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Physical & Chemical properties

Vapour pressure

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Description of key information

The vapour pressure of the test substance was determined to be 1.8 x 10-8, 3.1 x 10-8 and 3.8 x 10-7 hPa, at 20 , 25 and 50 °C respectively (Franke J, 2002).

Key value for chemical safety assessment

Vapour pressure:
0 hPa
at the temperature of:
20 °C

Additional information

A study was conducted to determine the vapour pressure of the test substance according to a guideline study in compliance with GLP. The test substance was purified by degassing at 40±5°C under vacuum at approximately 10E-5 hPa, for 18 h and subsequently a second time at 100±2°C under vacuum at approximately 10E-5 hPa overnight. The vapour pressure of the purified test substance was determined by effusion method (vapour pressure balance). Based on the observations and calculations, the vapour pressure determined at 20, 25 and 50°C was 1.8 x 10E-8 hPa, 3.1 x 10E-8 hPa and 3.8 x 10E-7 hPa, respectively (Franke J, 2002).

In another guideline compliant study the vapour pressure of the test substance was determined by isothermal thermogravimetry. Under the conditions of the study, the vapour pressure was determined to be <0.0015 Pa (i.e., equivalent to <1.1 x 10E-5 mm Hg) at 20°C and <0.0058 Pa (i.e., equivalent to <4.3 x 10E-5 mm Hg) at 25°C (Brekelmans MJC, 2012).