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EC number: 247-852-1 | CAS number: 26628-22-8
Melting point / freezing point
Administrative data
Link to relevant study record(s)
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2010-01-06
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- guideline study without detailed documentation
- Qualifier:
- according to guideline
- Guideline:
- other: ASTM E 537 76
- Deviations:
- not specified
- GLP compliance:
- no
- Type of method:
- differential scanning calorimetry
- Specific details on test material used for the study:
- Chemical Name: sodium azide, NaN3
CAS No.: 26628-22-8
Molar mass: 65.01 g/mol
Molecular formula: N3Na
Physical state: solid
Purity: 99.3%
Bulk density: 0.86 g/ml
Origin of the sample(s): Island Veer Chemie Private Ltd.
Lot. No. of vendor: SA0801149
Raw material code: R1024
Lot No.: R1024-0077 - Key result
- Decomposition:
- yes
- Decomp. temp.:
- >= 370 - <= 425 °C
- Conclusions:
- No melting point could be observed. The substance decomposes between 370 °C and 425 °C.
- Executive summary:
The thermal behaviour of the test item sodium azide was investigated by Differential Scanning Calorimetry according to ASTM E 537-76. Between 370 °C and 425 °C the substance decomposes with an exothermic energy of 758 J/g. The onset temperature of this exothermic reaction is 378 °C and the maximum heat flow of 5 W/g was reached at 396 °C. No melting point could be observed.
Reference
Between 370 °C and 425 °C the substance decomposes with an exothermic energy of 758 J/g. The onset temperature of this exothermic reaction is 378 °C and the maximum heat flow of 5 W/g was reached at 396 °C. No melting point could be observed.
Description of key information
The thermal behaviour of the test item sodium azide was investigated by differential scanning calorimetry according to ASTM E 537-76. Between 370 °C and 425 °C the substance decomposes with an exothermic energy of 758 J/g.
The onset temperature of this exothermic reaction is 378 °C and the maximum heat flow of 5 W/g was reached at 396 °C. No melting point could be observed.
Key value for chemical safety assessment
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