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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:
24-10-2014 to 09-12-2014
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:
no
Type of method:
dynamic method
Temp.:
20 °C
Vapour pressure:
0.24 Pa
Key result
Temp.:
25 °C
Vapour pressure:
0.53 Pa
Temp.:
50 °C
Vapour pressure:
13.1 Pa

Vapour pressure (dynamic method)

The vapour pressure was measured with the dynamic method in the temperature range of 104 °C to 219 °C.

Table 1: Measured vapour pressure

Temperature / °C

Vapour pressure / hPa

104.7

10

124.5

30

139.8

60

152.5

100

171.5

200

193.3

400

206.8

600

219.3

800

183.8

300

163.1

150

133.5

45

116.6

20

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

Table 2: Antoine parameters and extrapolated vapour pressures

T/°C

log (p/hPa) = A + B/(C + T[°C])

p/hPa

p/Pa

20

A = 6.3993

2.40E-3

0.24

25

B = -1135.8

5.31E-3

0.53

50

C = 273.15

1.31E-1

13.1
Conclusions:
The vapoure pressure of the test item was determined to be 0.24 Pa at 20 °C, 0.53 Pa at 25 °C and 13.1 Pa at 50 °C, 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 using the dynamic method. With the dynamic method the vapour pressure was measured by determining the boiling point of the test item at various specified pressures between approx. 10 and 800 hPa. A steady temperature under constant pressure indicates that the boiling point has been reached. The vapour pressure was measured with the dynamic method in the temperature range of 104 °C to 219 °C. The vapour pressure was calculated to be 0.24 Pa at 20 °C, 0.53 Pa at 25 °C and 13.1 Pa at 50 °C, respectively.

Description of key information

The vapoure pressure of the test item was determined to be 0.24 Pa at 20 °C, 0.53 Pa at 25 °C and 13.1 Pa at 50 °C, respectively.

Key value for chemical safety assessment

Vapour pressure:
0.53 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 using the dynamic method. With the dynamic method the vapour pressure was measured by determining the boiling point of the test item at various specified pressures between approx. 10 and 800 hPa. A steady temperature under constant pressure indicates that the boiling point has been reached. The vapour pressure was measured with the dynamic method in the temperature range of 104 °C to 219 °C. The vapour pressure was calculated to be 0.24 Pa at 20 °C, 0.53 Pa at 25 °C and 13.1 Pa at 50 °C, respectively (reference 4.6-1).