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Melting point / freezing point

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Reference
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
Decomposition:
yes
Decomp. temp.:
>= 370 - <= 425 °C

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.

Conclusions:
The thermal behaviour of the test item Sodium azide was investigated by Differential Scanning Calorimetrie 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.
Executive summary:

The thermal behaviour of the test item Sodium azide was investigated by Differential Scanning Calorimetrie 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.

Description of key information

The thermal behaviour of the test item Sodium azide was investigated by Differential Scanning Calorimetrie 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

Additional information