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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

partition coefficient
Type of information:
calculation (if not (Q)SAR)
Adequacy of study:
key study
Study period:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
accepted calculation method
Reason / purpose for cross-reference:
reference to other study
Principles of method if other than guideline:
The results of the organic part of the substance are used for the estimation of log Pow.
GLP compliance:
Type of method:
calculation method (fragments)
Partition coefficient type:
log Pow
Partition coefficient:
ca. 0.12
25 °C
> 13
Remarks on result:
other: due to the decomposition reaction with the formation of sodium hydroxide, the pH will shift into the alkaline region

The log Pow is adopted from the log pow of epsilon-caprolactam.

log pow = 0.12
Executive summary:

An organic salt is expected to have a lower partition coefficient octanol / water, compared with the value for the non ionic parent compound, since the polarity of the substance increases when passing over to an ionised form.

Therefore, the log Pow of 0.12 for epsilon-caprolactame can be considered as an upper limit value for the expected - experimentally not determinable - partition coefficient octanol / water of sodium caprolactamate.

Description of key information

0.12 at 25°C.

Key value for chemical safety assessment

Log Kow (Log Pow):
at the temperature of:
25 °C

Additional information

Read accross from a supporting study (epsilon caprolactam).