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Diss Factsheets

Physical & Chemical properties

Melting point / freezing point

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Administrative data

Link to relevant study record(s)

Referenceopen allclose all

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:
other: see 'Remark'
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
Decomposition:
yes
Decomp. temp.:
210 °C
Decomposition:
yes
Decomp. temp.:
483 K
Conclusions:
The CRC Handbook of Chemistry and Physics (80th ed.) mentions decomposition of ammonium nitrate at 210°C. No melting temperature.
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:
other: 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.:
169.6 °C
Decomposition:
yes
Decomp. temp.:
210 °C
Melting / freezing pt.:
442.8 K
Decomposition:
yes
Decomp. temp.:
483 K
Conclusions:
Sax's Dangerous Properties of Industrial Materials (9th. ed.) mentions a melting temperature of 169.6°C for ammonium nitrate and decomposition at 210°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:
other: see 'Remark'
Remarks:
The following information was generated from the Hazardous Substances Data Bank (HSDB), a database of the National Library of Medicine's TOXNET system (http://toxnet.nlm.nih.gov) on February 11th 2010. The reference source is indicated although not leading to sufficient information on the material & method used. The reference was a peer-reviewed handbook. Handbook data are considered from a trusted source.
Guideline:
other: not mentioned
Principles of method if other than guideline:
Method followed unknown; data from handbook.
GLP compliance:
not specified
Melting / freezing pt.:
169.7 °C
Melting / freezing pt.:
442.9 K
Conclusions:
The CRC Handbook of Chemistry and Physics (86th ed.) mentions a melting temperature of 169.7°C for ammonium 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:
other: see 'Remark'
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
Decomposition:
yes
Decomp. temp.:
ca. 210 °C
Remarks on result:
other: mostly into H2O and N2O
Decomposition:
yes
Decomp. temp.:
ca. 483 K
Conclusions:
The Merck Index (12th ed.) mentions decomposition at about 210°C for ammonium nitrate. No melting temperature.

Description of key information

Combining four handbook results, the melting point of ammonium nitrate is 169.6 -169.7°C and decomposition starts at 210°C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
169.6 °C

Additional information

Handbooks used:

-The Merck Index (12th ed.)

-The CRC Handbook of Chemistry and Physics (86th ed.)

-The CRC Handbook of Chemistry and Physics (80th ed.) and The Merck Index (12th ed.)

-Sax's Dangerous Properties of Industrial Materials (9th. ed.)