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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:
25 April 2007 to 23 August 2007
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose:
reference to same 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
GLP compliance:
yes (incl. certificate)
Type of method:
thermal analysis
Remarks:
differential scanning calorimetry (DSC) confirmed by capillary method
Melting / freezing pt.:
> 500 °C
Decomposition:
yes
Decomp. temp.:
160 °C
Remarks on result:
other: No melting of the test item until the beginning of the exothermic decomposition between 160 and 500°C

Two DSC-measurements in closed glass crucibles showed no endothermic effect until the exothermic decomposition in the temperature range 160 - 500°C, or in the temperature range 165 - 375 °C with an energy of 496 Jig or 585 Jig, respectively.

No melting of the test item until the beginning of the exothermic decomposition at a temperature of 160 °C was observed.

This was proofed by an additional measurement with the capillary method.

Conclusions:
No melting of the test item until the beginning of the exothermic decomposition at a temperature of 160 °C was observed.
Executive summary:

The purpose of this study was the determination of the melting point of the test item according to the consolidated version of Council Directive 67/548/EEC Annex V (Council Directive 92/69/EEC), Part A: Methods for the determination of physico-chemical properties A.1. Melting point / melting range (DSC) and OECD test guideline OECD 102 (1995) Melting point / Melting range. The study was performed in accordance with the Principles of Good Laboratory Practice (GLP) and reported with a valid GLP certificate.

 

Thermal Stability Melting Point / Melting Range: Differential Scanning Calorimetry: The determination of the thermal stability was carried out by differential scanning calorimetry (DSC).

The test item and the standard material (aluminium oxide) were heated up from ambient to the final temperature (500°C) at a constant heating rate (3 K/min) in a defined atmosphere (nitrogen). The quantity of heat absorbed or released was measured and recorded. Closed glass crucibles were used as containers for the test item and the standard to determine the thermal stability. About 12 mg of the test item were used. The test was performed with the purified test item.

 

Melting point / Melting range: No melting of the test item until the beginning of the exothermic decomposition at a temperature of 160°C was observed.

Description of key information

No melting of the test item until the beginning of the exothermic decomposition at a temperature of 160 -500°C was observed.

Key value for chemical safety assessment

Additional information

The melting point of the test item was determined according to methods for the determination of physico-chemical properties A.1. Melting point / melting range (DSC) and OECD test guideline OECD 102 (1995) Melting point / Melting range. The determination of the thermal stability was carried out by differential scanning calorimetry (DSC).

The test item and the standard material (aluminium oxide) were heated up from ambient to the final temperature (500°C) at a constant heating rate (3 K/min) in a defined atmosphere (nitrogen). The quantity of heat absorbed or released was measured and recorded. Closed glass crucibles were used as containers for the test item and the standard to determine the thermal stability. About 12 mg of the test item were used. The test was performed with the purified test item.

No melting of the test item until the beginning of the exothermic decomposition at a temperature of 160°C was observed.