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Physical & Chemical properties

Vapour pressure

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Description of key information

vapour pressure (whole substance):   0.23 Pa, 0.44 Pa and 7.1 Pa at 20°C, 25°C and 50°C respectively (measured)
vapour pressure (individual constituents): 1.1E-01 to 11.5 Pa at 25°C (QSAR)

Key value for chemical safety assessment

Vapour pressure:
0.23 Pa
at the temperature of:
20 °C

Additional information

Vapour pressure values of 0.23 Pa, 0.44 Pa and 7.1 Pa at 20°C, 25°C and 50°C respectively were determined for the substance using the dynamic method in accordance with OECD 104 test method. The measurements were made at several temperatures (96.8 to approximately 256.15°C), therefore linear regression analysis was used to calculate the vapour pressures at 20°C, 25°C and 50°C. The result is considered to be reliable and selected as key study.

Since the submission substance is a UVCB substance, the vapour pressure 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.

The 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 Section 13).

As supporting information, the vapour pressure of the individual constituents was determined using a separately validated QSAR estimation method. Vapour pressure in the range 1.1E-01 to 11.5 Pa at 25°C were determined for the constituents of the registration substance.