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Physical & Chemical properties

Partition coefficient

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Description of key information

A log Kow value of 7 (approximately the middle range of the measured values) has been determined to be representative.

Key value for chemical safety assessment

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

Additional information

The octanol-water partition coefficient of two C16 chlorinated paraffins was determined by high-performance liquid chromatography (HPLC) using 14C-labelled materials. The mean log Kow value for the 35% chlorinated paraffin (range 4.7-8.3) was 7.2 and the corresponding value for the 69% chlorinated material (range 6.9-7.8) was 7.4 (Fisk et al. 1998).


Using reversed phase high performance thin layer chromatography, the octanol-water partition coefficients for components of two MCCPs have been determined. The derived partition coefficients, expressed as log Pow values, varied from 5.52-8.21 and between 5.47-8.01 for the 45% and 52% chlorinated C14-17 paraffins, respectively (Renberg et al. 1980).


Calculated values for log Kow between 5.5 and >6 are reported in IUCLID for MCCPs (EU, 2005).


Log Kow values of 6.95 for a C14 chlorinated paraffin (42% chlorinated), 6.37 for a C14 chlorinated paraffin (57% chlorinated), 8.54 for a C17 chlorinated paraffin (38% chlorinated) and 7.94 for a C17 chlorinated paraffin (58% chlorinated) have been calculated using the CLOGP 3.4 computer program (BUA, 1992).


Overall, a log Kow value of 7 (approximately the middle of the range of measured values) will be used as a representative value.