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Physical & Chemical properties

Vapour pressure

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Description of key information

vapour pressure (whole substance): 0.04 to 34 Pa at 20°C (read-across)
vapour pressure (individual constituents): 3.4E-02 to 330 Pa at 25°C (QSAR)

Key value for chemical safety assessment

Additional information

There are no reliable measured vapour pressure data for the registration substance. However, reliable data are available for related substances in the relevant carbon number range, including other Fischer-Tropsch process-derived substances.

In OECD 104 studies using the dynamic method, which were conducted in compliance with GLP, Hydrocarbons, C10-C13, n-alkanes, isoalkanes, <2% aromatics (GS160) had vapour pressure values of 34 Pa at 20°C, 51 Pa at 25°C and 300 Pa at 50°C. Hydrocarbons, C12-C15, n-alkanes, isoalkanes, <2% aromatics (GS215) had vapour pressure values of 4 Pa at 20°C, 6.7 Pa at 25°C and 58 Pa at 50°C. Hydrocarbons, C14-C16, n-alkanes, isoalkanes, <2% aromatics (GS250) had vapour pressure values of 0.23 Pa at 20°C, 0.44 Pa at 25°C and 7.1 Pa at 50°C and Hydrocarbons, C15-C19, n-alkanes, isoalkanes, <2% aromatics (GS270) had vapour pressure values of 0.04 Pa at 20°C, 0.08 Pa at 25°C and 1.5 Pa at 50°C. The results are considered to be reliable and are used as weight of evidence.

Since the submission substance is a UVCB substance, the vapour pressures of the individual constituents are also important. Measured vapour pressure for the whole substance is preferred for the purpose of human health exposure assessment while the vapour pressure of individual constituents is useful for environmental risk characterisation.

This endpoint can be characterised using quantitative structure property relationships for representative hydrocarbon structures that comprise the hydrocarbon blocks used to assess the environmental risk of this substance with QSAR software (see IUCLID Section 13).

As supporting information, the vapour pressure values of the individual constituents were determined using a separately validated QSAR estimation method. Vapour pressures in the range 3.4E-02 to 330 Pa at 25°C were determined for the constituents of the registration substance.