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Reference
Endpoint:
relative self-ignition temperature (solids)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2010-01-12
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study without detailed documentation
Qualifier:
according to guideline
Guideline:
EU Method A.16 (Relative Self-Ignition Temperature for Solids)
Deviations:
yes
Remarks:
: cylindrical instead of cubic test container
GLP compliance:
no
Relative self-ignition temperature:
309 °C
Remarks on result:
other:
Remarks:
Test pressure not reported in study report.

The self-ignition temperature of Sodium azide was determined according to EU Method A.16. The report deviates from the guideline, as a cylindrical instead of a cubical test container was used; the volume was equal to that stated in the guideline. The oven was heated at 0.5 K/min.

One sample showed an exothermic reaction with a maximum temperature of 411°C at an oven temperature of 309°C. The other sample showed an exothermic reaction with a maximum temperature of 630°C at an oven temperature of 340°C.

Using a conservative approach, the lower value of the two experiments was used and the self-ignition temperature was therefore 309°C.

Conclusions:
The self-ignition temperature of Sodium azide was tested in two measurements according to the EU Method A.16. The self-ignition temperatures in the two measurements were 309°C and 340°C. Using a conservative approach, the lower value of the two measurements is used and therefore the self-ignition temperature of sodium azide is 309°C.
Executive summary:

The self-ignition temperature of Sodium azide was determined according to EU Method A.16. The report deviates from the guideline, as a cylindrical instead of a cubical test container was used; the volume was equal to that stated in the guideline. The oven was heated at 0.5 K/min.

One sample showed an exothermic reaction with a maximum temperature of 411°C at an oven temperature of 309°C. The other sample showed an exothermic reaction with a maximum temperature of 630°C at an oven temperature of 340°C.

Using a conservative approach, the lower value of the two experiments was used and the self-ignition temperature was therefore 309°C.

Description of key information

The self-ignition temperature of sodium azide was determined according to EU Method A.16. The report deviates from the guideline, as a cylindrical instead of a cubical test container was used; the volume was equal to that stated in the guideline. The oven was heated at 0.5 K/min.

One sample showed an exothermic reaction with a maximum temperature of 411°C at an oven temperature of 309°C. The other sample showed an exothermic reaction with a maximum temperature of 630°C at an oven temperature of 340°C.

Using a conservative approach, the lower value of the two experiments was used and the self-ignition temperature was therefore 309°C.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:
309 °C

Additional information