Registration Dossier
Registration Dossier
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EC number: 273-761-1 | CAS number: 69012-64-2 Amorphous silicon dioxide particles from the volatilization and vaporization of furnace feed materials in the manufacture of ferrosilicon and silicon.
Endpoint summary
Administrative data
Description of key information
Additional information
Silica fume may be taken up by living species. Silicic acid is known to be the major bioavailable form for aquatic organisms and it plays an important role in the biogeochemical cycle of Si. Most living organisms contain at least trace quantities of silicon. For some species, Si is an essential element that is taken up actively, while for others Si is not essential but still taken passively and need to be excreted out (or passivated one way or another). Many species, like diatom algae, radiolarians, flagellates, sponges and gastropods have silicate skeletal structures.
Silica is ubiquitous in the aquatic and terrestrial environments. Measured silicon concentration values in the biota are available for a variety of systems. These observations have shown no tendency, or a low intrinsic tendency, for undissolved or dissolved silica to bioaccumulate in aquatic or terrestrial species if silicon is not taken up actively. Sufficient evidence exists to show that the bioaccumulation of silica is not an environmental concern and no further bioaccumulation studies are needed for silica fume.
Organic impurities and heavy metal impurities which may be present in silica fume at trace levels may be bioaccumulative. These contaminants must be dealt separately and evaluate on the case by case basis. Companies should have regular control over the levels of hazardous impurities.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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