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EC number: 438-930-8 | CAS number: 2550-52-9
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 March to 12 April 2001
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Qualifier:
- according to guideline
- Guideline:
- other: Guideline 92/69/EEC of 31 July 1992, Annex.
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- Hessisches Ministerium für Umwelt, Energie, Jugend, Familie und Gesundheit
- Type of method:
- effusion method: vapour pressure balance
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 0.007 Pa
- Temp.:
- 25 °C
- Vapour pressure:
- 0.016 Pa
- Temp.:
- 50 °C
- Vapour pressure:
- 0.56 Pa
- Conclusions:
- Vapour pressure values of 0.0073 Pa (at 20 °C), 0.016 Pa (at 25 °C) and 0.56 Pa (at 50 °C) were determined for the test substance according to EU Method A.4.
Reference
Results
Preliminary test on thermal stability
As a preliminary measuring for determining the thermal stability of the test substance, a DSC was performed in a closed glass pan. The measurement shows an endothermic effect in the temperature range 55 - 90 °C and no exothermal effect until 350 °C.
Vapour pressure balance (effusion method)
The vapour pressure was measured in the temperature range of 17 to 68.5 °C. No signal was observed in the range 17 °C to 27.5 °C. Above 43 °C a vapour pressure was measured. The following table shows the measured pressure data at the corresponding temperatures.
Temperature [° C] |
Vapour pressure [hPa] |
43.1 |
2.1E-03 |
47.1 |
4.0E-03 |
51.2 |
6.8E-03 |
55.8 |
1.2E-02 |
61.8 |
2.3E-02 |
65.7 |
3.9E-02 |
68.5 |
5.8E-02 |
Final result
The calculated vapour pressure values are extrapolated:
p (20 °C) = 7.3E-5 hPa
p (25 °C) = 1.6E-4 hPa
p (50 °C) = 5.6E-3 hPa
Description of key information
Vapour pressure: 0.0073 Pa at 20 °C, 0.016 Pa at 25 °C, and 0.56 Pa at 50 °C (EU Method A.4, effusion method: vapour pressure balance)
Key value for chemical safety assessment
- Vapour pressure:
- 0.007 Pa
- at the temperature of:
- 20 °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.
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