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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:
10.02.2004 - 02.04.2004
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: vapour pressure balance
Temp.:
20 °C
Vapour pressure:
0 Pa
Key result
Temp.:
25 °C
Vapour pressure:
0 Pa
Temp.:
50 °C
Vapour pressure:
0 Pa

Vapour Pressure Balance (Effusion Method)

The vapour pressure was measured in the temperature range of 32 °C to 130 °C Above 75 °C a vapour pressure could be measured.

Temperature / °C

Vapour pressure / hPa

75.0

1.9E-5

75.3

1.9E-5

81.2

5.8E-5

81.4

6.5E-6

84.9

8.5E-5

85.1

9.8E-5

90.0

1.8E-4

94.2

2.7E-4

99.3

4.9E-4

99.7

4.9E-4

105.5

8.0E-4

108.6

1.1E-3

115.0

2.0E-3

122.1

4.0E-3

130.1

8.8E-3

The vapour pressure at 20, 25 and 50 °C are calculated, using the Antoine constants A, B and C.

Temperature / °C

Vapour pressure / hPa

Vapour pressure / Pa

log (p/hPa) = A + B / (C + T [°C])

20

7.26E-9

7.26E-7

A = 14.26417

25

1.73E-8

1.73E-6

B = -6567.44

50

8.73E-7

8.73E-5

C = 273.15

 

Conclusions:
The vapour pressure of the test item was determined to be 7.3E-7 Pa at 20 °C, 1.7E-6 Pa at 25 °C and 8.7E-5 Pa at 50 °C, respectively.
Executive summary:

A study was conducted according to OECD TG 104 and Guideline 67/548/EEC Annex V method A.4 to determine the vapour pressure of the test item. The vapour pressure was measured in the temperature range of 32 °C to 130 °C using the effusion method. Above 75 °C a vapour pressure could be measured. The vapour pressure was calculated using the linear regression equation of the Log P versus 1/T function. The vapour pressure of the test item was determined to be 7.3E-7 Pa at 20 °C, 1.7E-6 Pa at 25 °C and 8.7E-5 Pa at 50 °C, respectively.

Description of key information

The vapour pressure of the test item was determined to be 7.3E-7 Pa at 20 °C, 1.7E-6 Pa at 25 °C and 8.7E-5 Pa at 50 °C, respectively.

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 and Guideline 67/548/EEC Annex V method A.4 to determine the vapour pressure of the test item. The vapour pressure was measured in the temperature range of 32 °C to 130 °C using the effusion method. Above 75 °C a vapour pressure could be measured. The vapour pressure was calculated using the linear regression equation of the Log P versus 1/T function. The vapour pressure of the test item was determined to be 7.3E-7 Pa at 20 °C, 1.7E-6 Pa at 25 °C and 8.7E-5 Pa at 50 °C, respectively (reference 4.6-1).