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EC number: 224-957-0 | CAS number: 4573-50-6
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:
- 21 to 27 April 2016
- 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
- Temp.:
- 20 °C
- Vapour pressure:
- 0.14 hPa
- Key result
- Temp.:
- 25 °C
- Vapour pressure:
- 0.2 hPa
- Temp.:
- 50 °C
- Vapour pressure:
- 1.05 hPa
- Transition / decomposition:
- no
- Conclusions:
- Vapour pressure values of 0.14 hPa (at 20 °C), 0.20 hPa (at 25 °C) and 1.05 hPa (at 50 °C) were determined for the test substance according to E.U. Method A.4.
Reference
Thermal Stability
The test item showed no thermal effects in the temperature range of 25 - 300 °C.
Dynamic method: Vapour-liquid equilibrium (VLE)
The vapour pressure was measured in the temperature range of 83.8 to 161.5 °C. The measured vapour pressure values together with the measured temperatures are listed in the following table.
Results of the dynamic method
No. |
Temperature / °C |
Vapour pressure / hPa |
Remark |
1 |
83.8 |
6.4 |
measured up |
2 |
122.5 |
35.1 |
measured up |
3 |
135.1 |
59.6 |
measured up |
4 |
142.5 |
79.5 |
measured up |
5 |
149.8 |
104.1 |
measured up |
6 |
161.5 |
149.2 |
measured up |
7 |
155.3 |
124.5 |
measured down |
8 |
144.9 |
89.7 |
measured down |
9 |
121.1 |
40.1 |
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 = 10.4799
B = -2733.79
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.
Calculated vapour pressure values for 20, 25 and 50 °C
Temperature / °C |
Vapour pressure / hPa |
20 |
0.14 |
25 |
0.20 |
50 |
1.05 |
Description of key information
Vapour pressure: 0.14 hPa at 20 °C, 0.20 hPa at 25 °C, 1.05 hPa at 50 °C (EU Method A.4, dynamic method)
Key value for chemical safety assessment
- Vapour pressure:
- 0.2 hPa
- 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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