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Diss Factsheets

Physical & Chemical properties

Vapour pressure

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
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:
Not specified
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
Not specified
Deviations:
yes
Remarks:
Vapour pressure at temperatures 20-25°C was not determined.
GLP compliance:
not specified
Type of method:
effusion method: Knudsen cell
Key result
Test no.:
#9
Temp.:
ca. 150 °C
Vapour pressure:
ca. 0.003 Pa
Remarks on result:
other: Standard deviation of 0.002019
Key result
Test no.:
#8
Temp.:
ca. 135 °C
Vapour pressure:
ca. 0.002 Pa
Remarks on result:
other: Standard deviation of 0.002870
Key result
Test no.:
#7
Temp.:
ca. 120 °C
Vapour pressure:
ca. 0.003 Pa
Remarks on result:
other: Standard deviation of 0.001388
Key result
Test no.:
#6
Temp.:
ca. 105 °C
Vapour pressure:
ca. 0.005 Pa
Remarks on result:
other: Standard deviation of 0.001732
Key result
Test no.:
#5
Temp.:
ca. 90 °C
Vapour pressure:
ca. 0.004 Pa
Remarks on result:
other: Standard deviation of 0.004849
Key result
Test no.:
#4
Temp.:
ca. 75 °C
Vapour pressure:
ca. 0.008 Pa
Remarks on result:
other: Standard deviation of 0.005261
Key result
Test no.:
#3
Temp.:
ca. 60 °C
Vapour pressure:
ca. 0.001 Pa
Remarks on result:
other: Standard deviation of 0.0007372
Key result
Test no.:
#2
Temp.:
ca. 45 °C
Vapour pressure:
ca. 0.001 Pa
Remarks on result:
other: standard deviation of 0.001116
Key result
Test no.:
#1
Temp.:
ca. 30 °C
Vapour pressure:
ca. 0.001 Pa

Results:


Vapour pressure was examined at nine different temperatures. No temperatures could be evaluated as they showed no reproducible or relevant weight loss. As a calculation on the base of the measured weight losses is not possible, the highest vapour pressure, derived from all measurements, is stated as the limit value. Vapour pressure at 75°C: 1.07* 10-02 Pa.


 


Positive control:


For Diethylphthalate the following vapour pressure was determined and compared with the recommended value:














Vapour pressure (positive control) at 30°C:



1.96*10-1 Pa



Criteria for the vapour pressure of the positive control


at 30°C



1.44*10-1 ± 0.1Pa



The vapour pressure met the validity criteria. Therefore, the study can be considered as valid.

Conclusions:
Under the study conditions, the vapour pressure of the test substance was measured at 9 different temperature but as they showed no reproducible or relevant weight loss. As a calculation on base of the measured weight losses is not possible, the highest vapour pressure, derived from all measurements, is stated as limit value, which is 1.07* 10-02 Pa at 75°C.
Executive summary:

The study was performed with the test substance in accordance with OECD TG 104 and EU A.4 guidelines. Effu­sion method: Knudsen Cell method was used to determine the vapour pressure at 9 different temperatures of 30, 45, 60, 75, 90, 105, 120, 135, and 150°C. As it was not technically feasible to measure a vapour pressure below 30°C and as the test substance showed no reproducible weight loss, no temperatures were evaluated. So the calculation base on the measured weight loss was not possible. Under this circumstance, the highest vapour pressure, derived from all measurements, is stated as limit value, which is <1.07* 10-02 Pa (Lucht, 2020).

Description of key information

The vapour pressure was determined according to OECD Guideline 104 and EU Method A.4 (Lucht, 2020)

 

Key value for chemical safety assessment

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

Additional information

The test substance showed no reproducible weight across the measurement temperatures, therefore it was not possible to state a log p versus 1/T curve and to calculate on the basis of the measured weight losses. As a result, the highest vapour pressure, derived from all measurements, is stated as the limit value.