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Physical & Chemical properties

Vapour pressure

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Description of key information

VP (Pa, 25 deg C) : 0.0127 (Modified Grain method)

Key value for chemical safety assessment

Vapour pressure:
0.013 Pa
at the temperature of:
25 °C

Additional information

Attempts were made to measure the vapour pressure of the test material in a GLP experiment which was conducted in accordance with the standardised guideline OECD 104 using the static method. Based on observations during vapour pressure testing, it was concluded that the test material holds a considerable amount of gas which must be removed by extensive exposure to vacuum. The vapour pressure for the test material was determined to be less than the limit of quantitation (LOQ), 10 Pa, for the test system based upon a final series of observations showing no deflection of the mercury manometer fluid. This limit value is not considered to provide an accurate indication of the true vapour pressure of the substance and hence this measured limit value is reported as supporting data.

The vapour pressure has therefore also been determined by EPIWIN software using the Modified Grain method. Under this method the vapour pressure is calculated to be 0.0127 Pa at 25°C. This is considered to be a more accurate indication of the vapour pressure of the substance and hence is chosen as the key study.