine, N,N'-mixed Ph and tolyl derivatives are: 3.3  ; 3.9 and 4.6.
N,N'-diphenyl-p-phenylenediamine; R-59; CAS: 74-31-7: log Kow = 3.3
N-(2-methylphenyl)-N'-phenylbenzene-1,4-diamine; R-1679; CAS: 27173-16-6: log Kow = 3.9
N,N'-bis(2-methylphenylbenzene)-1,4-diamine; R-898; CAS: 15017-02-4: log Kow = 4.6

Key value for chemical safety assessment

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

Additional information

Three study reports describing the determination of the n-octanol water partition coefficient are available.

Two of them are conducted per GLP and OECD guidelines, and the resulting values for log Kow are in good agreement. As the results are so closely together, the most recent study is chosen as the key study.

The log Kow value for DAPD, 3.93, was calculated as the average of log Kow of the 3 main components.