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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
06 Jul - 06 Sep 2017
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)
Version / remarks:
2006
Qualifier:
according to
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Version / remarks:
1996
GLP compliance:
not specified
Type of method:
effusion method: vapour pressure balance
Key result
Temp.:
20 °C
Vapour pressure:
< 0.001 Pa
Temp.:
25 °C
Vapour pressure:
< 0.001 Pa
Temp.:
50 °C
Vapour pressure:
< 0.001 Pa
Transition / decomposition:
yes
Transition temp.:
>= 190 °C

Thermal Stability

In the temperature range of 110 °C - 170 °C, an endothermic effect was observed. An exothermic effect was detected in the temperature range of 190 - 260 °C, with a decomposition energy of -160 J/g. The exothermic effect was directly followed by a second endothermic effect in the temperature range of 260 - 270 °C. The test was terminated at 300 °C. The results are summarized in the following table.

 

Sample weight / mg

Start / °C

Energy / J/g

7.25

110 (endothermic)

190 (exothermic)

260 (endothermic)

+60

-160

+20

 

 

Effusion method: Knudsen cell

The vapour pressure was measured in the temperature range of 81 to 111 °C. The measured vapour pressure values together with the measured temperatures are listed in the following table.

 

No.

Temperature / °C

Vapour pressure / Pa

1

80.8

1.26x10-3

2

91.0

6.14x10-4

3

101.0

7.48x10-4

4

111.0

6.59x10-4

 

Since no evaluable vapour pressure curve could be determined using the Knudsen cell method a further measurement was carried out using the vapour pressure balance.

 

 

Effusion method: Vapour pressure balance

The measurement was performed in the temperature range of 28 to 168 °C. The measured vapour pressure values together with the measured temperatures are listed in the following table.

 

No.

Temperature / °C

Vapour pressure / Pa

1

28

5.19x10-4

2

38

5.26x10-4

3

58

5.98x10-4

4

78

7.75x10-4

5

98

1.02x10-3

6

108

9.09x10-4

7

118

8.75x10-4

8

138

1.39x10-3

9

143

1.27x10-3

10

148

1.36x10-3

11

153

1.85x10-3

12

158

2.75x10-3

13

163

8.27x10-3

14

168

1.97x10-2

 

In the investigated temperature range from 28 to 168 °C no evaluable vapour pressure curve could be detected. Due to fact that the test item starts to decompose at a temperature of approx. 190 °C, the measurement was aborted.

 

Final Results

The test item showed no evaluable vapour pressure curve in the temperature range of 28 to 168 °C. Due to this result, the Antoine constant cannot be evaluated and the vapour pressure for the temperatures 20, 25 and 50 °C is estimated on the basis of the measured vapour pressures in the temperature range of 28 - 58 °C, according to Regulation EC No. 440/2008 Method A.4. Vapour Pressure and OECD Test Guideline 104 (2006).

 

Temperature / °C

Vapour pressure / Pa

20

<10-3

25

<10-3

50

<10-3

Description of key information

Vapour pressure: < 0.001 Pa at 20 °C, 25 °C and 50 °C (OECD Guideline 104, effusion method: vapour pressure balance)

Key value for chemical safety assessment

Additional information

The test item showed no evaluable vapour pressure curve in the temperature range of 28 to 168 °C. Due to this result, the Antoine constant cannot be evaluated and the vapour pressure for the temperatures 20, 25 and 50 °C is estimated on the basis of the measured vapour pressures in the temperature range of 28 - 58 °C (5.19E-4 - 5.98E-4 Pa), according to Regulation EC No. 440/2008 Method A.4. Vapour Pressure and OECD Test Guideline 104 (2006).