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Boiling point

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Reference
Endpoint:
boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
June 2017 to Nov. 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
comparable to guideline study
Justification for type of information:
Differential scanning calorimetry is one of the methods applicable for determination of the boiling point according to OECD 103.
Qualifier:
according to guideline
Guideline:
OECD Guideline 103 (Boiling Point/Boiling Range)
Version / remarks:
Adopted: 27.07.95
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.2 (Boiling Temperature)
Version / remarks:
European Commission Regulation (EC) No. 440/2008
Deviations:
no
GLP compliance:
no
Type of method:
differential scanning calorimetry
Key result
Atm. press.:
ca. 1 013 hPa
Decomposition:
yes
Decomp. temp.:
>= 220.06 °C
Remarks on result:
other: Exothermal decomposition before boiling

No endothermal effect other than the one referred to as melting (onset 72.92 °C; peak 82.25 °C) was detected up to a temperature of approx. 170 °C. The exact melting temperature was determined seperately (see IUCLID section 4.2, Melting point) as the single/first heating run still includes the thermal history of the substance and therfore does not give a standardised, reproducible result.

At > 200 °C the onset of an exothermal effect indicated the reaction of the test item with air. As the residual test item in the crucibles proved to be black/dark brown, the authors conclude, that decomposition took place.

Results:

 Exothemal decomposition onset temperature 220.06 °C

 Boiling point: not determinable, exothermal decomposition before boiling

Conclusions:
Boiling point (OECD 103; DSC) at ambient pressure (ca. 1013 hPa): not determinable, decompositon before boiling.
Exothemal decomposition onset temperature: 220.06 °C
Executive summary:

The boiling point for the test item was determined in a reliable study using differential scanning calorimetry according to relevant guidelines (OECD 103; EU method A.2).

Based on the Indium standard, an accuracy of the measurement of 99.94% was determined.

The test item was heated up from ambient temperatue to the final temperature (500 °C) at a constant heating rate (10 K/min) in an atmosphere of air.

No endothermal effect other than the one referred to as melting was detected up to a temperature of approx. 170 °C.

At > 200 °C the onset of an exothermal effect indicated the reaction of the test item with air. As the residual test item in the crucibles proved to be black/dark brown, the authors conclude that decomposition took place.

Results:

 Exothemal decomposition onset temperature 220.06 °C

 Boiling point: not determinable, exothermal decomposition before boiling

Description of key information

Boiling point (OECD 103; DSC) at ambient pressure (ca. 1013 hPa): not determinable, decompositon before boiling.

Exothemal decomposition onset temperature: 220.06 °C

Boiling point >220.06 °C

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
220.06 °C

Additional information

The boiling point for the test item was determined in a reliable study using differential scanning calorimetry according to relevant guidelines (OECD 103; EU method A.2).

Based on the Indium standard, an accuracy of the measurement of 99.94% was determined.

The test item was heated up from ambient temperatue to the final temperature (500 °C) at a constant heating rate (10 K/min) in an atmosphere of air.

No endothermal effect other than the one referred to as melting was detected up to a temperature of approx. 170 °C.

At > 200 °C the onset of an exothermal effect indicated the reaction of the test item with air. As the residual test item in the crucibles proved to be black/dark brown, the authors conclude that decomposition took place.

Results:

 Exothemal decomposition onset temperature 220.06 °C

 Boiling point: not determinable, exothermal decomposition before boiling

Exothermal decomposition onset temperature taken as key value for the boiling point.

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