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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2006-05-04 to 2006-07-17
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
1992
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
1995
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
dynamic method
Key result
Temp.:
25 °C
Vapour pressure:
3.3 Pa
Remarks on result:
other: calculated value

The vapour pressure was measured with the dynamic method in the temperature range of 82 °C to 198 °C. The values for 20, 25 and 50 °C are calculated, using the Antoine constants A, B and C as shown.


 


Validity criteria for the measurement of the vapour pressure:

























Target condition according to
guideline:
Actual condition according to
the study:
Validity criteria met:
At least two vapour pressure and temperature values - and preferably three or more – are required in the range 0 to 50 °C (or 120 to 150 °C).

Temperatures tested ranged between 82 - 198 °C.


The mean of two measurements is stated.


Yes
A log p versus 1 /T curve should be stated.A log p versus 1/T curve is given in the raw data.Yes
An estimate of the vapour pressure at 20 or 25 °C should be stated.Values for 20 and 25 °C are given.Yes

 

Conclusions:
The Antoine constants from the regression of the data from the dynamic method were used to calculate the vapour pressure for the test item at 25 °C, which was found to be 3.3 Pa.
Executive summary:

The Antoine constants from the regression of the data from the dynamic method were used to calculate the vapour pressure for the test item at 25 °C, which was found to be 3.3 Pa.


























T/°C



p/hPa



p/Pa



20



1.4 x 10-2



1.4



25



3.3 x 10-2



3.3



50



7.8 x 10-2



78


Description of key information

The Antoine constants from the regression of the data from the dynamic method were used to calculate the vapour pressure for the test item at 25 °C, which was found to be 3.3 Pa.

Key value for chemical safety assessment

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

Additional information