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Physical & Chemical properties

Melting point / freezing point

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Administrative data

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melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2010-03-23 to 2010-04-30
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP guideline study.
Reason / purpose for cross-reference:
reference to same study
according to guideline
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
, 2008
GLP compliance:
yes (incl. QA statement)
signed 2009-11-26
Type of method:
thermal analysis
Melting / freezing pt.:
> 450 °C
Remarks on result:
other: No significant thermal events were obtained during Determination 1 (atmosphere: air (static)) and Determination 2 (atmosphere: nitrogen). Residue: beige powder
The melting point temperature of the test item has been determined to be greater than 450 °C (> 723 K).

Description of key information

Melting point: > 450 °C (study result, EU A.1 method).

Key value for chemical safety assessment

Additional information

For the evaluation of this endpoint, results from a guideline conform study (EU A.1 method) were used as key information supported by data from the CRC handbook, the Merck index, the Römpp lexicon and the Holleman and Wiberg handbook. The available and generated data describe a melting point of greater than 450 °C for calcium oxide under given test conditions. Literature data for calcium carbonate also show the melting point to be greater than 450 °C and grades of calcium oxide with up to 35% calcium carbonate are not expected to be significantly different to that given by the key study.