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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:
28-Jan-2016 to 17-Feb-2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reference:
Composition 1
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:
2.48 hPa
Key result
Temp.:
25 °C
Vapour pressure:
3.38 hPa
Key result
Temp.:
50 °C
Vapour pressure:
13.89 hPa

Results

Dynamic method: Vapour-liquid equilibrium (VLE)

The vapour pressure was measured in the temperature range of 39.1 to 87.8 °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

39.1

7.2

Measured up

2

61.6

23.9

Measured up

3

67.0

34.8

Measured up

4

76.9

49.8

Measured up

5

83.5

64.8

Measured up

6

87.8

74.6

Measured up

7

81.1

59.1

Measured down

8

72.7

44.9

Measured down

9

67.8

38.2

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 = 10.4543

B = -2362 -79

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

2.48

25

3.38

50

13.89

   

Conclusions:
Vapour pressure values of 2.48 hPa (at 20 °C), 3.38 hPa (at 25 °C) and 13.89 hPa (at 50 °C) were determined for the test substance according to E.U. Method A.4.

Description of key information

Vapour pressure: 2.48 hPa at 20 °C (EU Method A.4., dynamic method: vapour-liquid equilibrium)

Key value for chemical safety assessment

Vapour pressure:
2.48 hPa
at the temperature of:
20 °C

Additional information

Vapour pressure values of 2.48 hPa (at 20 °C), 3.38 hPa (at 25 °C) and 13.89 hPa (at 50 °C) were determined for the test substance according to E.U. Method A.4.