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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:
2019
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 830.7200 (Melting Point / Melting Range)
Deviations:
no
GLP compliance:
yes
Type of method:
differential scanning calorimetry
Specific details on test material used for the study:
Identification: Esacure 3644
Physical Description: Light yellow solid
Purity/Composition: UVCB
Storage Conditions: At room temperature protected from light
Melting / freezing pt.:
66.7 °C
Atm. press.:
101 325 Pa
Decomposition:
yes
Decomp. temp.:
300 °C

PRELIMINARY TEST

Starting at 375°C, the weight of the sample decreased significantly.  At 443°C, the sample weight had decreased by 25%.

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

MAIN STUDY

An endothermic effect was observed between 50°C and 100°C followed by a second endothermic effect starting at 300°C.  The extrapolated onset temperature of the first effect was 66.471°C.  The endothermic effect was most likely obtained due to melting of the test item.  The second endothermic effect was probably obtained due to reaction and/or decomposition of the test item.  After the experiment, an orange/brown molten residue remained in the sample container (original colour: light yellow).  The change of the colour indicated reaction and/or decomposition of the test item.  Based on this visual observation, it was found that the test item had molten and the change of the colour demonstrated reaction and/or decomposition of the test item.

In order to investigate the endothermic effect, Experiment 2 was stopped directly after the melting effect.  The extrapolated onset temperature was 66.868°C.  After the experiment, a yellow molten residue remained in the sample container (original colour: light yellow).  It demonstrated that melting was the reason for the endothermic effect.

The melting temperature was determined as the mean melting temperature of Experiment 1 (66.471°C) and Experiment 2 (66.868°C).

Conclusions:
The melting and boiling temperature of Esacure 3644 were determined by DSC.
The melting temperature of the test item was 66.7°C (339.8K).
Reaction and/or decomposition of the test item was observed starting at 300°C (573K). Boiling of the test item was not observed below the temperature at which reaction and/or decomposition started. Based on this, the test item has no boiling temperature.
Executive summary:

The melting point temperature was found to be 66.7°C (339.8K).

Description of key information

Study conducted to recognised testing guidelines with GLP certification

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
66.7 °C

Additional information