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Physical & Chemical properties

Melting point / freezing point

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Endpoint:
melting point/freezing point
Type of information:
other: Handbook data
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Qualifier:
no guideline followed
Principles of method if other than guideline:
Handbook data - no method specified
GLP compliance:
no
Melting / freezing pt.:
825 °C
Decomposition:
yes
Remarks:
- decomposes into CaO and CO2
Decomp. temp.:
825 °C
Remarks on result:
other: Calcium carbonate (aragonite)
Melting / freezing pt.:
1 339 °C
Decomposition:
yes
Remarks:
- decomposes into CaO and CO2
Decomp. temp.:
825 °C
Remarks on result:
other: Calcium carbonate (calcite)
Conclusions:
The melting point of calcium carbonate as aragonite is 825 °C and as calcite is 1339 °C. At about 825 °C calcium carbonate decomposes into CaO and CO2.
Endpoint:
melting point/freezing point
Type of information:
other: Handbook data
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Qualifier:
no guideline followed
Principles of method if other than guideline:
Handbook data - no method specified
GLP compliance:
no
Melting / freezing pt.:
825 °C
Decomposition:
yes
Decomp. temp.:
825 °C
Conclusions:
Calcium carbonate decomposes before melting. The decomposition temperature is 825 °C.
Endpoint:
melting point/freezing point
Type of information:
other: Handbook data
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Qualifier:
no guideline followed
Principles of method if other than guideline:
Handbook data - no method specified
GLP compliance:
no
Melting / freezing pt.:
825 °C
Remarks on result:
other: Calcium carbonate (aragonite)
Melting / freezing pt.:
1 330 °C
Remarks on result:
other: Calcium carbonate (calcite)
Conclusions:
The melting point of calcium carbonate as aragonite is 825 °C and as calcite is 1330 °C.
Endpoint:
melting point/freezing point
Type of information:
other: Handbook data
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Qualifier:
no guideline followed
Principles of method if other than guideline:
Handbook data - no method specified
GLP compliance:
no
Melting / freezing pt.:
825 °C
Atm. press.:
102.5 atm
Decomposition:
yes
Remarks:
- decomposes into CaO and CO2
Decomp. temp.:
825 °C
Remarks on result:
other: Calcium carbonate (aragonite)
Melting / freezing pt.:
1 339 °C
Atm. press.:
102.5 atm
Decomposition:
yes
Remarks:
- decomposes into CaO and CO2
Decomp. temp.:
825 °C
Remarks on result:
other: Calcium carbonate (calcite)
Conclusions:
The melting point of calcium carbonate as aragonite is 825 °C and as calcite is 1339 °C. At about 825 °C calcium carbonate decomposes into CaO and CO2.

Description of key information

Bulk calcium carbonate decomposes without melting at temperatures greater than 825 °C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
825 °C

Additional information

The value for melting point is based on a weight of evidence using data from several peer reviewed handbooks.