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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-Oct-2014
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
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
Key result
Temp.:
20 °C
Vapour pressure:
0.06 hPa
Key result
Temp.:
25 °C
Vapour pressure:
0.08 hPa
Key result
Temp.:
50 °C
Vapour pressure:
0.4 hPa

Results

Dynamic method: Vapour-liquid equilibrium (VLE)

The vapour pressure was measured in the temperature range of 134.1 to 218.1 °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

134.1

20

Measured up

2

157.3

40

Measured up

3

179.7

80

Measured up

4

202.1

160

Measured up

5

218.1

250

Measured up

6

209.8

200

Measured down

7

185.6

100

Measured down

8

164.1

50

Measured down

9

140.5

25

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 = 9.7217

B = -2623.77

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

0.06

25

0.08

50

0.40

     

 

Conclusions:
Vapour pressure values of 0.06 hPa (at 20 °C), 0.08 hPa (at 25 °C) and 0.4 hPa (at 50 °C) were determined for the test substance according to E.U. Method A.4.

Description of key information

Vapour pressure: 0.08 hPa at 25 °C (EU Method A.4, dynamic method: vapour-liquid equilibrium)

Key value for chemical safety assessment

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

Additional information

Vapour pressure values of 0.06 hPa (at 20 °C), 0.08 hPa (at 25 °C) and 0.4 hPa (at 50 °C) were determined for the test substance according to E.U. Method A.4.