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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:
2013-07-01
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: Knudsen cell
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0 Pa
Key result
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0 Pa
Key result
Test no.:
#3
Temp.:
125 °C
Vapour pressure:
0 Pa

The vapour pressure was measured twice. The first measurement was performed in the temperature range of 115 °C to 140 °C.

  

Temperature / °C

Vapour pressure / hPa

115

2.2E-5

120

3.2E-5

125

3.8E-5

130

9.9E-5

135

1.5E-4

140

2.7E-4

 

 

Antoine parameters and extrapolated vapour pressures 

T / ° C

p / hPa

log (p/hPa) = A + B/(C+T[°C])

20

1.7E-11

A = 13.83698

25

4.54E-11

B = -7209.22

50

3.37E-9

C = 273.15

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

 

  

Conclusions:
The vapour pressure at 20, 25 and 50 °C was determined to be 1.76E-9, 4.54E-9 and 3.37E-7 Pa, respectively.
Executive summary:

A study was conducted according to OECD TG 104 and 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 (115 - 140 °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 at 20, 25 and 50 °C was determined to be 1.76E-9, 4.54E-9 and 3.37E-7 Pa, respectively.

Description of key information

The vapour pressure at 20, 25 and 50 °C was determined to be 1.76E-9, 4.54E-9 and 3.37E-7 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 OECD TG 104 and 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 (115 - 140 °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 at 20, 25 and 50 °C was determined to be 1.76E-9, 4.54E-9 and 3.37E-7 Pa, respectively.