Registration Dossier
Registration Dossier
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EC number: 811-319-7 | CAS number: 174633-44-4
Melting point / freezing point
Administrative data
Link to relevant study record(s)
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 13 September 2017
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- comparable to guideline study with acceptable restrictions
- Qualifier:
- 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
- Decomposition:
- no
- Sublimation:
- no
- Remarks on result:
- other: a white product was obtained after the experiment
- Conclusions:
- 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.
Reference
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.
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
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