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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:
Experimental starting date: 21 May 2014 and Experimental Completion date: 24 September 2014
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 103 (Boiling Point)
Version / remarks:
27 July 1995
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.2 (Boiling Temperature)
Version / remarks:
30 May 2008
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
differential scanning calorimetry
Key result
Decomposition:
yes
Decomp. temp.:
257 °C
Remarks on result:
other: As the test item decomposed, no value for boiling temperature could be determined.

The thermographic data for the determination 1 to 4 are shown in the following table:

 Determination Atmosphere  Thermal Event  Interpretation  Temperature °C  Temperature K 
 1  Nitrogen  Exotherm  Decomposition - Start  270 543 
 1  Nitrogen  Exotherm  Decomposition - Onset  286 560 
 2  Nitrogen   Exotherm   Decomposition - Start 275  548 
 2  Nitrogen   Exotherm   Decomposition - Onset  301 575 
 3  Air   Exotherm   Decomposition - Start  265 539 
 3  Air  Exotherm   Decomposition - Onset  291 564 
 4  Air   Exotherm   Decomposition - Start  257 530 
 4  Air   Exotherm   Decomposition - Onset  287 560 

Atmospheric pressure: 101.1 kPa

After heating to 450°C, the residue had only lost approximately 10% of its original weight.

Overall result: Decomposition from approximately 257°C (530K)

DISCUSSION:

The start of the exothermic peak has been taken as the start of the decomposition rather than the onset temperature (range:286 to 301°C) as by this temperature there had already been a significant change in heat flow indicating that an exothermic reaction was already accuring prior to the onset temperature.

As a result of the low rate of enthalpy change during decomposititon, the start of decomposition could only be approximated.

Similar thermographic profiles were obtained using air and nitrogen atmospheres; this indicated the the observed decomposition in both determinations was probably thermal and not oxidative.

CONCLUSION:

The test item has been determined to decompose from approximately 257°C (530K) at 101.0kPa.

As the test item decomposed, no value for boiling temperature could be detremined.

Conclusions:
The test item has been determined to decompose from approximately 257°C (530K) at 101.0kPa.
As the test item decomposed, no value for boiling temperature could be detremined.
Executive summary:

Boiling temperature: Decomposed from approximately 257°C (530K) at 101.0kPa by differential scanning calorimetry using ASTM E537 -86, designed to be compatible with Method A2 Boiling Temperature of Commission Regulation (EC) N°440/2008 of 30 May 2008 and Method 103 of the OECD Guidelines for Testing of Chemicals, 27 July 1995. As the test item decomposed, no value for boiling temperature could be determined.

Description of key information

Key value for chemical safety assessment

Additional information

Boiling temperature:Decomposed from approximately 257°C (530K) at 101.0kPa by differential scanning calorimetry using ASTM E537 -86, designed to be compatible with Method A2 Boiling Temperature of Commission Regulation (EC) N°440/2008 of 30 May 2008 and Method 103 of the OECD Guidelines for Testing of Chemicals, 27 July 1995. As the test item decomposed, no value for boiling temperature could be determined.

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