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Boiling point

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Reference
Endpoint:
boiling point
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.2 (Boiling Temperature)
Version / remarks:
European Commission Regulation (EC) No. 440/2008,
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 103 (Boiling Point)
Deviations:
no
GLP compliance:
no
Type of method:
differential scanning calorimetry
Key result
Boiling pt.:
ca. 380 °C
Atm. press.:
ca. 1 013.25 hPa
Decomposition:
yes
Decomp. temp.:
380 °C

Two DSC measurements in aluminium crucibles with a hole showed an endothermal effect after the


melting in the temperature range of 335 - 440 °C. The onset temperature (see Table) was derived


from the intersection of the tangent line with the highest slope of the endothermal peak with the


baseline. The mass loss after the DSC measurements amounted to approximately 100%.


 


 


Table 1: Boiling Point (DSC measurement).





































Ident No.



Test item /mg



Starting temperature / °C



Final test temperature / °C



Temperature range (boiling) / °C



Onset / °C



Crucible



Observations after the measurement



35703



10.20



25



500



335-440



380.79



Aluminium with a hole



Mass loss 100%



35705



11.51



25



500



335-440


 



381 .55



Aluminium with a hole



Mass loss 100%




 


A additional measurement with the capillary method was performed to clarify the results of the DSC measurements. Since this measurement was performed only as a verifying screening a high heating rate of 10 K/min was chosen and therefore the absolute temperature values derived with the capillary method are not as accurate as the DSC results. The filling height of the test item was approximately 5 mm.


 


Results of the capillary method





















No.



Set point/°C



Heating rate/ K/min



Endpoint/ °C



Remarks



1



309



10



400



Approx. 300 °C: test item liquid, slightly discoloured to


Brown


Approx. 343 °C: first bubbles occurred, test item discoloured


further to a darker shade


Approx. 391 °C: test item boiled


Approx. 400 °C: test item discoloured to black




 


Under consideration of the results from the the DSC measurements and the capillary method it was


concluded that the test item boiled under decomposition at approximately 380 °C. lt cannot be


excluded that decomposition started before boiling.

Conclusions:
The test item boiled under decomposition at approximately 380 °C.
Executive summary:

A study was conducted according to OECD test guideline 103 and Regulation (EC) No 440/2008 method A.2 to determine the boiling point of the test item using differential scanning calorimetry.  The test item and the reference are heated up from the starting temperature to the final temperature at a constant heating rate in a defined atmosphere (nitrogen). Open crucibles are used as containers for the test item and as empty reference crucible. The quantity of heat absorbed or released is measured and recorded.


The test item showed an endothermal effect in the temperature range of 335 - 440 °C. An additional measurement with the capillary method was performed in order to clarify the melting range. Under consideration of the results from the DSC measurements and the capillary method it was concluded that the test item The test item boiled under decomposition at approximately 380 °C.

Description of key information

The test item had a boiling point of approx. 380°C.

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
380 °C
Temperature of decomposition (state purity):
380 °C

Additional information

A study was conducted according to OECD test guideline 103 and Regulation (EC) No 440/2008 method A.2 to determine the boiling point of the test item using differential scanning calorimetry (DSC 25 - 500 °C). The test item and the reference are heated up from the starting temperature to the final temperature at a constant heating rate in a defined atmosphere (nitrogen). Open crucibles are used as containers for the test item and as empty reference crucible. The quantity of heat absorbed or released is measured and recorded. The test item showed an endothermal effect in the temperature range of 335 - 440 °C under atmospheric conditions.


An additional measurement with the capillary method was performed in order to clarify the boiling point. Under consideration of the results from the DSC measurements and the capillary method it was concluded that the test item boiled under decomposition at approx. 380 °C.