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Melting point / freezing point

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melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From 01 October 2015 to 11 July 2017
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Composition 0
according to
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
July 1995
according to
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
May 2008
according to
EPA OPPTS 830.7200 (Melting Point / Melting Range)
Version / remarks:
March 1998
GLP compliance:
yes (incl. certificate)
Type of method:
differential scanning calorimetry
Test material information:
Composition 1
Melting / freezing pt.:
17.28 °C
Melting / freezing pt.:
17.01 °C
Melting / freezing pt.:
17.06 °C

Preliminary test result:

At 340°C, the sample weight had decreased by 25%

After the experiment, a light brown residue remained in the sample container. The change of the colour indicated reaction and/or decomposition of the test item.

Main test result:

In the first assay, an endothermic effect with three peaks between -25°C and 50°C was observed. Based on visual observations the effect was due to reaction and / or decomposition of the test item. The peak at 17.28°C was more probably due to the test item melting.

In order to determine the cause of these peaks, a repeated heating cycle was applied in a second assay. At first a sample was heated from -25°C to 60°C. An important endothermic peak was observed at 17.01°C and two others peaks between -25 to 50°C also have been observed.

Then the sample has been cooled until -50°C. During cooling two peaks have (due the crystallization of the test item) have been observed. Finally, the sample has been heated until 340°C. Only one peak at 17.06°C has been observed. It is concluded that the two others peak observed between -25 and 50°C in the first experiment were due to the test item impurities.

The melting point of the test item is 17°C at atmospheric pressure
Executive summary:

The melting point of the test item has been determined using the method according to recognised guidelines and under GLP.

No deviation from these guidelines has been observed during the study.

Based on two experiments, the melting point of the test item has been determined to be 17°C at atmospheric pressure.

Description of key information

The test item melting point was determined in an experimental key study (Klimisch validity one, according to recognised guidelines).

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
17 °C

Additional information