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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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Physical & Chemical properties

Partition coefficient

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Link to relevant study record(s)

Description of key information

A chemical analytical study (OECD 117) with pitch, petroleum, arom. [CAS No. 68187-58-6] confirms the result from a previous literature search: Relevant log Pow values range from 4.4 - 6.5, based on HPLC analysis. 

Key value for chemical safety assessment

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

Additional information

In a standard study using the HPLC method (OECD 117), pitch, petroleum, arom. [CAS No. 68187-58-6] was practically insoluble in the common solvent mixture (methanol/water, here: 75+25) and had to be dissolved in tetrahydrofuran (THF) before analysis.

Eight peaks with relative areas >5 % were used for evaluation. They contributed 71.1 % of the total HPLC area under test conditions. The log Pow of the test substance is therefore stated as range of 4.43 - 6.47.

Note: The test substance analysis by GC shows that only a minor part of the test substance is accessible to GC, less than 5 % of the injected amount, the key constituents only representing 0.1 – 0.4 % of the sample. The same applies to HPLC.

The range of Pow values based on selected key components and published log Pow is confirmed by this analytical exercise.

The given maximum log Pow value, an average of published value, relates to benzo[a]pyrene, the marker substance (taken from EU 2008, Tab. 1.6), is continued to be used for risk assessment .


EU (2008). Coal-Tar Pitch, high temperature - Risk Assessment. European Union Risk Assessment Report, The Netherlands []

According to EU 2008, presented data from:

Mackay D, Shiu WY, Ma KC (1992). lllustrated Handbook of Physical-Chemical Properties and Environmental Fate of Organic Chemicals.Lewis Publishers, Boca Raton, FL.