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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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.