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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:
24-Nov-2014
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reference:
Composition 1
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
Test material information:
Composition 1
Key result
Temp.:
20 °C
Vapour pressure:
0.16 hPa
Key result
Temp.:
25 °C
Vapour pressure:
0.21 hPa
Key result
Temp.:
50 °C
Vapour pressure:
0.8 hPa

Dynamic method: Vapour-liquid equilibrium (VLE)

The vapour pressure was measured in the temperature range of 114.0 to 167.8 °C. The measured vapour pressure values together with the measured temperatures are given Table 1.

 

Table 1: Results of the dynamic method

No.

Temperature / °C

Vapour pressure / hPa

Remark

1

114.0

11.7

Measured up

2

133.9

19.7

Measured up

3

147.2

29.9

Measured up

4

155.6

39.9

Measured up

5

161.3

49.8

Measured up

6

167.8

59.5

Measured up

7

161.6

49.6

Measured down

8

146.8

29.9

Measured down

9

121.1

14.9

Measured down

 

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

 

Log10 ρ = A +  B / C + θ

 

Can be derived by regression (Microsoft excel) of the data points

 

A = 8.8311

B = -2239.00

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.

 

Table 2: Calculated vapour pressure values for 20, 25 and 50 °C

           

Temperature / °C

Vapour pressure / hPa

20

0.16

25

0.21

50

0.80

     

Conclusions:
Vapour pressure values of 0.16 hPa (at 20 °C), 0.21 hPa (at 25 °C) and 0.8 hPa (at 50 °C) were determined for the test substance according to EU Method A.4.

Description of key information

Vapour pressure: 0.21 hPa at 25 °C (EU Method A.4, dynamic method)

Key value for chemical safety assessment

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

Additional information

Vapour pressure values of 0.16 hPa (at 20 °C), 0.21 hPa (at 25 °C) and 0.8 hPa (at 50 °C) were determined for the test substance according to EU Method A.4.