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Partition coefficient

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Description of key information

The partition coefficient of the read-across substance Gas oil (polymer-derived), thermal cracked, full range was reported as a range of log P values of <0 to 5.4 at 40°C.

Key value for chemical safety assessment

Log Kow (Log Pow):
5.4
at the temperature of:
40 °C

Additional information

The partition coefficient of the test substance was determined in accordance with the EU Method A.8 on Partition Coefficient. The partition coefficient was determined by HPLC and was reported as a range of log P values of <0 to 5.4 at 40°C. The test was conducted on Gas oil (polymer-derived), thermal cracked, full range. Gas oil (polymer-derived), thermal-cracked, full-range and Thermal cracking oil from blends of rubber, fuel oils and paraffin waxes, steam-stripped are two very closely related substances. They consist of hydrocarbons having carbon numbers predominantly in the same range (C7 to C32) and boil over a very similar temperature range. The oils contain a relatively large proportion of substituted aromatic hydrocarbons (between 62 and 70%), particularly 1-ring aromatic hydrocarbons. Detailed analytical characterisation shows that the oils have a significant number of individual components in common. Both oils are produced by thermal cracking of the same range of hydrocarbon feedstocks at a temperature of 450-500°C. Thermal cracking oil from blends of rubber, fuel oils and paraffin waxes, steam-stripped differs from Gas oil (polymer-derived), thermal-cracked, full-range in that it has been through a steam-stripping process that removes a proportion of the lower boiling components. In addition to their composition and similar manufacturing process, testing has revealed that the two oils have very similar physico-chemical parameters, especially their solubility in water which is in the region of 3 mg/l suggesting that the two substances might be expected to behave similarly in biological and environmental aqueous environments.

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