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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:
19.-21.05.2015
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
no
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:
0.002 Pa

The vapour pressure was measured twice. The measurement was performed in the temperature range of 40 °C to 80 °C.

  

Temperature / °C

Vapour pressure / hPa

40

8.3E-6

50

1.9E-5

60

8.5E-5

70

3.5E-4

80

1.3E-3

 

 

Antoine parameters and extrapolated vapour pressures 

T / ° C

p / hPa

log (p/hPa) = A + B/(C+T[°C])

20

1.1E-5

A = 14.44513

25

2.8E-5

B = -5831.25

50

1.9E-3

C = 273.15

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

 

  

T/°C

p/hPa

p/ Pa

20

1.1E-7

1.1E-5

25

2.8E-7

2.8E-5

50

1.9E-5

1.9E-3

Conclusions:
The vapour pressure at 20, 25 and 50 °C was determined to be 1.1E-5, 2.8E-5 and 1.9E-3 Pa respectively.
Executive summary:

A study was conducted according to Regulation (EC) No 440/2008 method A.4 to determine the vapour pressure of the test item. The vapour pressure of the test item was determined at different temperatures (40 - 80 °C) using the effusion method (weight loss). The vapour pressure was calculated using the linear regression equation of the Log P versus 1/T function. The values for 20, 25 and 50 °C were calculated using the Antoine equation. The vapour pressure was calculated to be 2.8E-5 Pa at 25 °C and 1.1E-5 Pa at 20 °C respectively.

Description of key information

The vapour pressure at 20, 25 and 50 °C was determined to be 1.1E-5, 2.8E-5 and 1.9E-3 Pa 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 Regulation (EC) No 440/2008 method A.4 to determine the vapour pressure of the test item. The vapour pressure of the test item was determined at different temperatures (40 - 80 °C) using the effusion method (weight loss). The vapour pressure was calculated using the linear regression equation of the Log P versus 1/T function. The values for 20, 25 and 50 °C were calculated using the Antoine equation. The vapour pressure was calculated to be 2.8E-5 Pa at 25 °C and 1.1E-5 Pa at 20 °C respectively.