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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

The chemical structure and insolubility in water and organic solvents of Pitch, coal tar, high-temp., < 1% 4- to 5-membered condensed ring aromatic hydrocarbons [EC no. 701-305-8]] (CTPhtht) prevents to determine a representative Pow. The determination of a Pow value of the target compound is not applicable but to single PAHs.

Key value for chemical safety assessment

Log Kow (Log Pow):
6.13
at the temperature of:
20 °C

Additional information

More than 99 % of Pitch, coal tar, high-temp., < 1% 4- to 5-membered condensed ring aromatic hydrocarbons [EC no. 701-305-8] is not accessible to chemical analysis due to the absence of identifiable components: Only a residual amount of EPA PAHs of approx. 0.3 - 0.4 % (w/w) can be detected by GC analysis after toluene extraction.

Experimental efforts using the OECD method 117 (HPLC method) failed despite use of the highest methanol/water ratio and tetrahydrofuran as feasible and water-compatible solvent in order to mobilise pitch constituents (see LAUS 2014). The log Pow relates to benzo[a]pyrene.