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EC number: 215-150-4 | CAS number: 1306-38-3
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:
- from 03 Nov 2005 to 19 Apr 2006
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Reason / purpose for cross-reference:
- reference to same study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Version / remarks:
- and EU method A1 (Melting / Freezing temperature)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- thermal analysis
- Key result
- Melting / freezing pt.:
- > 400 °C
- Decomposition:
- no
- Conclusions:
- Cerium dioxide does not melt under the conditions of the test.
- Executive summary:
Melting point of cerium dioxide was assessed using a thermal analysis, according to OECD Guideline 102 under GLP compliance.
A test item amount of 24.06 mg was heated up from 25°C to 400°C at a rate of 20°C/min during a preliminary test. The quantities of heat absorbed or released were measured by Differential Scanning Calorimeter and recorded. No endothermic heat effect was observed from which melting could be deduced. After the experiment, the sample was still a powder, losing about 0.6% of its mass.
The thermal analysis was repeated in a main test with 27.02 mg of test item in the same temperature range but with the rise adjusted to 10°C/min.
No endothermic reaction could be observed. After the experiment, the sample had lost about 0.2% of its mass and the sample was unchanged in appearance.
In conclusion, cerium dioxide does not melt under the conditions of the test.
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- data from handbook or collection of data
- Reason / purpose for cross-reference:
- reference to same study
- Reason / purpose for cross-reference:
- reference to same study
- Reason / purpose for cross-reference:
- reference to same study
- Qualifier:
- no guideline available
- Principles of method if other than guideline:
- No data
- GLP compliance:
- no
- Melting / freezing pt.:
- ca. 2 600 °C
- Conclusions:
- Melting point of cerium dioxide is 2600°C.
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- documentation insufficient for assessment
- Remarks:
- ; the melting point value is just cited, without further details on experimental conditions.
- Reason / purpose for cross-reference:
- reference to same study
- Reason / purpose for cross-reference:
- reference to same study
- Reason / purpose for cross-reference:
- reference to same study
- Qualifier:
- no guideline available
- Principles of method if other than guideline:
- No data
- GLP compliance:
- no
- Melting / freezing pt.:
- 2 400 °C
- Conclusions:
- Melting point of cerium dioxide is 2400°C.
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- documentation insufficient for assessment
- Remarks:
- ; the melting point value is just cited, without further details on experimental conditions.
- Reason / purpose for cross-reference:
- reference to same study
- Reason / purpose for cross-reference:
- reference to same study
- Reason / purpose for cross-reference:
- reference to same study
- Qualifier:
- no guideline available
- Principles of method if other than guideline:
- No data
- GLP compliance:
- no
- Melting / freezing pt.:
- 2 500 - 2 600 °C
- Conclusions:
- Melting point of cerium dioxide is 2500-2600°C.
Referenceopen allclose all
Preliminary test: No endothermic heat effect was observed from which melting could be deduced. After the experiment, the sample was still a powder, losing about 0.6% of its mass.
Main test: No endothermic reaction could be observed. After the experiment, the sample had lost about 0.2% of its mass and the sample was unchanged in appearance.
Description of key information
The bulk form of cerium dioxide did not melt under the conditions of the test.
Melting point > 400°C.
Key value for chemical safety assessment
Additional information
An experimental study, scored as Klimisch 1, is selected as a key study, giving a melting point > 400°C for the bulk form of cerium dioxide. Two publications and one reference handbook, all selected as supporting studies, give consistent high melting point values, ranging between 2400 and 2600°C.
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