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EC number: 202-945-6 | CAS number: 101-48-4
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:
- 26-Aug-2015 to 06-Oct-2015
- 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:
- dynamic method
- Remarks:
- Vapour-liquid equilibrium
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 2.24 hPa
- Key result
- Temp.:
- 25 °C
- Vapour pressure:
- 2.78 hPa
- Key result
- Temp.:
- 50 °C
- Vapour pressure:
- 7.39 hPa
- Conclusions:
- Vapour pressure values of 2.24 hPa at 20 °C, 2.78 hPa at 25 °C and 7.39 hPa at 50 °C were determined for the test substance according to E.U. Method A.4.
Reference
Results
Dynamic method: Vapour-liquid equilibrium (VLE)
The vapour pressure was measured in the temperature range of 72.9 to 125.0 °C. The measured vapour pressure values together with the measured temperatures are listed in the table.
Results of the dynamic method
No. |
Temperature / °C |
Vapour pressure / hPa |
Remark |
1 |
72.9 |
16.5 |
measured up |
2 |
87.5 |
24.8 |
measured up |
3 |
101.2 |
34.9 |
measured up |
4 |
113.9 |
49.7 |
measured up |
5 |
120.8 |
59.3 |
measured up |
6 |
125.0 |
69.8 |
measured up |
7 |
121.2 |
62.3 |
measured down |
8 |
117.1 |
54.8 |
measured down |
9 |
94.1 |
29.8 |
measured down |
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 ρ = A + B / C + θ
A = 7.9403
B = -1638.91
C = 273.15
Final results
The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C, according to Regulation EC 440/2008 Method A.4. Vapour Pressure.
Calculated vapour pressure values for 20, 25 and 50 °C
Temperature / °C |
Vapour pressure / hPa |
20 |
2.24 |
25 |
2.78 |
50 |
7.39 |
Description of key information
Vapour pressure: 2.24 hPa at 20 °C, 2.78 hPa at 25 °C and 7.39 hPa at 50 °C (EU Method A.4, vapour-liquid equilibrium)
Key value for chemical safety assessment
- Vapour pressure:
- 2.78 hPa
- at the temperature of:
- 25 °C
Additional information
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