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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

2 data are available at standard temperature (EPI SuiteTM  software program):
- log Kow = 2.54 (calculation model KOWWIN v1.76)
- log Kow = 2.42 (experimental data base - Sangster)

Key value for chemical safety assessment

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

Additional information

No full report of experimental study is available for the partition coefficient of heptanoic acid.

As the applicability of the EPIWIN program (KowWin v1.67) for the estimation of logKow values of heptanoic acid has been demonstrated by the QPRF, this calculated value is considered acceptable and its reliability is considered as "2".

The estimated logKow values is consitent with the experimental data reported in the experimental data base of the model (Sangster).

Thus, the value of partition coefficient selected for the risk asssement is the higher value => log Pow =2,54.

This value indicates a low potential for heptanoic acid to accumulate from water into organisms.