Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Silicon is inorganic substance and element which may undergo transformation processes in the environment. The speciation of the substance may be different if the environmental conditions change. Abiotic (non-biological) transformation of silicon can typically occur by physico-chemical processes such as oxidation and hydrolysis.

A thin layer of amorphous silicon dioxide (SiO2) is formed on the surface of silicon exposed to air, even at ambient temperatures. The surface composition of high grade silicon (Si 99.1 wt%) consists of oxidized silicon. The oxidised layer on the surface passivates silicon and makes handling of silicon safer. Non passivated silicon powder is highly reactive.