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EC number: 202-338-6 | CAS number: 94-49-5
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:
- April - June 2017
- Reliability:
- 1 (reliable without restriction)
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- other: ASTM E1782-08
- Deviations:
- no
- Principles of method if other than guideline:
- The test substance is introduced into an appropriate sample pan and together with an empty reference pan placed in the test chamber of a Differential Scanning Calorimetry (DSC) instrument, which is operated under an applied constant pressure between 0.025 kPa and 13 kPa. The test substance is heated at a constant rate until a boiling endotherm is measured. Boiling is observed at the temperature where the partial pressure of the test substance equals the pressure applied to the test chamber. The pressure is noted during observance of the boiling endotherm and the boiling temperature is measured as the extrapolated onset temperature. This measurement is repeated using new samples of the test substance for each of five or more different pressures covering the pressure range of interest. The pressure-temperature data are fitted as 10log P and 1/T with the Antoine vapour pressure equation. The vapour pressure in kilo Pascal (kPa) at 25°C is then calculated from the derived equation.
- GLP compliance:
- no
- Other quality assurance:
- other: ISO 9001
- Type of method:
- other: DSC( Differential scanning calorimetry)
- Temp.:
- 224.6 °C
- Vapour pressure:
- 5 100 Pa
- Temp.:
- 188.5 °C
- Vapour pressure:
- 500 Pa
- Temp.:
- 173.7 °C
- Vapour pressure:
- 200 Pa
- Temp.:
- 153.7 °C
- Vapour pressure:
- 54.6 Pa
- Temp.:
- 149.1 °C
- Vapour pressure:
- 28.3 Pa
- Temp.:
- 25 °C
- Vapour pressure:
- 0 Pa
- Remarks on result:
- other: extrapolated from test data at higher temperatures
- Conclusions:
- The calculated vapour pressure of solid test substance at 25°C is 5.6 * 10-6 Pa
- Executive summary:
The calculated vapour pressure of solid test substance at 25°C is 5.6 * 10-6 Pa
Reference
The vapour pressure of the test substance from the Clausius-Clapeyron chart can be given by the equation:
Ln P = -14.014*(1000/T)+29.75
This equation can be applied for the test substance in the liquid phase.
The vapour pressure of solid test substance at the DSC melting point (71.28 oC) is 0.017 Pa
Vapour pressure of the solid phase as a function of temperature incorporating the vapour pressure at the melting point is given by the following equation:
Ln P = -17.92*(1000/T) + 41.100
Calculation of the vapour pressure of solid test substance at 25 oC is 5.6E-06 Pa.
Description of key information
The calculated vapour pressure of solid test substance at 25°C is 5.6 * 10-6 Pa
Key value for chemical safety assessment
- Vapour pressure:
- 0 Pa
- at the temperature of:
- 25 °C
Additional information
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.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
