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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:
3-4 Mar 1991
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Also according to GLP.
according to guideline
EU Method A.4 (Vapour Pressure)
GLP compliance:
Type of method:
effusion method: vapour pressure balance
25 °C
Vapour pressure:
0 Pa
Remarks on result:
other: The statistical errors indicated represent an error range of about 23 %


During initial pumpdown the observed vapour pressure of the sample at ambient temperature fell from around 2x10-2 Pascals using the rotary pump only to below the observable threshold (<5x10-4 Pascals) when the diffusion pump was used. On warming to 91 °C a vapour pressure of 7.8x10-4 Pascals was observed representing a rate of pumping of sample of around 0.1 μg per hour. The sample was then further pumped overnight at 100 -105 °C before Run 1 was performed and over this period the vapour pressure fell to below the detection limit. After Run 1 the sample was found to have remained intact after the measurements and consequently the vapour pressure determination is considered appropriate to the bulk of the substance. The vapour pressure at 25 °C obtained via extrapolation of the indicated vapour pressure reationship was 3.458x10-7 Pa.

Log Vp (Pa) = (-3719.373 / Temp (K)) + 0.6014

The vapour pressure of the test item was 3.458 x 10-7 Pa at 25°C.
Executive summary:

The vapour pressure of test item was determined according to the EC A.4 method in compliance with GLP.

The test material has been determined to have a vapour pressure of 3.458 x 10-7 Pa at 25°C using the vapour pressure balance effusion method.

Description of key information

3.458E-07 Pa at 25 °C

Key value for chemical safety assessment

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

Additional information

The vapour pressure of the substance was determined at 25 °C according to EEC Method A.4 (1984). The effusion method (vapour pressure balance) was applied.