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Physical & Chemical properties

Vapour pressure

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Description of key information

- Key information: Experimentally determined vapour pressure of the test item at 20 °C of 7.9*10e-4 mbar was not in the recommended range of 1 to 1000 mbar for DSC-measurements. Therefore, the Grain Watson estimation based on the lowest possible boiling temperature (according to the definition in the EEC-directive 92/69/EEC, method A.4.) was performed:
vapour pressure (at 20°C) = 1.9*10e-1 Pa.
- Supporting information:
1) Vapour pressure (at 20 °C) = 0.0000096 kPa (= 0.0096 Pa) [software: FORTRAN IV; calculated data]
2) Vapour pressure (at 25 °C) = 0.019 Pa (Modified Grain Method) [MPBPWIN 1.43; calculated data]

Key value for chemical safety assessment

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

Additional information

The vapour pressure of the test item was determined by means of Differential Scanning Calorimetry (DSC) according to the test method A.4. "Vapour Pressure according to the Dynamic Method". However, the experimentally determined vapour pressure of the test item at 20 °C of 7.9*10-4mbar is not in the recommended range of 1 to 1000 mbar for DSC-measurements. Therefore an estimation procedure according to the test method A.4 "Vapour Pressure according to the Dynamic Method" as described in the Official Journal of the European Communities L383A, Appendix 1, Estimation Method, newest version (Robert S. Boethling, Donald Mackay, Handbook of Property Estimation Methods for Chemicals, Lewis Publishers, year of publication 2000, Cap. 3 -Vapour Pressure, Grain-Watson Method, p. 53 - 65) was used. This method is applied for vapour pressures between 103to 10-7mbar. This deviates from the older version published in the test method A.4 "Vapour Pressure according to the Dynamic Method". It was used due to the differentiation between solids and liquids, which results in a more precise estimate. Following this, the test item has a vapour pressure of = 1.8*10e-6 atm ( = 1.9*10e-1 Pa; = 1.9*10e-3 mbar) at 20 °C according to the definition in the EEC-directive 92/69/EEC, method A.4. (Grain Watson estimation; calculation based on the lowest possible boiling temperature).

Supporting information originates from an acute inhalation toxicity study on rats by calculation with the FORTRAN IV Program (1990). The formula is deduced from dry- and wet-bulb readings and results in a value of 0.0000096 kPa (20°C) and 0.000013 kPa (25°C). The air saturation value (maximal concentration to be reached in air at ambient temperature = air saturation) is 1.1 mg/m³ and 2.0992 mg/m³, respectively.

Further, a calculation was performed with US-EPA software EPIWIN/MPBPWIN (v1.43), resulting in a vapour pressure of 0.019 Pa (2011).