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Physical & Chemical properties

Vapour pressure

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Administrative data

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
04 November to 05 November 1998
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
yes
Type of method:
effusion method: vapour pressure balance
Temp.:
25 °C
Vapour pressure:
0 hPa
Remarks on result:
other: Calculated by extrapolation from higher temperature results.

DSC Vapour Pressure results

Temperature [°C]

Vapour pressure [hPa]

80.6

1.0 x 10-5

85.0

2.6 x 10-5

85.6

1.6 x 10-5

89.1

5.7 x 10-5

93.9

8.9 x 10-5

99.6

1.3 x 10-4

104.4

1.9 x 10-4

113.1

4.0 x 10-4

114.6

5.2 x 10-4

120.8

6.7 x 10-4

125.3

9.1 x 10-4

126.0

8.7 x 10-4

129.7

9.9 x 10-4

136.8

1.1 x 10-3

137.5

1.1 x 10-3

142.1

1.2 x 10-3

148.4

1.4 x 10-3

150.3

1.5 x 10-3

152.0

1.7 x 10-3

 

Conclusions:
The vapour pressure value for 25 °C is 1.10-7 hPa.
Executive summary:

The purpose of the test was the determination of the vapour pressure according to Guideline 92/69/EEC of 31 July 1992, Annex. Part A: Methods for the determination of physico-chemical properties. A.4.Vapour pressure. The study was conducted in compliance with the Principles of Good Laboratory Practice (GLP).

 

A Differential Scanning Calorimetry of the test substance was performed (see project SI074-98 - melting point). The measurement in a closed glass pan shows an endothermal effect (melting) and an exothermal effect beginning at 180 °C.

 

The vapour pressure was first measured at a temperature of 22.5 °C. At 80.6 °C the vapour pressure of the test substance was above the lower measuring limit.

 

The DSC measuring (SI074-98) shows the beginning of the melting process at about 130 °C, so the vapor pressure values at temperatures higher should be excluded. The first three values at the lower end of the recommended range are inconsistent, so this values should also be excluded. Therefore for calculating result the values in the temperature range 89.1 -129.7 °C are taken.

 

The vapour pressure value for 25 °C is 1.10-7 hPa.

Description of key information

The vapour pressure value for 25 °C is 1.10-7 hPa.

Key value for chemical safety assessment

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

Additional information

The purpose of the test was the determination of the vapour pressure according to Guideline 92/69/EEC of 31 July 1992, Annex. Part A: Methods for the determination of physico-chemical properties. A.4.Vapour pressure. The study was conducted in compliance with the Principles of Good Laboratory Practice (GLP).A Differential Scanning Calorimetry of the test substance was performed (see project SI074-98 - melting point). The measurement in a closed glass pan shows an endothermal effect (melting) and an exothermal effect beginning at 180 °C. The vapour pressure was first measured at a temperature of 22.5 °C. At 80.6 °C the vapour pressure of the test substance was above the lower measuring limit. The DSC measuring (SI074-98) shows the beginning of the melting process at about 130 °C, so the vapor pressure values at temperatures higher should be excluded. The first three values at the lower end of the recommended range are inconsistent, so this values should also be excluded. Therefore for calculating result the values in the temperature range 89.1 -129.7 °C are taken.