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EC number: 944-329-6 | CAS number: -
Vapour pressure
Administrative data
Link to relevant study record(s)
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 03 Jul - 11 Aug 2017
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7950 (Vapor Pressure)
- GLP compliance:
- no
- Type of method:
- effusion method: Knudsen cell
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 0.027 Pa
- Temp.:
- 25 °C
- Vapour pressure:
- 0.046 Pa
- Temp.:
- 50 °C
- Vapour pressure:
- 0.53 Pa
- Conclusions:
- Vapour pressure values of 0.027 Pa (at 20 °C), 0.046 Pa (at 25 °C) and 0.53 Pa (at 50 °C) were determined for the test substance according to E.U. Method A.4.
Reference
Results
Thermal Stability
The test item in a closed glass crucible showed an exothermic effect in the temperature range of 150 - 200 °C, with a decomposition energy of -20 J/g.
Effusion method: Knudsen cell
The vapour pressure was measured in the temperature range of 41 to 71 °C. The measured vapour pressure values together with the measured temperatures are listed in the following table.
Results of the Effusion method
No. |
Temperature / °C |
Vapour pressure / Pa |
1 |
40.6 |
0.215 |
2 |
45.6 |
0.377 |
3 |
50.7 |
0.571 |
4 |
55.7 |
0.868 |
5 |
60.8 |
1.36 |
6 |
65.8 |
2.06 |
7 |
70.9 |
3.21 |
The measured vapour pressures at 65.8 and 70.9 °C are slightly outside the measuring range (10-3to 1 Pa) of the Knudsen cell. Nevertheless, as the vapour pressure value above 1 Pa could be detected properly by the Knudsen cell, this value can be used for the evaluation.
From the measured data points of the vapour pressure curve, the constants A, B and C of the Antoine equation were calculated:
Antoine equation
Log10 p = A + B / ( C + θ )
A = 12.4278
B = -4104.03
C = 273.15
Final Results
The vapour pressure of the test item was calculated by interpolation and extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °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 |
2.7E-2 |
25 |
4.6E-2 |
50 |
5.3E-1 |
Description of key information
Vapour pressure: 0.027 Pa at 20 °C, 0.046 Pa at 25 °C, and 0.53 Pa at 50 °C (EU Method A.4., effusion method: Knudsen cell)
Key value for chemical safety assessment
- Vapour pressure:
- 0.046 Pa
- at the temperature of:
- 25 °C
Additional information
According to Regulation EC No. 440/2008 Method A.4, the vapour pressure values of the test item for the temperatures 20, 25 and 50 °C were calculated by extrapolation of the measured vapour pressure curve.
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