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Diss Factsheets
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EC number: 939-960-9 | CAS number: 39318-32-6
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data

Melting point / freezing point
Administrative data
Link to relevant study record(s)
- Endpoint:
- melting point/freezing point
- Type of information:
- not specified
- Adequacy of study:
- weight of evidence
- Study period:
- not specified
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- other: Data from SDS of manufacturer. Original report not available.
- Principles of method if other than guideline:
- No data (original source not available).
- GLP compliance:
- not specified
- Type of method:
- other: no data
- Melting / freezing pt.:
- ca. 2 500 °C
- Conclusions:
- The melting point was reported to be ca. 2500°C. The original source is not available.
- Endpoint:
- melting point/freezing point
- Type of information:
- not specified
- Adequacy of study:
- weight of evidence
- Study period:
- not specified
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- other: Data from SDS of manufacturer. Original report not available.
- Principles of method if other than guideline:
- No data (original source not available).
- GLP compliance:
- not specified
- Type of method:
- other: no data
- Melting / freezing pt.:
- ca. 2 700 °C
- Conclusions:
- The melting point was reported to be ca. 2700 °C. The original source is not available.
- Endpoint:
- melting point/freezing point
- Type of information:
- read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- weight of evidence
- Justification for type of information:
- Read across based on the available handbook data for MgO and ZrO2. The read across justification document is attached in IUCLID Section 13.
- Reason / purpose for cross-reference:
- read-across source
- Reason / purpose for cross-reference:
- read-across source
- Reason / purpose for cross-reference:
- read-across source
- Reason / purpose for cross-reference:
- read-across source
- Key result
- Remarks on result:
- other: Based on handbook data for the melting point of MgO and ZrO2, it can be concluded that magnesium zirconium oxide has an equally high melting point (> 2500°C). No precise value could be derived from the read across data.
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Study period:
- no data
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- data from handbook or collection of data
- Principles of method if other than guideline:
- Data were obtained from the CRC handbook.
- GLP compliance:
- not specified
- Type of method:
- other: no data
- Melting / freezing pt.:
- 2 825 °C
- Atm. press.:
- 101.325 kPa
- Conclusions:
- According to the reference, magnesium oxide has a melting point of 2825°C.
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Study period:
- no data
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- data from handbook or collection of data
- Principles of method if other than guideline:
- Data were obtained from the Merck index.
- GLP compliance:
- not specified
- Type of method:
- other: no data
- Melting / freezing pt.:
- 2 800 °C
- Atm. press.:
- 101.325 kPa
- Conclusions:
- According to the reference, magnesium oxide has a melting point of 2800°C.
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Study period:
- no data
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- data from handbook or collection of data
- Principles of method if other than guideline:
- Data in this peer-reviewed publication were taken from many sources, including both compilations and primary literature. Where conflicts were found, the value deemed most reliable was chosen for inclusion in the handbook. Reference sources were not provided for this parameter, nor were the experimental methods.
- GLP compliance:
- not specified
- Type of method:
- other: no data
- Melting / freezing pt.:
- ca. 2 710 °C
- Conclusions:
- The melting point of zirconium dioxide was reported to be 2710°C.
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Study period:
- no data
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- data from handbook or collection of data
- Principles of method if other than guideline:
- Data in this peer-reviewed publication were taken from many sources, including both compilations and primary literature. Where conflicts were found, the value deemed most reliable was chosen for inclusion in the handbook. Reference sources were not provided for this parameter, nor were the experimental methods.
- GLP compliance:
- not specified
- Type of method:
- other: no data
- Melting / freezing pt.:
- 2 680 °C
- Conclusions:
- The melting point was reported to be 2680°C.
Referenceopen allclose all
Description of key information
Based on melting point data available for the individual substances ZrO2 and MgO and based on supporting data from two manufacturers on magnesium zirconium oxide (Safety Data Sheets), the substance magnesium zirconium oxide can be concluded to have a high melting point (at least 2500 °C).
Key value for chemical safety assessment
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 magnesium 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 2825°C and 2800°C, depending on the handbook. It can therefore be concluded that the melting point of magnesium oxide is around 2800°C.
3. Information on magnesium zirconium oxide
Supporting data on the substance itself were obtained from the safety data sheets of two manufacturers (Saint-Gobain, 2012; Imerys, 2015). The melting point of the substance was reported to be ca. 2700°C and ca. 2500°C, respectively. The original reports were however not available (i.e., the information was assigned a Klimisch 4 score).
4. Conclusion on magnesium zirconium oxide
Based on information on the individual components of the substance, i.e. zirconium dioxide and magnesium oxide, the melting point of magnesium zirconium oxide could also be expected to be very high. This was supported by the melting point values of ca. 2700°C and ca. 2500°C mentioned in the SDS of two manufacturers of magnesium zirconium oxide. All data were used in a weight of evidence approach to cover the endpoint.
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