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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
Study period:
2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
GLP compliance:
yes (incl. QA statement)
Type of method:
static method
Test no.:
#1
Temp.:
20.5 °C
Vapour pressure:
77.15 Pa
Remarks on result:
other: Run 1
Test no.:
#2
Temp.:
30.1 °C
Vapour pressure:
180 Pa
Remarks on result:
other: Run 1
Test no.:
#3
Temp.:
50.1 °C
Vapour pressure:
480 Pa
Remarks on result:
other: Run 1
Test no.:
#4
Temp.:
60.1 °C
Vapour pressure:
720 Pa
Remarks on result:
other: Run 1
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
72.59 Pa
Remarks on result:
other: Run 2
Test no.:
#2
Temp.:
30 °C
Vapour pressure:
300 Pa
Remarks on result:
other: Run 2
Test no.:
#3
Temp.:
40 °C
Vapour pressure:
580 Pa
Remarks on result:
other: Run 2
Test no.:
#4
Temp.:
50 °C
Vapour pressure:
860 Pa
Remarks on result:
other: Run 2
Test no.:
#5
Temp.:
60 °C
Vapour pressure:
1 230 Pa
Remarks on result:
other: Run 2

Run 1: Starting pressure 0.0009 mbar. The sample was degassed for 22 hour period. Significant degassing was observed for approximately an hour.

Run 2: Starting pressure 0.002 mbar. The sample was degassed for 18 hour period. Significant degassing was observed for approximately an hour.

Both vapour pressure curves exhibit a degree of curvature and this may be due to the polymeric nature of the test material or the presence of residual amounts of volatile component present after the degassing process. However it is suspected that due to the viscosity of the test sample it is very difficult to completely remove all the volatile components present prior to testing.

It is suspected that the variation in the values observed at various temperatures during the vapour pressure determinations is due to a small amount of volatile components present that could not be removed after approximately 20 hour of degassing under vacuum.

Due to the curvature of the graphs observed in the test data it is not considered to be correct to report the mean or range of the extrapolated values as the result. Therefore the result reported will be the direct measurement taken at 20.0C in Run 2.

Conclusions:
Vapour pressure curve exhibits a degree of curvature. It is suspected that the variation in the values observed at various temperatures during the vapour pressure determinations is due to a small amount of volatile components present that could not be removed after approximately 20 hours of degassing under vacuum.
Vapour pressure of the test item is 72.59 Pa at 20°C (after 18 hours of degassing).

Description of key information

Key value for chemical safety assessment

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

Additional information

Vapour pressure curve exhibits a degree of curvature. It is suspected that the variation in the values observed at various temperatures during the vapour pressure determinations is due to a small amount of volatile components present that could not be removed after approximately 20 hours of degassing under vacuum.

Vapour pressure of the test item is 72.59 Pa at 20°C (after 18 hours of degassing).