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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:
November 27th, 2012 - April 7th, 2013
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
(2008)
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
(1995)
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 830.7200 (Melting Point / Melting Range)
Version / remarks:
(1998)
Deviations:
no
GLP compliance:
yes
Type of method:
thermal analysis
Remarks:
(differential scanning calorimetry)
Key result
Melting / freezing pt.:
-38 °C
Remarks on result:
other: Glass transition instead of melting. Temp: 235 K.

DSC experiment I: during cooling, a glass transition was observed between -40°C and -70°C. During heating a glass transition between -75°C and -25°C was observed (inflection point of the glass transition: -37.91°C). An endothermic peak was observed starting at 275°C, possibly due to evaporation of the test substance. After the experiment, a yellow residue remained in the sample container.

DSC experiment II: A higher end temperature was applied to determine the endothermic effect starting at 275°C. During cooling, a glass transition was observed between -40°C and -70°C. The inflection point of the glass transition during heating was -37.76°C. An endothermic peak was observed between 275°C and 400°C (extrapolated onset temperature: 362.08°C). The effect was possibly due to evaporation of the test substance. After the experiment, the test substance had evaporated from the sample container.

DSC experiment III: To investigate the endothermic peak a closed sample container was applied. The extrapolated onset temperature of the peak was 362.06°C. Since the endothermic peak did not shift to higher temperatures, reaction and/or decomposition of the test substance was the reason for the endothermic effect. After the experiment it was observed that the test substance had evaporated from the sample container.

TGA/DSC curves: see attached document.

Conclusions:
No melting temperature was determined for the test substance. A glass transition temperature of -38 °C was determined using differential scanning calorimetry in accordance with EC A.1, OECD 102 and EPA OPPTS 830.7200, and in compliance with GLP.

Description of key information

No melting temperature was determined for the

test substance. A glass transition temperature

of -38 °C was determined for the test substance

using differential scanning calorimetry in

accordance with EC A.1, OECD 102 and

EPA OPPTS 830.7200 and in compliance with GLP.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-38 °C

Additional information

No melting point has been identified for this substance.