Registration Dossier
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EC number: 929-889-1 | CAS number: -
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)
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- effusion method: Knudsen cell
- Key result
- Temp.:
- 25 °C
- Vapour pressure:
- 0.96 Pa
- Temp.:
- 20 °C
- Vapour pressure:
- 0.25 Pa
- Temp.:
- 50 °C
- Vapour pressure:
- 58 Pa
- Transition / decomposition:
- yes
- Remarks:
- exothermal effect in the range 180-240 °C, a second one in the range 260 - 345 °C (for details see chapter 4.1)
- Conclusions:
- The vapour pressure was calculated to be 0.96 Pa at 25 °C.
- Executive summary:
The dynamic method was used to determine the vapour pressure at 25 °C which conforms with the procedure 'Test method A.4', described in the EC Guideline. As a preliminary measurement, the determination of the thermal stability was carried out by differential scanning calorimetry (DSC). The measurement in the closed glass crucible showed an exothermal effect in the temperature range 180 - 240 °C and a second one in the temperature range 260 - 345 °C. Due to the fact that the vapour pressure values at 20, 25 and 50 °C calculated from the regression of the vapour pressure values of the dynamic method were only slightly above the recommended measuring range of the vapour pressure balance an additional measurement with the vapour pressure balance was performed. The vapour pressure was measured in the temperature range of 15 °C to 49 °C. The Antoine constants from the regression of the data from the dynamic method were used to calculate the vapour pressure for 20, 25 and 50 °C. Using the Antoine coefficients of the regression straight line the vapor pressure was calculated to be 0.96 Pa at 25 °C.
Reference
The Antoine constants from the regression of the data from the dynamic method were used to calculate the vapour pressure for 20, 25 and 50 °C.
The measurement in the closed glass crucible showed an exothermal effect in the temperature range 180 - 240 °C and a second one in the temperature range 260 - 345 °C (for details see chapter 4.1).
Description of key information
The vapour pressure was calculated to be 0.96 Pa at 25 °C.
Key value for chemical safety assessment
- Vapour pressure:
- 0.96 Pa
- at the temperature of:
- 25 °C
Additional information
Exothermal effects in the temperature range 180 - 240 °C and in the temperature range 260 - 345 °C were observed.
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