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Physical & Chemical properties

Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
26 Apr 2004 - 21 June 2004
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
GLP certifying authority: Hess. Ministerium für Umwelt, Landwirtschaft und Forsten, Wiesbaden, Germany
Type of method:
effusion method: vapour pressure balance
Key result
Temp.:
20 °C
Vapour pressure:
0 Pa
Key result
Temp.:
25 °C
Vapour pressure:
0 Pa
Key result
Temp.:
50 °C
Vapour pressure:
0 Pa

Individual Results- Thermal Stability


Two DSC-measurements in closed glass crucibles showed an endothermic effect (melting) in the temperature range 195-215 °C, a small exothermal effect in the temperature range 240 - 340 °C and an exothermal decomposition in the temperature range 355 - 445 °C.


 


Individual Results – Vapor Pressure Balance (Effusion Method)


The vapor pressure was measured in the temperature range 35 °C to 136 °C. No signal was observed up to a temperature off 69 °C. Above 76 °C a vapour pressure could be measured. The measured vapor pressure at the corresponding temperatures are listed in the table below.


 


 






















































TemperatureI°C



Vapour pressureIhPa



76.2



2.4X 10-5



81.8



4.4X 10-5



82.1



4.4X 10-5



87.6



9.1X 10-5



93.6



2.0X 10-4



97.9



3.2X 10-4



104.7



7.6X 10-4



112.5



1.8X 10-3



121.5



4.8X 10-3



126.4



7.7X 10-3



135.7



2.0X 10-2



 


Vapor Pressure - Temperature dependence of Test Item:


























T ( °C )



p (hPa)



log (p/hPa) = A +B/(C+T)



20



2.66E-09



A = 15.69588



25



6.80E-09



B = -7114.83



50



4.77E-07



C = 273.15



 


Final Results – Vapour Pressure


The calculated vapour pressure values are extrapolated:


 


























T in °C



P in hPa



P in Pa



20



2.7X 10 -9



2.7X 10-7



25



6.8X 10 -9



6.8X 10-7



50



4.8X 10-7



4.8X 10-5


Description of key information

The extrapolated vapor pressure values:


2.7E-9 hPa at 20 °C


6.8E-9 hPa at 25 °C


4.8E-7 hPa at 50 °C


(OECD Guideline 104, effusion method: vapour pressure balance)

Key value for chemical safety assessment

Vapour pressure:
0 hPa
at the temperature of:
25 °C

Additional information