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Reference
Endpoint:
flammable solids
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2010-01-13
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study without detailed documentation
Qualifier:
according to guideline
Guideline:
EU Method A.10 (Flammability (Solids))
Deviations:
no
GLP compliance:
no
Test procedure:
burning rate test: preliminary screening test
Remarks on result:
other: The substance cannot be ignited by ferrocerium sparks. A match or the hot flame of a small gas burner is capable to ignite the substance. After ignition it burns unsteadily with a small yellow flame, white fume, and partially sparkling.
Test procedure:
other: Burning rate test over 200 mm length
Burning time:
600 s
Remarks on result:
other: The pile was ignited at one end with a hot flame of a small gas burner within 15 seconds. After ignition the substance burns slowly, partially incomplete, and with some sparkling.

PRELIMINARY SCREENNG TEST:

The substance cannot be ignited by ferrocerium sparks. A match or the hot flame of a small gas burner is capable to ignite the substance. After ignition it burns unsteadily with a small yellow flame, white fume, and partially sparkling.

BURNING RATE TEST:

The pile was ignited at one end with a hot flame of a small gas burner within 15 seconds. After ignition the substance burns slowly, partially incomplete, and with some sparkling. For a length of 200 mm a burning time of 10 min was measured.

The substance has not to be considered as a flammable solid.

Interpretation of results:
other: The test item sodium azide is not considered as flammable solid.
Conclusions:
Sodium azide can be ignited with a match or a gas burner flame. In the main test, the burning time for a 200 mm pile was 10 minutes. According to the test guideline, a substance can be considered as not flammable, if the burning time exceeds 4 minutes for a 200 mm distance. Moreover, no further testing is then required.
Executive summary:

The flammability of Sodium azide was tested according to EU method A.10 (Flammability (solids)). This comprises a preliminary test in which the test substance is tried to be ignited by spark or flame, and a main test, in which a defined pile of the test substance (250 x 20 x 10 mm, triangular profile) is ignited at the one end and the burning rate over a 200 mm distance is measured.

Sodium azide could be ignited by use of a gas burner flame or a match, but not by a ferrocerium spark.

The burning time for a 200 mm distance of Sodium azide was measured to be 10 minutes. According to the test guideline, a substance can be considered as not flammable, if the burning time exceeds 4 minutes for a 200 mm distance, which is the case for Sodium azide.

Description of key information

The flammability of sodium azide was tested according to EU method A.10 (Flammability (solids)). This comprises a preliminary test in which the test substance is tried to be ignited by spark or flame and a main test, in which a defined pile of the test substance (250 x 20 x 10 mm, triangular profile) is ignited at the one end and the burning rate over a 200 mm distance is measured.

Sodium azide could be ignited by use of a gas burner flame or a match, but not by a ferrocerium spark.

The burning time for a 200 mm distance of sodium azide was measured to be 10 minutes. According to the test guideline, a substance can be considered as not flammable, if the burning time exceeds 4 minutes for a 200 mm distance, which is the case for sodium azide.

Key value for chemical safety assessment

Flammability:
not classified

Additional information

Justification for classification or non-classification

The burning time for a 200 mm distance of sodium azide was measured to be 10 minutes. According to the test guideline, a substance can be considered as not flammable, if the burning time exceeds 4 minutes for a 200 mm distance, which is the case for sodium azide.