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Physical & Chemical properties

Vapour pressure

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vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
according to guideline
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
Using the thermobalance method Instead of the gas saturation method
Principles of method if other than guideline:
The thermobalance method has been developed (see B.F. Rordorf, A. Geoffroy, M. Szelagiewicz, and E. Marti, "Vapour Pressure Methods for Industrial Applications" in Thermal Analysis, Proc. 6th Int. Conf. Therm. Anal. Vol. I, ed. H.G. Wiedemann, Birkhauser, Basel, 1980, p. 313)

The validity of the thermobalance method was tested with benzoic acid. The agreement with literature was extremely good (e.g. OECD Guideline No. 104, p. 4 )
GLP compliance:
Type of method:
effusion method: vapour pressure balance
Key result
Test no.:
109 °C
Vapour pressure:
11 Pa
Remarks on result:
other: measured
Key result
Test no.:
25 °C
Vapour pressure:
0.007 Pa
Remarks on result:
other: extrapolated

Heat of evaporation: 82.9 kJ/mol

Volatiles in temperature region 25°C to 94°C = 0.3%

The vapour pressure of the test substance was extrapolated to be 0.0071 Pa at 25°C

Description of key information

Extrapolated vapour pressure = 0.0071 Pa at 25°C based on experimental value of 11 Pa at 109°C

Key value for chemical safety assessment

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

Additional information

The vapour pressure was measured by thermogravimetry (diffusion controlled evaporation)