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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:
23 March - 05 April, 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
July 27, 1995
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
31 May 2008
Deviations:
no
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7200 (Melting Point / Melting Range)
Version / remarks:
March 1998
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
> 500 °C
Remarks on result:
other:
Remarks:
Decomposition and sublimation were not observed

After the experiments the test item was cohered in the crucible and its color darkened.

The endotherm and exotherm peaks in the thermogramsdo not implyphase transition from a solid to liquid state. Using a linear heating rate melting point was not observed from room temperature up to 500 °C.

Conclusions:
The test was carried out at normal atmospheric pressure. Using a linear heating rate melting point was not observed from room temperature up to 500 °C
Executive summary:

For the determination of the melting point or melting range, differential scanning calorimetry method was used. A small amount of the test item was inserted into the furnace of the device and the melting point was determined based on measuring the heat flow while raising the temperature. The heat flow in and out of a sample and a reference sample was measured as a function of temperature as the sample was heated. When the sample undergoes a phase transition, the corresponding change of enthalpy gives a departure from the base line of the heat flow record. The difference in energy input necessary to maintainidenticaltemperatures between the substance and the reference sample is recorded. The measurement signal is the energy absorbed by or released by the sample. The test was carried out at normal atmospheric pressure. Using a linear heating rate melting point was not observed from room temperature up to 500 °C

 

Description of key information

The test was carried out at normal atmospheric pressure. Using a linear heating rate melting point was not observed from room temperature up to 500 °C

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