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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 22-Sep-2015
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
GLP compliance:
no
Type of method:
dynamic method
Remarks:
Vapour-liquid equilibrium
Key result
Temp.:
20 °C
Vapour pressure:
0.6 hPa
Key result
Temp.:
25 °C
Vapour pressure:
0.76 hPa
Key result
Temp.:
50 °C
Vapour pressure:
2.23 hPa

Results

Dynamic method: Vapour-liquid equilibrium (VLE)

The vapour pressure was measured in the temperature range of 115.1 to 161.5 °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

115.1

19.8

Measured up

2

133.2

30.1

Measured up

3

144.7

39.8

Measured up

4

150.9

47.3

Measured up

5

156.7

54.2

Measured up

6

161.5

62.3

Measured up

7

158.7

56.5

Measured down

8

155.8

52.4

Measured down

9

138.9

34.8

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 = 7.9237

B = -1801.96

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 and OECD Test Guideline 104 (2006).

 

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

Temperature / °C

Vapour pressure / hPa

20

0.60

25

0.76

50

2.23

   

Conclusions:
Vapour pressure values of 0.60 hPa (at 20 °C), 0.76 hPa (at 25 °C) and 2.23 hPa (at 50 °C) were determined for the test substance according to E.U. Method A.4.

Description of key information

Vapour pressure: 0.60 hPa at 20 °C, 0.76 hPa at 25 °C and 2.23 hPa at 50 °C (EU Method A.4, vapour-liquid equilibrium)

Key value for chemical safety assessment

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

Additional information