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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:
18 April - 10 May, 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7200 (Melting Point / Melting Range)
Version / remarks:
1998
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
1995 July 25
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
2008May 31
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
differential scanning calorimetry
Specific details on test material used for the study:
Expiry date 28 July 2020
Storage room temperature
Key result
Remarks on result:
other: After the experiments no change was observed in the appearance of the test item.
Remarks:
The endotherm and exotherm peaks in the thermograms do not imply phase 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:
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.

Description of key information

Using a linear heating rate melting point was not observed from room temperature up to 500 °C

Key value for chemical safety assessment

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