Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Melting point / freezing point

Currently viewing:

Administrative data

Link to relevant study record(s)

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