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EC number: 231-130-8
CAS number: 7440-21-3
If elemental silicon “metal” is released to the environment, any surfaces of the silicon particles are normally already oxidized or will be oxidized rapidly. The actual rate of the transformation process (oxidization) is highly dependent on particle size and environmental conditions. Silicon and the transformation product silica are non toxic substances in fresh water and marine sediments. Hazardous impurities may be present in small quantities.
Silicon and silica are expected to be non toxic substances in
fresh water and marine sediments. Sediment testing of (> 95-100 % pure)
silicon is therefore not seen important and necessary according to the
Chemical Safety Assessment. This conclusion is made based on the
available information of effects and composition of the registered
All known/reported hazardous impurities (e.g. Pb) are present at
0.1% maximum level ((as presented under 1.2 the substance Composition).
However, it must be pointed out, that even if the levels of impurities
may be low, these > 95% silicon materials might still have some toxic
response in sediment living (benthic) species if tested in high
concentrations or as such as an artificial sediment.
Companies should have regular control over the levels of hazardous
impurities and update the chemical safety assessment and risk management
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.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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