Sodium nitrate

Melting point / freezing point

Link to relevant study record(s)

Reference

Reference 1

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.

Reference 2

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

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).

Conclusions:

Sax's Dangerous Properties of Industrial Materials (9th. ed.) mentions a melting temperature of 306.8°C for sodium nitrate.

Reference 3

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.

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.)