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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:
11.-17.12.2013
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline 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:
no
Type of method:
effusion method: vapour pressure balance
Temp.:
20 °C
Vapour pressure:
0 Pa
Key result
Temp.:
25 °C
Vapour pressure:
0 Pa
Temp.:
50 °C
Vapour pressure:
0 Pa

Thermal stability


The DSC-measurement in a closed glass crucible showed an endothermic effect in the temperature range of 75-95 °C, followed by a smaller endothermic in the temperature range of 140-150 °C. No further endo- or exothermic effects were observed up to the final temperature of 390 °C.


 


Vapour pressure balance (effusion method)


The vapour pressure was measured in the temperature range of 30 °C to 120 °C. The measured vapour pressures at the corresponding temperatures are listed in the following table:


















































Temperature / °C



Vapour pressure / hPa



30



1.4*10^-4



40



4.9*10^-5



50



5.5*10^-6



60



9.0*10^-6



70



2.1*10^-5



80



5.9*10^-5



90



1.8*10^-4



100



6.5*10^-4



110



1.6*10^-3



120



3.7*10^-3



The measured vapour pressure values between 30-40 °C were most likely caused by volatile impurities and were therefore not taken into account.


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


The following constants were determined: A=11.29209, B=-5426.19, C=273.15. Vapour pressures of 6.1*10^-8 hPa at 20 °C, 1.2*10^-7 hPa at 25 °C and 3.2*10^-6 hPa at 50 °C were determined.

Conclusions:
Vapour pressures of 6.1*10^-8 hPa at 20 °C, 1.2*10^-7 hPa at 25 °C and 3.2*10^-6 hPa at 50 °C were determined for the test item.
Executive summary:

A study was performed according to OECD 104 and Commission Regulation (EC) No. 440/2008, method A.4 in order to determine the vapour pressure of the test item by using the effusion method (vapour pressure balance). The vapour pressure was measured at various temperatures between 30 and 120 °C. The vapour pressures of the test item at 20, 25 and 50 °C were extrapolated by using the Antoine constants. Vapour pressures of 6.1*10^-8 hPa at 20 °C, 1.2*10^-7 hPa at 25 °C and 3.2*10^-6 hPa at 50 °C were determined.

Description of key information

Vapour pressures of 6.1*10^-8 hPa at 20 °C, 1.2*10^-7 hPa at 25 °C and 3.2*10^-6 hPa at 50 °C were determined for the test item.

Key value for chemical safety assessment

Vapour pressure:
0 Pa
at the temperature of:
20 °C

Additional information

A study was performed according to OECD 104 and Commission Regulation (EC) No. 440/2008, method A.4 in order to determine the vapour pressure of the test item by using the effusion method (vapour pressure balance). The vapour pressure was measured at various temperatures between 30 and 120 °C. The vapour pressures of the test item at 20, 25 and 50 °C were extrapolated by using the Antoine constants. Vapour pressures of 6.1*10^-8 hPa at 20 °C, 1.2*10^-7 hPa at 25 °C and 3.2*10^-6 hPa at 50 °C were determined.