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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:
13 September 2017
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
comparable to guideline study with acceptable restrictions
no guideline followed
Principles of method if other than guideline:
The method aims to investigate the temperature behaviour of silicon zirconium oxide. A thermogravimetric (TG) analyser together with a Differential Thermal (DTA) analysis was used for this.
GLP compliance:
not specified
Type of method:
thermal analysis
Key result
Melting / freezing pt.:
> 1 000 °C
Remarks on result:
other: a white product was obtained after the experiment

One continuous weight loss that totals 0.8% is noticed between room temperature and 550°C.

This weight loss corresponds to dehydration of material and it is accompanied by an endotherm in the DTA profile that has a maximum below 100°C.

No other weight loss or phase transition occurs up to 1000°C.

TG/DTA scans prove that silicon zirconium oxide only undergoes a dehydration process when heated from room temperature up to 1000°C, the final product being a white powder.

Description of key information

An in-house experimental study (MEL Chemicals, 2017, Klimisch 2) based on TG/DTA scans demonstrates that silicon zirconium oxide does not melt up to and including at a temperature of 1000°C. Only dehydration was observed. The final product after heating is a white powder. The melting point is > 1000°C.

Key value for chemical safety assessment

Additional information