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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 April 2007 to 23 August 2007
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose for cross-reference:
reference to same study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: vapour pressure balance
Temp.:
20 °C
Vapour pressure:
0 Pa
Remarks on result:
other: 2.0 X 10-12 Pa
Temp.:
25 °C
Vapour pressure:
0 Pa
Remarks on result:
other: 8.9 X 10-12 Pa
Temp.:
50 °C
Vapour pressure:
0 Pa
Remarks on result:
other: 7.0 X 10-09 Pa

The vapour pressure was measured in the temperature range of 30°C to 146°C. Above 105°C a vapour pressure could be measured. The measured vapour pressures at the corresponding temperatures are listed in the following table:

 

No.

Temperature /°C

Vapour pressure / hPa

1

105.3

7.3 x 10-6

2

111.0

2.0 x 10-5

3

112.9

2.6 x 10-5

4

116.1

6.0 x 10-5

5

121.4

1.1 x 10-4

6

126.3

1.6 x 10-4

7

131.8

1.8 x 10-4

8

135.2

2.4 x 10-4

9

141.5

2.4 x 10-4

10

145.5

1.4 x 10-4
Conclusions:
The calculated vapour pressure values are extrapolated: 8.9 x 10-14 hPa at 25°C
Executive summary:

The purpose of this study was the determination of the vapour pressure of the test item according to the consolidated version of Council Directive 67/548/EEC Annex V (Council Directive 92/69/EEC), Part A: Methods for the determination of physico-chemical properties, A.4. Vapour pressure: Vapour pressure balance and OECD test guidelines, OECD 104 (2006) Vapour pressure. The study was performed in accordance with the Principles of Good Laboratory Practice (GLP) and reported with a valid GLP certificate.

 

The measurement was performed with the purified test item. The test item was degassed under vacuum at approximately 10-5hPa at 80 ± 5 °C for 34 hours before the measurement.

The apparatus consists of a high vacuum chamber. The test item is filled into a furnace in the chamber from which the sample evaporates. The temperature of the cell with the test item is controlled by a surrounding heater. The vapour forms a molecular jet of defined geometry limited by an orifice. The molecular jet can be interrupted by a shutter between the orifice of the cell and the plate of the balance. The vapour jet is condensed on a plate cooled down below - 100 °C by a surrounding copper baffle which is in contact with liquid nitrogen. The plate forms one end of an ultra micro balance. Using the shutter between the orifice and the balance, the increase of mass during an elapsed time period is recorded.

The vacuum in the chamber is maintained by a turbo-molecular pump in combination with a rotary pump down to a back pressure of < 10-5hPa. The residual pressure is low enough to avoid condensation of gaseous impurities on the plate of the balance. In addition the cooled copper baffle condenses all molecules with low vapour pressure.

 

The calculated vapour pressure values are extrapolated:

 

T in°C

p in hPa

p in Pa

20

2.0 x 10-14

2.0 x 10-12

25

8.9 x 10-14

8.9 x 10-12

50

7.0 x 10-11

7.0 x 10-09

 

Description of key information

The vapour pressure is extrapolated to 8.87 E-14 hPa at 25°C

Key value for chemical safety assessment

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

Additional information

The vapour pressure of the test item was determined according to methods A.4. Vapour pressure: Vapour pressure balance and OECD test guidelines, OECD 104 (2006) Vapour pressure. The measurement was performed with the purified test item. The test item was degassed under vacuum at approximately 10-5hPa at 80±5 °C for 34 hours before the measurement.

The apparatus consists of a high vacuum chamber. The test item is filled into a furnace in the chamber from which the sample evaporates. The temperature of the cell with the test item is controlled by a surrounding heater. The vapour forms a molecular jet of defined geometry limited by an orifice. The molecular jet can be interrupted by a shutter between the orifice of the cell and the plate of the balance. The vapour jet is condensed on a plate cooled down below - 100 °C by a surrounding copper baffle which is in contact with liquid nitrogen. The plate forms one end of an ultra micro balance. Using the shutter between the orifice and the balance, the increase of mass during an elapsed time period is recorded.

The vacuum in the chamber is maintained by a turbo-molecular pump in combination with a rotary pump down to a back pressure of < 10-5hPa. The residual pressure is low enough to avoid condensation of gaseous impurities on the plate of the balance. In addition the cooled copper baffle condenses all molecules with low vapour pressure.

 

The calculated vapour pressure values are extrapolated:

 

T in°C

p in hPa

p in Pa

20

2.0 x 10-14

2.0 x 10-12

25

8.9 x 10-14

8.9 x 10-12

50

7.0 x 10-11

7.0 x 10-09