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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:
16 APR 2013 - 28 MAY 2013
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
European Commission Regulation (EC) No. 440/2008
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: OECD 113 Screening test for thermal stability and stability in air
Version / remarks:
1981
Deviations:
no
GLP compliance:
no
Type of method:
effusion method: Knudsen cell
Temp.:
25 °C
Vapour pressure:
0 hPa

Thermal Stability

The DSC-measurement before testing the vapour pressure with the test item in closed glass crucibles showed an endothermal effect in the temperature range of 260-340 °C. In the temperature range of 340- 450 °C an unsteady baseline occurred.

Vapour pressure balance (Effusion method)

The vapour pressure was measured in the temperature range of 40 °C to 70 °C. The following table shows the measured vapour pressure data at the corresponding temperatures.

Temperature [°C]  Vapour pressure [hPa]
 40  3.7 x 10-5
 45  7.4 x 10-5
 50  1.1 x 10-4

 55

  1.2 x 10-4
 60  1.9 x 10-4
 65  7.4 x 10-5

 70

 1.4 x 10-4

The data of the vapour pressure measurement showed an unusual behaviour. This is maybe related to the thermal behaviour detected in the pre-test. Therefore the regression to determine the coefficient of the Antoine equation A, B, C was done with the data in the temperature range of 40 - 60 °C. This is a conservative estimation of the vapour pressure of the test item.

Figure 2 (attached as background material) gives the vapour pressure (logarithmic scale) as a function of the inverse temperature (1/T, T in Kelvin). Only for better readability the temperature is also reported in a centigrade scale. The values for 20, 25 and 50 °C are calculated, using the Antoine constants A, B and C as shown there.

Conclusions:
The vapour pressure of the test item is calculated by extrapolation:
20 °C: 0.00000075 hPa
25 °C: 0.000012 hPa
50 °C: 0.000093 hPa
Executive summary:

The vapour pressure of the sample was tested according to EU Method A.4 and OECD Guideline 104 in a non-GLP study with the effusion method.

The vapour pressure of the test item is calculated by extrapolation:

20 °C: 0.00000075 hPa

25 °C: 0.000012 hPa

50 °C: 0.000093 hPa

Description of key information

The vapour pressure of the sample was tested according to EU Method A.4 and OECD Guideline 104 in a non-GLP study with the effusion method.

The vapour pressure of the test item is calculated by extrapolation:

20 °C: 0.00000075 hPa

25 °C: 0.000012 hPa

50 °C: 0.000093 hPa

Key value for chemical safety assessment

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

Additional information

The values for 20, 25 and 50 °C are calculated, using the Antoine constants.