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EC number: 246-426-2 | CAS number: 24717-85-9
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:
- 01 to 19 August 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
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 0.009 hPa
- Key result
- Temp.:
- 25 °C
- Vapour pressure:
- 0.014 hPa
- Key result
- Temp.:
- 50 °C
- Vapour pressure:
- 0.089 hPa
- Conclusions:
- Vapour pressure values of 0.009 hPa (at 20 °C), 0.014 hPa (at 25 °C) and 0.089 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 no thermal effects up to a temperature of 300 °C.
Dynamic method: Vapour-liquid equilibrium (VLE)
The vapour pressure was measured in the temperature range of 159.4 to 190.7 °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 |
159.4 |
22.9 |
measured up |
2 |
165.4 |
30.3 |
measured up |
3 |
171.8 |
37.9 |
measured up |
4 |
180.2 |
49.9 |
measured up |
5 |
185.3 |
59.8 |
measured up |
6 |
190.7 |
68.8 |
measured up |
7 |
188.5 |
64.3 |
measured down |
8 |
183.2 |
56.1 |
measured down |
9 |
165.0 |
27.3 |
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 = 10.5113
B = -3090.34
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.
Temperature / °C |
Vapour pressure / hPa |
20 |
0.009 |
25 |
0.014 |
50 |
0.089 |
Description of key information
Vapour pressure: 0.009 hPa at 20 °C, 0.014 hPa at 25 °C and 0.089 hPa at 50 °C (EU Method A.4, dynamic method)
Key value for chemical safety assessment
- Vapour pressure:
- 0.014 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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