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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:
2008-05-28
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
other: OECD 113
Deviations:
no
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)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
dynamic method
Key result
Temp.:
20 °C
Vapour pressure:
0.2 hPa
Key result
Temp.:
25 °C
Vapour pressure:
0.34 hPa
Key result
Temp.:
50 °C
Vapour pressure:
3.18 hPa

Thermal Stability: 


The DSC-measurement in a closed glass crucible showed an exothermal decompositon in the temperature range of 230 - 365 °C with an energy of 985 J/g. 


 


Vapour presseure (dynamic method):


The vapour pressure was measured with the dynamic method in the temperature range of 66 °C to 168 °C. The measured vapour pressure at the corresponding temperatures are listed in the following table: 





















































Temperature / °C Vapour pressure / hPa 
72.515.1
95.2550.6
111.58 100.8
128.94 200.1
157.42500.6
167.75684.6
162.89599.9
140.25300.1
121.51150.5
84.6229.5
66.3  9.6

 


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


Parameters of the Antoine equation (log (p/hPa) = A+B/(C+T[°C])


A= 6.232749


B = -985.60


C= 121.99


 


The resuslts for the vapour pressures are:


 

























T / °Cp/hPap/Pa
200.20.20
250.340.34
503.18318
Conclusions:
The vapour pressure of the test item was determined to be 0.2 hPa at 20 °C according to EU A.4

Description of key information

0.34 hPa at 25 °C

Key value for chemical safety assessment

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

Additional information

GLP study according to OECD Guideline 104 and EU Method A.4 using the dynamic method.

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