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EC number: 231-130-8
CAS number: 7440-21-3
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
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.
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