Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties


Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

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.

Key value for chemical safety assessment

non flammable

Additional information

Justification for classification or non-classification

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.