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Physical & Chemical properties

Vapour pressure

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Description of key information

Vapour pressure: < 2.35 x 10EXP-24 Pa (calculated based on modified Watson Correlation in annex of the OECD 104)

Key value for chemical safety assessment

Additional information

Since the vapour pressure of the test item was expected to be so small that the value would be below the measurement limit of any experimental determination, e.g.the gas saturation method, the vapour pressure had to be calculated using the modified Watson correlation. This method is described by Lyman et al. (1990).

The boiling point of the component with the smallest molecular weight of the test substance was calculated to be approximately 478°C using Meissner's method. The vapour pressure was estimated for the three main components based on the boiling point calculated and using the Modified Watson Correlation. For the component with the smallest boiling point the vapour pressure was calculated to be 2.35x10EXP-24 Pa. For the components with higher molecular weights, the respective vapour pressure calculated were even smaller.