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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Measured values for the test item, Patchouli oil:
Log Pow 3.2 to 5.7 for peaks 1-3 at 35 °C (OECD 117)
Log Pow > 5.7 for peaks 4 to 10 at 35 °C (OECD 117)

Estimated value for patchouli alcohol entered as key value for the purpose of environmental risk assessmment.

Key value for chemical safety assessment

Log Kow (Log Pow):

Additional information

The HPLC chromatogram of the test material showed a large number of peaks, corresponding to n-octanol/water partition coefficients ranging from 1.8 to more than 5.7. Peaks with a relative peak area of more than 1% were evaluated (10 in total). A significant fraction of the test material was found to have partition coefficients above the highest limit of the calibration range.

Since a significant fraction of Patchouli Oil has partition coefficients > 5.7, the substance is considered to have the potential to bioconcentrate for classification purposes (CLP Regulation EC 1272/2008 cut-off value of ≥ 4) and to meet the screening bioaccumulation criterion (logKow > 4.5) for PBT/vPvB assessment purposes.

For the purpose of the environmental risk assessment, a singe value is required for exposure calculations. Thus the log Kow was estimated for the 3 key constituents using Kowwin v1.68. The values are 3.98 (patchouli alcohol),  6.4 (alpha-bulnesene) and 6.7 (alpha-guaiene).