oxozirconium; silane

Melting point / freezing point

Link to relevant study record(s)

Reference

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

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.

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.

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.