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EC number: 213-448-9 | CAS number: 950-33-4
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:
- 24-Nov-2014
- 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:
- 0.16 hPa
- Key result
- Temp.:
- 25 °C
- Vapour pressure:
- 0.21 hPa
- Key result
- Temp.:
- 50 °C
- Vapour pressure:
- 0.8 hPa
- Conclusions:
- Vapour pressure values of 0.16 hPa (at 20 °C), 0.21 hPa (at 25 °C) and 0.8 hPa (at 50 °C) were determined for the test substance according to EU Method A.4.
Reference
Dynamic method: Vapour-liquid equilibrium (VLE)
The vapour pressure was measured in the temperature range of 114.0 to 167.8 °C. The measured vapour pressure values together with the measured temperatures are given Table 1.
Table 1: Results of the dynamic method
No. |
Temperature / °C |
Vapour pressure / hPa |
Remark |
1 |
114.0 |
11.7 |
Measured up |
2 |
133.9 |
19.7 |
Measured up |
3 |
147.2 |
29.9 |
Measured up |
4 |
155.6 |
39.9 |
Measured up |
5 |
161.3 |
49.8 |
Measured up |
6 |
167.8 |
59.5 |
Measured up |
7 |
161.6 |
49.6 |
Measured down |
8 |
146.8 |
29.9 |
Measured down |
9 |
121.1 |
14.9 |
Measured down |
From the measured data points of the vapour pressure curve of the constants A, B and C of the Antoine equation:
Log10 ρ = A + B / C + θ
Can be derived by regression (Microsoft excel) of the data points
A = 8.8311
B = -2239.00
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.
Table 2: Calculated vapour pressure values for 20, 25 and 50 °C
Temperature / °C |
Vapour pressure / hPa |
20 |
0.16 |
25 |
0.21 |
50 |
0.80 |
Description of key information
Vapour pressure: 0.21 hPa at 25 °C (EU Method A.4, dynamic method)
Key value for chemical safety assessment
- Vapour pressure:
- 0.21 hPa
- at the temperature of:
- 25 °C
Additional information
Vapour pressure values of 0.16 hPa (at 20 °C), 0.21 hPa (at 25 °C) and 0.8 hPa (at 50 °C) were determined for the test substance according to EU Method A.4.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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