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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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Physical & Chemical properties

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The surface of ferrosilicon slag is composed of silicon, calcium, aluminium and magnesium rich oxide phases. No iron was detected on the surface. The thickness of the surface oxide layer is only few nanometres. Si-Slag was characterised as non-fibrous, or as mainly non-fibrous with a relatively small proportion of respirable fibres. Quartz and cristobalite content were < 0.3%. There were no bundles of asbestiform fibres present.

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