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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:
Testing was conducted between 05 October 2009 and 06 October 2009
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Study was conducted in compliance with agreed protocols with no or minor deviations from standard test guidelines and/or minor methodological deficiencies which do not affect the quality of relevant results.
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
Date of GLP Inspection: 19 August 2008 Date of Signature on Certificate: 4 March 2009
Type of method:
other: differential scanning calorimetry
Melting / freezing pt.:
> 723 K

See attached documents for thermograms.

Thermographic data for Determinations 1 and 2 are shown in the following tables.

Table 4.2 Thermographic Data - Determination 1

Thermal Event

Interpretation

Temperature

°C

K

Onset of endotherm

Loss of volatiles

188.09

461

Onset of endotherm

Loss of volatiles

256.78

530

Table 4.3 Thermographic Data - Determination 2

Thermal Event

Interpretation

Temperature

°C

K

Onset of endotherm

Loss of volatiles

188.60

462

Onset of endotherm

Loss of volatiles

257.72

531

Conclusions:
The test material was determined to have a melting temperature of greater than 723 K. The test material was identified as undergoing dehydration at approximately 461 K and 530 K. These thermal events were not associated with a phase transition (i.e. melting) of the test material.
Executive summary:

The test material was determined to have a melting temperature greater than 723 K, by differential scanning calorimetry, using ASTM E537-86, Method A1 Melting/Freezing Temperature of Commission Regulation (EC) No 440/2008 of 30 May 2008. The test material was identified as undergoing dehydration from approximately 461 and 530 K. These thermal events were not associated with a phase transition (i.e. melting) of the test material.

Description of key information

Melting point: > 450°C (EU Method A.1)

Key value for chemical safety assessment

Additional information