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Physical & Chemical properties

Melting point / freezing point

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Endpoint:
melting point/freezing point
Type of information:
other: database
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
Remarks:
Data for superphosphate, taken from OECD HPV Chemical Programme, SIDS Dossier. Data obtained from International Uniform Chemical Information Database.
Guideline:
other: no information
Principles of method if other than guideline:
Method followed unknown.
GLP compliance:
not specified
Key result
Melting / freezing pt.:
110 °C
Conclusions:
International Uniform Chemical Information Database mentioned a melting temperature of 110°C for superphosphate, concd.
Endpoint:
melting point/freezing point
Type of information:
other: handbook
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Guideline:
other: no information
Principles of method if other than guideline:
Method followed unknown.
GLP compliance:
not specified
Key result
Decomposition:
yes
Decomp. temp.:
200 °C
Sublimation:
no
Remarks on result:
other: Loses of water at 100 °C . The handbook did not mention a melting temperature.
Conclusions:
The Merck Index indicated that Ca(H2PO4)2.H2O loses water at 100°C and decomposes at 200°C.
Endpoint:
melting point/freezing point
Type of information:
other: handbook
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Guideline:
other: no information
Principles of method if other than guideline:
Method followed unknown.
GLP compliance:
not specified
Key result
Decomposition:
yes
Decomp. temp.:
100 °C
Remarks on result:
other: The handbook did not mention a melting temperature.
Conclusions:
The CRC Handbook of Chemistry and Physics reported decomposition at 100°C for Ca(H2PO4)2.H2O.

Endpoint:
melting point/freezing point
Type of information:
other: handbook
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Guideline:
other: no information
Principles of method if other than guideline:
Method followed unknown.
GLP compliance:
not specified
Key result
Melting / freezing pt.:
1 460 °C
Remarks on result:
other: CaSO4
Decomposition:
yes
Decomp. temp.:
150 °C
Remarks on result:
other: CaSO4.2H2O
Conclusions:
The CRC Handbook of Chemistry and Physics reported decomposition at 150°C for CaSO4.2H2O and melting at 1460°C for CaSO4 anhydrous.


Description of key information

Based on data from handbook and/or data base for calcium sulfate and calcium phosphates, it was concluded that Superphosphates has no melting point but started to decompose at 100°C.

Key value for chemical safety assessment

Additional information

The Merck Index indicated that Ca(H2PO4)2.H2O loses water at 100°C and decomposes at 200°C.

The CRC Handbook of Chemistry and Physics reported decomposition at 100°C for Ca(H2PO4)2.H2O.

The CRC Handbook of Chemistry and Physics reported decomposition at 150°C for CaSO4.2H2O and melting at 1460°C for CaSO4 anhydrous.

International Uniform Chemical Information Database mentioned a melting temperature of 110°C for superphosphate, concd.