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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 15 June 2011 and 20 December 2011.
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Study 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 the relevant results. The study report was conclusive, done to a valid guideline and the study was conducted under GLP conditions.
Qualifier:
equivalent or similar to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
Qualifier:
equivalent or similar to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
thermal analysis
Remarks:
differential scanning calorimetry (DSC)
Key result
Decomposition:
yes
Decomp. temp.:
ca. 119 °C
Sublimation:
no
Remarks on result:
not determinable
Remarks:
The test item has been determined to decompose from approximately 119°C (392 K) without melting.

Results

Thermograms for Determinations 1 and 2 are shown in Figure 5.1 and Figure 5.2 (see attachment 1 in attached background material).

Visual determination

The test item was observed to change in colour from a cream powder to a grey solid from approximately 119°C (392 K), indicative of decomposition.

Conclusions:
Visual assessment of the melting temperature, determined using a metal blcok apparatus, indicated that the test item has been determined to decompose from approximately 119°C (392 K) without melting.
Executive summary:

The determination was carried out by differential scanning calorimetry (DSC) using the procedure specified in ASTM E537-86 and a procedure using a capillary in a metal block device, designed to be compatible with Method A1 Melting/Freezing Temperature of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 102 of the OECD Guidelines for Testing of Chemicals, 27 July 1995.

The test item has been determined to decompose from approximately 119°C (392 K) without melting.

Description of key information

The test item has been determined to decompose from approximately 119°C (392 K) without melting.

Key value for chemical safety assessment

Additional information

As a result of the low rate of enthalpy change during decomposition, the temperature at which the onset of decomposition occurred could not be determined by differential scanning calorimetry (DSC).

A visual assessment of the melting temperature was determined using a metal block apparatus. A small amount of test item was ground and placed in a capillary tube fused at one end. The test item was observed to change in colour from a cream powder to a grey solid from approximately 119°C (392 K) indicative of decomposition.