Registration Dossier
Registration Dossier
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EC number: 234-373-8 | CAS number: 11129-15-0
Melting point / freezing point
Administrative data
Link to relevant study record(s)
Description of key information
Based on melting point data available for the individual substances ZrO2 and CaO and based on supporting data from a manufacturer on calcium zirconium oxide itself (Safety Data Sheet), the substance calcium zirconium oxide can be concluded to have a high melting point (ca. 2500 °C).
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- 2 500 °C
Additional information
1. Information on zirconium dioxide
Although only two values are available from peer reviewed handbooks, it can be safely concluded that the melting point of zirconium dioxide is approximately 2700°C, making it environmentally irrelevant. The differences in results are assumed to be caused by the error of measurement at high melting temperatures and it is concluded that the melting point of zirconium dioxide is around 2700 °C.
2. Information on calcium oxide
Two values for the melting point of the substance were obtained from peer reviewed handbooks. The melting point of the substance was reported to be 2613°C and 2572°C, depending on the handbook.
3. Information on calcium zirconium oxide
Supporting data on the substance itself were obtained from a manufacturer (UCM Zirconia, 2014). The melting point of the substance was mentioned to be ca. 2500°C in the SDS of this manufacturer. The original source is not available (i.e., the information was assigned a Klimisch 4 score).
4. Conclusion on calcium zirconium oxide
Based on information on the individual components of the substance, i.e. zirconium dioxide and calcium oxide, the melting point of calcium zirconium oxide could also be expected to be very high (at least > 2000°C). This was supported by the melting point value of ca. 2500°C mentioned in the SDS of a manufacturer of calcium zirconium oxide. All data were used in a weight of evidence approach to cover the endpoint.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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