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Physical & Chemical properties

Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
from 2021-05-12 to 2021-05-13
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
2009
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: Knudsen cell
Key result
Temp.:
20 °C
Vapour pressure:
0.006 Pa
Temp.:
25 °C
Vapour pressure:
0.009 Pa

The vapour pressure was measured in the temperature range of 110 to 170 °C. For the evaluation the vapour pressure values in the range of 120 to 170 °C were used. The measured vapour pressure values together with the measured temperatures and the regression data of the vapour pressure curve can be seen in Tables 1 and 2, respectively.











































































Table 1. Results of the Effusion method



 



Temperature, °C



Δm/Δt, mg/min



Vapour pressure, Pa



 



120.0



7.7121 x 10-3



1.2130



 



130.0



7.4799 x 10-3



1.1914



 



140.0



1.8174 x 10-2



2.9303



 



150.0



2.2533 x 10-2



3.6769



 



160.0



2.5308 x 10-2



4.1783



 



170.0



3.5975 x 10-2



6.0074



 



Table 2. Regression data of the vapour pressure curve - Regression output



 



Intercept



Slope



R. Squared



 



6.6572



-2598.7329



0.9206


    

The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20 and 25 °C to be 0.0062 Pa and 0.00873 Pa, respectively.

Conclusions:
The vapour pressure of the test item was determined to be 0.0062 Pa and 0.00873 Pa at 20 and 25 °C, respectively.
Executive summary:

An experimental study was conducted to determine the vapour pressure of the test item according to Regulation (EC) No. 440/2008 Method A.4. and OECD Test Guideline 104 (2006) using the effusion method (Knudsen cell). The vapour pressure at 20 and 25 °C was extrapolated from the linear regression of the vapour pressure curve of the measurements performed in the range of 120 to 170 °C. The vapour pressure of the test item was determined to be 0.0062 Pa and 0.00873 Pa at 20 and 25 °C, respectively.

Description of key information

The vapour pressure of the test item was determined to be 0.0062 Pa and 0.00873 Pa at 20 and 25 °C, respectively.

Key value for chemical safety assessment

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

Additional information

An experimental study was conducted to determine the vapour pressure of the test item according to Regulation (EC) No. 440/2008 Method A.4. and OECD Test Guideline 104 (2006) using the effusion method (Knudsen cell). The vapour pressure at 20 and 25 °C was extrapolated from the linear regression of the vapour pressure curve of the measurements performed in the range of 120 to 170 °C. The vapour pressure of the test item was determined to be 0.0062 Pa and 0.00873 Pa at 20 and 25 °C, respectively.