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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:
2000-06-14 to 21
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
no
Type of method:
dynamic method
Key result
Test no.:
#1
Temp.:
25 °C
Vapour pressure:
1.7 hPa
Test no.:
#2
Temp.:
50 °C
Vapour pressure:
7.4 hPa

Dynamic method 

The vapour pressure was measured in the temperature range of 77.5 °C to 185 °C.

 

Temperature [°C]

vapour pressure [hPa]

94.5

60.8

108.6

100.6

128.0

181.2

143.1

299.5

164.1

541.4

184.9

960.2

175.1

747.0

154.0

411.3

136.0

238.6

119.3

140.9

100.1

80.0

77.5

25.1

 

The values for 25 and 50 °C and for 1013 hPa are calculated, using the Antoine constants A, B and C as shown. The vapour pressure value for 25 °C was extrapolated to be 1.7 hPa. The vapour pressure value for 50 °C was extrapolated to be 7.4 hPa.

Conclusions:
The vapour pressure for 25 °C was determined to be 1.7 hPa.
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 using the dynamic method. A vapour pressure curve with 12 data points was measured over a pressure range between 77.5 to 185°C. From the measured data points of the vapour pressure curve the constants A, B and C of the Antoine equation was derived and the vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 25 and 50°C. The vapour pressure was determined to be1.7 hPa at 25°C, 7.4 hPa at 25°C respectively.

Description of key information

The vapour pressure at 25 °C was determined to be 1.7 hPa (reference 4.6 -1).

Key value for chemical safety assessment

Vapour pressure:
1.7 hPa
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 using the dynamic method (reference 4.6 -1). A vapour pressure curve with 12 data points was measured over a pressure range between 77.5 to 185°C. From the measured data points of the vapour pressure curve the constants A, B and C of the Antoine equation was derived and the vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 25 and 50°C. The vapour pressure was determined to be1.7 hPa at 25°C, 7.4 hPa at 25°C respectively.