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EC number: 231-130-8
CAS number: 7440-21-3
In the flammability test according to the UN guideline, fine crystalline silicon powder (<10 µm) could be ignited and propagated flame. Burning time of 250 mm ridge was 50 min. Powder consisting of particles in the size range up to 40 µm could be ignited but was extinguished. Powders consisting of particles in the size range up to 75 or 150 µm could not be ignited. In the flammability test according to the EC guideline, microcystalline silicon powder (0.2 - 8 µm) could not be ignited.
The slow burning rate (burning time 50 min for powder in the size range
of <10 um) observed in the flammability test does not entitle
classification of crystalline silicon powders as "flammable solid"
according to CLP regulation.
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