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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:
21 to 27 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:
0.14 hPa
Key result
Temp.:
25 °C
Vapour pressure:
0.2 hPa
Temp.:
50 °C
Vapour pressure:
1.05 hPa
Transition / decomposition:
no

Thermal Stability

The test item showed no thermal effects in the temperature range of 25 - 300 °C.

 

Dynamic method: Vapour-liquid equilibrium (VLE)

The vapour pressure was measured in the temperature range of 83.8 to 161.5 °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

83.8

6.4

measured up

2

122.5

35.1

measured up

3

135.1

59.6

measured up

4

142.5

79.5

measured up

5

149.8

104.1

measured up

6

161.5

149.2

measured up

7

155.3

124.5

measured down

8

144.9

89.7

measured down

9

121.1

40.1

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 = 10.4799

B = -2733.79

C = 273.15.

 

 

Final Results

The vapour pressure of the test item was calculated by interpolation and 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

0.14

25

0.20

50

1.05

Conclusions:
Vapour pressure values of 0.14 hPa (at 20 °C), 0.20 hPa (at 25 °C) and 1.05 hPa (at 50 °C) were determined for the test substance according to E.U. Method A.4.

Description of key information

Vapour pressure: 0.14 hPa at 20 °C, 0.20 hPa at 25 °C, 1.05 hPa at 50 °C (EU Method A.4, dynamic method)

Key value for chemical safety assessment

Vapour pressure:
0.2 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.