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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:
2016
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
comparable to guideline study with acceptable restrictions
Qualifier:
equivalent or similar to guideline
Guideline:
other: ASTM D 2879 - 98 (2007)
Deviations:
yes
Remarks:
Instead of the mercury monometer stipulated for measurement in the ASTM method, a digital electornic pressure gauge was used.
GLP compliance:
no
Type of method:
isoteniscope
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
5.2 mm Hg
Test no.:
#2
Temp.:
20 °C
Vapour pressure:
5.3 mm Hg
Test no.:
#3
Temp.:
20 °C
Vapour pressure:
5.2 mm Hg
Key result
Temp.:
20 °C
Vapour pressure:
5.23 mm Hg
Remarks on result:
other: average of three runs
Test no.:
#1
Temp.:
50 °C
Vapour pressure:
32.3 mm Hg
Test no.:
#2
Temp.:
50 °C
Vapour pressure:
32.5 mm Hg
Test no.:
#3
Temp.:
50 °C
Vapour pressure:
32.4 mm Hg
Temp.:
50 °C
Vapour pressure:
32.4 mm Hg
Remarks on result:
other: average of three results
Conclusions:
The average vapour pressures recorded were 5.23 mmHg at 20 °C and 32.4 mmHg at 50 °C.
Executive summary:

Vapour pressure was determined using a modified version of the method ASTM D 2879 - 97 (2007). In this study the sample was well mixed before being placed in the sample cell, which was then connected to the vacuum and pressure measurement systems. The sample was cooled to minus 20 °C and subjected to slow evacuation in order to remove entrained air. Five cooling/evacuation procedures were carried out before the sample cell pressure was reduced to less than 0.1 torr. Sample and measurement systems were placed in a water baths maintained at 20 °C and 50 °C, respectively and the pressure attained at equilibrium noted. Three measurements were made at each temperature, using fresh sample for each test. The average vapour pressures recorded were 5.23 mmHg at 20 °C and 32.4 mmHg at 50 °C.

Description of key information

Vapour pressure was determined using a modified version of the method ASTM D 2879 - 97 (2007). In this study the sample was well mixed before being placed in the sample cell, which was then connected to the vacuum and pressure measurement systems. The sample was cooled to minus 20 °C and subjected to slow evacuation in order to remove entrained air. Five cooling/evacuation procedures were carried out before the sample cell pressure was reduced to less than 0.1 torr. Sample and measurement systems were placed in a water baths maintained at 20 °C and 50 °C, respectively and the pressure attained at equilibrium noted. Three measurements were made at each temperature, using fresh sample for each test. The average vapour pressures recorded were 5.23 mmHg at 20 °C and 32.4 mmHg at 50 °C.

Key value for chemical safety assessment

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

Additional information