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Physical & Chemical properties

Melting point / freezing point

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Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
from 2018-03-20 to 2018-03-26
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study without detailed documentation
Reference:
Composition 0
Qualifier:
equivalent or similar to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
Qualifier:
equivalent or similar to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
GLP compliance:
no
Type of method:
differential scanning calorimetry
Test material information:
Composition 1
Key result
Melting / freezing pt.:
> 72.5 °C
Decomposition:
yes
Decomp. temp.:
ca. 80.8 °C
Remarks on result:
other: energy of decomposition: 818.5 J/g

The analysis was carried out in the DSC 1 STAR SYSTEM by Mettler Toledo. A SWISSI M20 crucible was used for the determination. The measuring range was between 25 °C to 300 °C at a heating rate of 2.0 °C/min. The analysis was performed as a duplicate determination. The decomposition of the test item releases an average energy of 818.5 J/g. The onset temperature of melting is an average 72.5 ° C. The decomposition temperature is at an average of 80.8 °C.

Table 1. Individual measurements and results

   Onset (melting point) [°C]  Energy (decomposition) [J/g]  Decomposition temperature [°C]
 Measurement 1  73.46  841.82  80.77
 Measurement 2  71.56  795.25  80.91
 Mean  72.5  818.5  80.8

Table 2. Crucible leak test

   m (initial weight) [mg]

 m (weight after the test) [mg]

 Measurement 1  2.24  2.23
 Measurement 2  2.16  2.14
Conclusions:
Using DSC it was determined that the test item starts to decompose right after melting. The onset temperature of the melting process was determined to be 72.5 °C and the decomposition temperature was determined to be 80.8 °C.
Executive summary:

A study similar to OECD 102 and EU Method A.2 was performed to determine the melting point of the test item using differential scanning calorimetry (DSC). The analysis was carried out in the DSC 1 STAR SYSTEM by Mettler Toledo. A SWISSI M20 crucible was used for the determination. The measuring range was between 25 °C to 300 °C at a heating rate of 2.0 °C/min. The analysis was performed as a duplicate determination. The decomposition of the test item releases an average energy of 818.5 J/g. The onset temperature of melting is an average 72.5 ° C. The decomposition temperature is at an average of 80.8 °C.

Description of key information

Using DSC it was determined that the test item starts to decompose right after melting. The onset temperature of the melting process was determined to be 72.5 °C and the decomposition temperature was determined to be 80.8 °C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
72.5 °C

Additional information

A study similar to OECD 102 and EU Method A.2 was performed to determine the melting point of the test item using differential scanning calorimetry (DSC). The analysis was carried out in the DSC 1 STAR SYSTEM by Mettler Toledo. A SWISSI M20 crucible was used for the determination. The measuring range was between 25 °C to 300 °C at a heating rate of 2.0 °C/min. The analysis was performed as a duplicate determination. The decomposition of the test item releases an average energy of 818.5 J/g. The onset temperature of melting is an average 72.5 ° C. The decomposition temperature is at an average of 80.8 °C.