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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:
2018-06-27 to 2018-10-08
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
2008
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
effusion method: Knudsen cell
Remarks:
effusion method: vapour pressure balance
Key result
Temp.:
20 °C
Vapour pressure:
< 0.006 Pa
Remarks on result:
other: No vapour pressure measureable, estimation on the basis of maximum measured vapour pressures
Key result
Temp.:
25 °C
Vapour pressure:
< 0.006 Pa
Remarks on result:
other: No vapour pressure measureable, estimation on the basis of maximum measured vapour pressures
Key result
Temp.:
50 °C
Vapour pressure:
< 0.006 Pa
Remarks on result:
other: No vapour pressure measureable, estimation on the basis of maximum measured vapour pressures
Key result
Vapour pressure:
< 0.006 Pa

Effusion method:Knudsen cell

No evaluable mass loss could be recorded in the temperature of 133 – 151 °C. Due to this result, further measurements were carried using the vapour pressure balance.

Effusion method: Vapour pressure balance

In the first measurement a vapour pressure could be measured in the temperature range from 73 to 138 °C and in the second measurement from 62 to 78 °C. The measured vapour pressure values together with the measured temperatures are listed inTable1.

Table1:    Results of the Effusion method: Vapour pressure balance

No.

Temperature / °C

Vapour pressure / Pa

1-1

73

2.14 E-03

1-2

78

2.93 E-03

1-3

83

3.50 E-03

1-4

87

3.30 E-03

1-5

97

4.17 E-03

1-6

107

6.38 E-03

1-7

112

5.41 E-03

1-8

118

3.82 E-03

1-9

128

3.44 E-03

1-10

138

1.19 E-03

2-1

62

2.69 E-03

2-2

64

5.43 E-04

2-3

66

9.58 E-04

2-4

68

1.07 E-03

2-5

70

1.09 × 10-3

2-6

72

1.10 E-03

2-7

74

1.01 E-03

2-8

76

9.37 E-04

2-9

78

8.17 E-04

Conclusions:
The test item TA-1 showed no evaluable vapour pressure curve in the temperature range of 62 to 151 °C. Due to this result, the vapour pressures for the temperatures 20, 25 and 50 °C are estimated on the basis of the maximum measured vapour pressures, according to Regulation EC No. 440/2008 Method A.4. Vapour Pressure and OECD Test Guideline 104 (2006). At all temperatures the vapour pressure was estimated to be < 6.4E-03 Pa.

Description of key information

The test item TA-1 showed no evaluable vapour pressure curve in the temperature range of 62 to 151 °C. Due to this result, the vapour pressures for the temperatures 20, 25 and 50 °C are estimated on the basis of the maximum measured vapour pressures, according to Regulation EC No. 440/2008 Method A.4. Vapour Pressure and OECD Test Guideline 104 (2006). At all temperatures the vapour pressure was estimated to be < 6.4E-03 Pa.

Key value for chemical safety assessment

Additional information