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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
21 to 26 April 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
Temp.:
20 °C
Vapour pressure:
0.64 hPa
Key result
Temp.:
25 °C
Vapour pressure:
0.87 hPa
Temp.:
50 °C
Vapour pressure:
3.49 hPa

Results

 

Thermal Stability

The test item showed a small exothermic effect in the temperature range of 260 - 300 °C with an energy of -10 J/g.

 

Results of the DSC-measurements on thermal stability

No.

Sample weight / mg

Start of effect / °C

Energy / J/g

PN10927

10.97

260

-10

 

 

Dynamic method: Vapour-liquid equilibrium (VLE)

The vapour pressure was measured in the temperature range of 66.0 to 143.4 °C. The measured vapour pressure values together with the measured temperatures are listed in the table below.

 

Results of the dynamic method

No.

Temperature / °C

Vapour pressure / hPa

Remark

1

66.0

7.9

measured up

2

114.3

51.4

measured up

3

123.3

74.8

measured up

4

131.3

99.9

measured up

5

137.8

124.5

measured up

6

143.4

149.6

measured up

7

139.7

131.7

measured down

8

135.4

114.2

measured down

9

102.2

34.9

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 = 9.7718

B = -2335.89

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.

 

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

Temperature / °C

Vapour pressure / hPa

20

0.64

25

0.87

50

3.49

 

Conclusions:
Vapour pressure values of 0.64 hPa (at 20 °C), 0.87 hPa (at 25 °C) and 3.49 hPa (at 50 °C) were determined for the test substance according to E.U. Method A.4.

Description of key information

Vapour pressure: 0.64 hPa at 20 °C, 0.87 hPa at 25 °C, and 3.49 hPa at 50 °C (E.U. Method A.4, dynamic method)

Key value for chemical safety assessment

Vapour pressure:
0.87 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.