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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:
2015-05-05
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
comparable to guideline study with acceptable restrictions
Qualifier:
according to guideline
Guideline:
other: ASTM E 537-76
GLP compliance:
no
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
69 °C
Atm. press.:
1 atm
Decomposition:
yes
Decomp. temp.:
>= 76 - <= 154 °C

DSC measurement in an open Al crucible shows a sharp melting signal of -86 J/g with onset at 69 °C, which is followed directly by exothermic decomposition between 76 °C and 154 °C (795 J/g). The maximum heat flow is 4 W/g at 116 °C.

Conclusions:
The melting point of the test item is 69 °C at atmospheric pressure.
Executive summary:

The melting point of the test item was investigated by DSC measurement according to ASTM E 537-76 and is 69 °C at atmospheric pressure. Directly after the melting point, the substance decomposes between 76 °C and 154 °C, which is indicated by a strong exothermic signal of 795 J/g.

Description of key information

The melting point of the test item was investigated by DSC measurement according to ASTM E 537-76 and is 69 °C at atmospheric pressure.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
69 °C

Additional information

Directly after the melting point, the substance decomposes between 76 °C and 154 °C, which is indicated by a strong exothermic signal of 795 J/g.