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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:
2018-03-20 to 2018-03-28
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
Key result
Temp.:
20 °C
Vapour pressure:
0.003 Pa
Remarks on result:
other: calculated by extrapolation of the measured vapour pressure curve
Key result
Temp.:
25 °C
Vapour pressure:
0.004 Pa
Remarks on result:
other: calculated by extrapolation of the measured vapour pressure curve
Key result
Temp.:
50 °C
Vapour pressure:
0.019 Pa
Remarks on result:
other: calculated by extrapolation of the measured vapour pressure curve

- Thermal Stability:

Three endothermal effects could be detected up to the maximum test temperature of 300 °C. The first endothermic effect is detected in the temperature range of 40 – 50 °C, the second in the temperature range of 110 – 130 °C and the third in the temperature range of 140 – 170 °C (decomposition).

- Effusion method: Knudsen cell:

Results of the Effusion method using the Knudsen cell method

No.

Temperature / °C

Vapour pressure / Pa

1

71

6.52 E-2

2

76

8.89 E-2

3

81

1.10 E-1

4

86

1.48 E-1

5

91

1.85 E-1

6

96

2.39 E-1

 

The Antoine equation was used to extrapolate the results to 20, 25 and 50°C:

A = 7.0208

B = -2821.18

C = 273.15

Conclusions:
The vapour pressure of the test item was calculated to be 2.50E-03, 3.62E-03, 1.95E-02 Pa at 20, 25 and 50 °C, respectively.
Executive summary:

The vapour pressure of the test item was determined according to OECD 104 using Effusion method: Knudsen cell. Measurements were performed at 71,76, 81,86, 91 and 96°C.

The vapour pressure was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C, using the Antoine equation. The calculated vapour pressures are 2.50E-03, 3.62E-03, 1.95E-02 Pa at 20, 25 and 50 °C, respectively.

Description of key information

The vapour pressure of the test item was determined according to OECD 104 using Effusion method: Knudsen cell. The vapour pressure was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C which were 2.50E-03, 3.62E-03, 1.95E-02 Pa at 20, 25 and 50 °C, respectively.

Key value for chemical safety assessment

Vapour pressure:
0.003 Pa
at the temperature of:
20 °C

Additional information