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EC number: - | CAS number: 20126-76-5
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 26 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:
- 0.64 hPa
- Key result
- Temp.:
- 25 °C
- Vapour pressure:
- 0.87 hPa
- Temp.:
- 50 °C
- Vapour pressure:
- 3.49 hPa
- Conclusions:
- Vapour pressure values of 0.64 hPa (at 20 °C), 0.87 hPa (at 25 °C) and 3.49 hPa (at 50 °C) were determined for the test substance according to E.U. Method A.4.
Reference
Results
Thermal Stability
The test item showed a small exothermic effect in the temperature range of 260 - 300 °C with an energy of -10 J/g.
Results of the DSC-measurements on thermal stability
No. |
Sample weight / mg |
Start of effect / °C |
Energy / J/g |
PN10927 |
10.97 |
260 |
-10 |
Dynamic method: Vapour-liquid equilibrium (VLE)
The vapour pressure was measured in the temperature range of 66.0 to 143.4 °C. The measured vapour pressure values together with the measured temperatures are listed in the table below.
Results of the dynamic method
No. |
Temperature / °C |
Vapour pressure / hPa |
Remark |
1 |
66.0 |
7.9 |
measured up |
2 |
114.3 |
51.4 |
measured up |
3 |
123.3 |
74.8 |
measured up |
4 |
131.3 |
99.9 |
measured up |
5 |
137.8 |
124.5 |
measured up |
6 |
143.4 |
149.6 |
measured up |
7 |
139.7 |
131.7 |
measured down |
8 |
135.4 |
114.2 |
measured down |
9 |
102.2 |
34.9 |
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 = 9.7718
B = -2335.89
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 No. 440/2008 Method A.4.
Calculated vapour pressure values for 20, 25 and 50 °C
Temperature / °C |
Vapour pressure / hPa |
20 |
0.64 |
25 |
0.87 |
50 |
3.49 |
Description of key information
Vapour pressure: 0.64 hPa at 20 °C, 0.87 hPa at 25 °C, and 3.49 hPa at 50 °C (E.U. Method A.4, dynamic method)
Key value for chemical safety assessment
- Vapour pressure:
- 0.87 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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