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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:
29.04. - 03.07.02
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: vapour pressure balance
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0 hPa
Key result
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0 hPa
Test no.:
#3
Temp.:
50 °C
Vapour pressure:
0 hPa

The vapour pressure was measured in the temperature range of 25 to 111 °C. Above 39°C a vapour pressure could be measured. The following table shows the measured pressure data at the corresponding temperatures.

 

Temperature [°C]

vapour pressure [hPa]

39.5

1.3 x 10E-5

43.1

3.4 x 10E-5

46.8

3.9 x 10E-5

50.6

5.7 x 10E-5

55.2

8.0 x 10E-4

62.3

1.8 x 10E-4

68,2

3.7 x 10E-4

76.9

8.9 x 10E-3

84.2

1.8 x 10E-3

66.9

2.2 x 10E-3

94.9

4.7 x 10E-3

100.4

7.8 x 10E-3

106.5

1.3 x 10E-2

111.0

1.9 x 10E-2

 

The values for 20, 25 and 50 °C are calculated, using the Antoine constants A, B and C. 

The calculated vapour pressure values are extrapolated:

 

p (20 °C) = 1.2-10E-4 Pa

p (25 °C) = 2.4- 10E-4 Pa

p (50 °C) = 5.3- 10E-3 Pa

 

Conclusions:
The vapour pressure at 20 °C was determined to be 1.2E-4 Pa and at 25 °C to be 2.4E-4 Pa respectively.
Executive summary:

A study was conducted according to OECD TG 104, Regulation (EC) No 440/2008 method A.4 and OPPTS 830.7950 to determine the vapour pressure of the test item. The vapour pressure was measured with the vapour pressure balance in the temperature range of 25 °C to 111.0 °C. The Antoine constants from the regression of the data were used to calculate the vapour pressure for 20, 25 and 50°C to be 1.2E-4 Pa, 2.4E-4 Pa and 5.3E-3 Pa respectively.

Description of key information

The vapour pressure at 20 °C was determined to be 1.2E-4 Pa and at 25 °C to be 2.4E-4 Pa respectively (reference 4.6 -1).

Key value for chemical safety assessment

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

Additional information

A study was conducted according to OECD TG 104, Regulation (EC) No 440/2008 method A.4 and OPPTS 830.7950 to determine the vapour pressure of the test item. The vapour pressure was measured with the vapour pressure balance in the temperature range of 39.5°C to 111.0°C. The Antoine constants from the regression of the data were used to calculate the vapour pressure for 20, 25 and 50°C to be 1.2E-4 Pa, 2.4E-4 Pa and 5.3E-3 Pa respectively.