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EC number: 688-329-1 | CAS number: 10175-31-2
Vapour pressure
Administrative data
Link to relevant study record(s)
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- 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:
- yes (incl. QA statement)
- Type of method:
- dynamic method
- Temp.:
- 20 °C
- Vapour pressure:
- 0.22 hPa
- Temp.:
- 25 °C
- Vapour pressure:
- 0.32 hPa
- Temp.:
- 50 °C
- Vapour pressure:
- 1.6 hPa
- Conclusions:
- The following vapour pressure values for the test item were extrapolated from the experimental data (vapour pressure dynamic method): 20 °C: 22 Pa and 25 °C: 32 Pa.
- Executive summary:
The purpose of this study was the determination of the vapour pressure of the test item according to European Commission Regulation (EC) No. 440/2008, A.4. Vapour pressure: Vapour pressure balance
OECD test guidelines, OECD 104 (2006) Vapour pressure and US EPA Product Properties Test Guideline OCSPP 830.7950 by vapour pressure dynamic method.
The vapour pressure is measured by determining the boiling point of the test item at various specified pressures between roughly 10 and 1000 hPa.
Before filling the test apparatus the whole equipment was flooded with nitrogen to minimize the presence of oxygen. After filling the apparatus with the test item the lowest desired pressure is set and the heating system is switched on. The temperature is measured by a resistance thermometer. Equilibrium is reached when a constant boiling temperature is achieved at a given pressure. After recording this point the pressure is increased step by step and if possible up to the boiling point.The following vapour pressure values for the test item were extrapolated from the experimental data (vapour pressure dynamic method): 20 °C: 22 Pa and 25 °C: 32 Pa.
Reference
The values for 20, 25 and 50 °C are calculated, using the Antoine constants.
Description of key information
The purpose of this study was the determination of the vapour pressure of the test item according to European Commission Regulation (EC) No. 440/2008, A.4. Vapour pressure: Vapour pressure balance
OECD test guidelines, OECD 104 (2006) Vapour pressure and US EPA Product Properties Test Guideline OCSPP 830.7950 by vapour pressure dynamic method.
The vapour pressure is measured by determining the boiling point of the test item at various specified pressures between roughly 10 and 1000 hPa.
Before filling the test apparatus the whole equipment was flooded with nitrogen to minimize the presence of oxygen. After filling the apparatus with the test item the lowest desired pressure is set and the heating system is switched on. The temperature is measured by a resistance thermometer. Equilibrium is reached when a constant boiling temperature is achieved at a given pressure. After recording this point the pressure is increased step by step and if possible up to the boiling point.
The following vapour pressure values for the test item were extrapolated from the experimental data (vapour pressure dynamic method): 20 °C: 22 Pa and 25 °C: 32 Pa.
Key value for chemical safety assessment
- Vapour pressure:
- 22 Pa
- at the temperature of:
- 20 °C
Additional information
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