Registration Dossier
Registration Dossier
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EC number: 231-554-3 | CAS number: 7631-99-4
Melting point / freezing point
Administrative data
Link to relevant study record(s)
- 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
- Remarks:
- Handbook data are considered from a trusted source. Data have been taken from many sources, including both compilations and the primary literature - where conflicts were found, the value deemed most reliable was chosen. The reference was peer-reviewed. In addition, the reference sources are indicated although not leading to sufficient information on the material & method used.
- Guideline:
- other: not mentioned
- Principles of method if other than guideline:
- Method followed unknown; data from handbook.
- GLP compliance:
- not specified
- Melting / freezing pt.:
- 307 °C
- Melting / freezing pt.:
- 580 K
- Conclusions:
- The CRC Handbook of Chemistry and Physics (80th ed.) mentions a melting temperature of 307°C for sodium nitrate.
- Endpoint:
- melting point/freezing point
- Type of information:
- other: handbook
- Adequacy of study:
- weight of evidence
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- documentation insufficient for assessment
- Remarks:
- The preface and introduction to this book (9th Edition) provide no indication that the physico-chemical data has been ‘peer reviewed’. The reference source is not indicated leading to insufficient information on the material & method used.
- Guideline:
- other: not mentioned
- Principles of method if other than guideline:
- Method followed unknown; data from handbook.
- GLP compliance:
- not specified
- Melting / freezing pt.:
- 306.8 °C
- Decomposition:
- yes
- Decomp. temp.:
- 380 °C
- Melting / freezing pt.:
- 580 K
- Decomposition:
- yes
- Decomp. temp.:
- 653 K
- Conclusions:
- Sax's Dangerous Properties of Industrial Materials (9th. ed.) mentions a melting temperature of 306.8°C for sodium nitrate.
- 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
- Remarks:
- Handbook data are considered from a trusted source. Data have been taken from many sources, including both compilations and the primary literature - where conflicts were found, the value deemed most reliable was chosen. The reference was peer-reviewed. In addition, the reference sources are indicated although not leading to sufficient information on the material & method used.
- Guideline:
- other: not mentioned
- Principles of method if other than guideline:
- Method followed unknown, data from handbook
- GLP compliance:
- not specified
- Melting / freezing pt.:
- 308 °C
- Melting / freezing pt.:
- 581 K
- Conclusions:
- The Merck Index (12th ed.) mentions a melting temperature of 308°C for sodium nitrate.
Referenceopen allclose all
The handbook mentions decomposition at 380°C. However, experience in handling (e.g prilling process) indicates that decomposition takes place at higher temperatures. The first thermal decomposition process for sodium nitrate is observed over 550°C (KH Stern, see additional physico-chemical properties).
Description of key information
Combining three handbooks, the melting point of sodium nitrate is 307°C.
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- 307 °C
Additional information
The handbooks used:
-The CRC Handbook of Chemistry and Physics (80th ed.)
-The Merck Index (12th ed.)
-Sax's Dangerous Properties of Industrial Materials (9th. ed.)
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