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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2010-08-31 to 2010-10-21
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose for cross-reference:
reference to same study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
, 2006
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
, 2008
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
, signed 2009-10-29
Type of method:
effusion method: vapour pressure balance
Temp.:
20 °C
Vapour pressure:
0.14 Pa
Remarks on result:
other: extrapolated value
Key result
Temp.:
22.5 °C
Vapour pressure:
0.22 Pa
Remarks on result:
other: measured value
Temp.:
25 °C
Vapour pressure:
0.28 Pa
Remarks on result:
other: extrapolated value
Temp.:
50 °C
Vapour pressure:
6.8 Pa
Remarks on result:
other: extrapolated value

The vapour pressure was measured in the temperature range of 12 °C to 50 °C. Above 15 °C a vapour pressure could be measured. The measured vapour pressures at the corresponding temperatures are listed in the following table:


 















































Temperature / °C



Vapour pressure / hPa



15.3



5.4 × 10-4



17.8



1.2 × 10-3



22.5



2.2 × 10-3



26.0



3.6 × 10-3



30.8



6.5 × 10-3



35.9



1.2 × 10-2



40.4



2.1 × 10-2



45.1



3.7 × 10-2



49.4



6.0 × 10-2




 


The values for 20, 25 and 50 °C are calculated, using the Antoine constants A, B and C :


 


log (p/hPa) = A + B/(C+T[°C])


A =  15,23659


B = -5302,10


C =  273,15


 




































T / °C



p / hPa



p / Pa



12*



4.4× 10-4



4.4× 10-2



20



1.4× 10-3



1.4× 10-1



22.5
measured



2.2× 10-3



2.2× 10-1



25



2.8× 10-3



2.8× 10-1



50



6.8× 10-2



6.8× 10-0



*Calculated by submitter using the Antoine equation as described above (at 12°C; standard environmental parameter of Table R.16-8. In ECHA guidance on IR & CSA Chapter R.16: Environmental exposure assessment).

Conclusions:
According to OECD Guideline 104 (1995) and EU Method A.4 (2008), the vapour pressure of the test substance at 22.5°C was measured at 0.22 Pa, the value at 20°C is extrapolated to 0.14 Pa.

Description of key information

The vapour pressure of the substance at 22.5°C was measured at 0.22 Pa, the value at 20°C is extrapolated to 0.14 Pa.

Key value for chemical safety assessment

Vapour pressure:
0.22 Pa
at the temperature of:
22.5 °C

Additional information