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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:
26-Aug-2015 to 06-Oct-2015
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reference:
Composition 0
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Qualifier:
according to
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
GLP compliance:
no
Type of method:
dynamic method
Remarks:
Vapour-liquid equilibrium
Test material information:
Composition 1
Key result
Temp.:
20 °C
Vapour pressure:
2.24 hPa
Key result
Temp.:
25 °C
Vapour pressure:
2.78 hPa
Key result
Temp.:
50 °C
Vapour pressure:
7.39 hPa

Results

Dynamic method: Vapour-liquid equilibrium (VLE)

The vapour pressure was measured in the temperature range of 72.9 to 125.0 °C. The measured vapour pressure values together with the measured temperatures are listed in the table.

Results of the dynamic method

No.

Temperature / °C

Vapour pressure / hPa

Remark

1

72.9

16.5

measured up

2

87.5

24.8

measured up

3

101.2

34.9

measured up

4

113.9

49.7

measured up

5

120.8

59.3

measured up

6

125.0

69.8

measured up

7

121.2

62.3

measured down

8

117.1

54.8

measured down

9

94.1

29.8

measured down

 

From the measured data points of the vapour pressure curve, the constants A, B and C of the Antoine equation were calculated:

Antoine equation:

Log10 ρ = A + B / C + θ

A = 7.9403

B = -1638.91

C = 273.15

Final results

The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C, according to Regulation EC 440/2008 Method A.4. Vapour Pressure.

Calculated vapour pressure values for 20, 25 and 50 °C

Temperature / °C

Vapour pressure / hPa

20

2.24

25

2.78

50

7.39

Conclusions:
Vapour pressure values of 2.24 hPa at 20 °C, 2.78 hPa at 25 °C and 7.39 hPa at 50 °C were determined for the test substance according to E.U. Method A.4.

Description of key information

Vapour pressure: 2.24 hPa at 20 °C, 2.78 hPa at 25 °C and 7.39 hPa at 50 °C (EU Method A.4, vapour-liquid equilibrium)

Key value for chemical safety assessment

Vapour pressure:
2.78 hPa
at the temperature of:
25 °C

Additional information