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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:
25 to 29 July 2016
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
Key result
Temp.:
20 °C
Vapour pressure:
0.08 hPa
Key result
Temp.:
25 °C
Vapour pressure:
0.11 hPa
Key result
Temp.:
50 °C
Vapour pressure:
0.47 hPa

Thermal Stability

The test item showed a beginning of an exothermic effect at a temperature of 250 °C with an energy of > -60 J/g. The measurement was terminated at 300 °C.

 

Results of the DSC-measurements on thermal stability

Sample weight / mg

Start of effect / °C

Energy / J/g

9.38

250

>-60

 

Dynamic method: Vapour-liquid equilibrium (VLE)

The vapour pressure was measured in the temperature range of 124.9 to 186.6 °C. The measured vapour pressure values together with the measured temperatures are listed in the following table.

 

Results of the dynamic method

No.

Temperature / °C

Vapour pressure / hPa

Remark

1

124.9

11.8

measured up

2

149.0

24.6

measured up

3

161.2

34.6

measured up

4

174.7

49.9

measured up

5

179.5

59.5

measured up

6

186.6

74.7

measured up

7

183.3

67.1

measured down

8

175.9

54.7

measured down

9

156.9

29.5

measured down

 

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

 

Log10 p = A + B / ( C + θ )

 

A = 9.0189

B = -2374.84

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 No. 440/2008 Method A.4.

Temperature / °C

Vapour pressure / hPa

20

0.08

25

0.11

50

 0.47

Conclusions:
Vapour pressure values of 0.08 hPa (at 20 °C), 0.11 hPa (at 25 °C) and 0.47 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 20 °C, 0.11 hPa at 25 °C, and 0.47 hPa at 50 °C (EU Method A.4, dynamic method)

Key value for chemical safety assessment

Vapour pressure:
0.11 hPa
at the temperature of:
25 °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.