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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 2021-05-26 to 2021-06-23
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)
Deviations:
no
GLP compliance:
no
Type of method:
effusion method: Knudsen cell
Key result
Temp.:
25 °C
Vapour pressure:
0.029 Pa
Temp.:
20 °C
Vapour pressure:
0.017 Pa
Vapour pressure:
0.38 Pa

Thermal Stability


In the temperature range up to 300 °C no significant endothermic or exothermic effect could be detected.
















Sample weight / atmosphere



Start / °C



Energy / J/g



7.00 mg / air



-



-



 


Effusion method: Knudsen cell


The vapour pressure was measured in the temperature range of 24 to 74 °C.


































Temperature / °C



Vapour pressure / Pa



24



0.03



34



0.08



44



0.21



54



0.55



64



1.41



74



3.33



 


The logarithm of the vapour pressure was plotted as a function of the inverse temperature.


The measured vapour pressure is slightly outside the measuring range (10-3 to 1 Pa) of the Knudsen cell. Nevertheless, as the vapour pressure value above 1 Pa could be detected properly by the Knudsen cell, this value can be used for the evaluation.


From the measured data points of the vapour pressure curve the constants A and B of the Antoine equation.


 


From the measured data points of the vapour pressure curve the constants A and B of the Antoine equation.


Antoine equation: log p = A + [B / (C + T)]


A = 12.8261


B = -4282.56


C = 273.15


T = Temperature in °C


The vapour pressure of the test item calculated by interpolation and extrapolation, respectively, of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C.






















Temperature / °C



Vapour pressure / Pa



20



1.7E-2



25



2.9E-2



50



3.8E-1


Conclusions:
The vapour pressure of the test item was determined to be 2.9E-2 Pa at 25 °C.
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 10 to 150 °C. The vapour pressure of the test item was determined to be 1.7E-2 Pa, 2.9E-2 Pa and 3.8E-1 at 20, 25 and 50 °C, respectively.

Description of key information

The vapour pressure of the test item was determined to be 2.9E-2 Pa at 25 °C.

Key value for chemical safety assessment

Vapour pressure:
0.029 Pa
at the temperature of:
25 °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 10 to 150 °C. The vapour pressure of the test item was determined to be 1.7E-2 Pa, 2.9E-2 Pa and 3.8E-1 at 20, 25 and 50 °C, respectively.