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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-Jul-2015 to 10-Aug-2015
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
GLP compliance:
no
Type of method:
dynamic method
Remarks:
Vapour-liquid equilibrium
Key result
Temp.:
20 °C
Vapour pressure:
2.8 hPa
Key result
Temp.:
25 °C
Vapour pressure:
3.5 hPa
Key result
Temp.:
50 °C
Vapour pressure:
10.9 hPa

Results

Dynamic method: Vapour-liquid equilibrium (VLE)

The vapour pressure was measured in the temperature range of 56.6 to 156.6 °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

56.6

17.8

Measured up

2

77.8

29.8

Measured up

3

100.6

58.4

Measured up

4

122.9

117.4

Measured up

5

144.7

243.8

Measured up

6

156.6

349.2

Measured up

7

150.1

289.1

Measured down

8

115.1

96.3

Measured down

9

93.3

49.1

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 = 8.8880

B = -1890.32

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

2.8

25

3.5

50

10.9

   

Conclusions:
Vapour pressure values of 2.8 hPa (at 20 °C), 3.5 hPa (at 25 °C) and 10.9 hPa (at 50 °C) were determined for the test substance according to E.U. Method A.4.

Description of key information

Vapour pressure: 2.8 hPa at 20 °C, 3.5 hPa at 25 °C, 10.9 hPa at 50 °C (EU Method A.4., dynamic method: vapour-liquid equilibrium)

Key value for chemical safety assessment

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

Additional information

According to Regulation EC No. 440/2008 Method A.4, the vapour pressure values of the test item for the temperatures 20, 25 and 50 °C were calculated by extrapolation of the measured vapour pressure curve.