Registration Dossier
Registration Dossier
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EC number: 304-802-4 | CAS number: 94279-56-8
Endpoint summary
Administrative data
Description of key information
Additional information
The substance reacts with water. The water soluble reaction product is a multi-constituent substance: Reaction mass of disodium metasilicate and sodium hydroxide(EC 910-245-3).
Disodium Metasilicate: An LC50 of 210 mg/L for freshwater Brachydanio rerio (new name: Danio rerio) and an LC50 of 2320 mg/L for freshwater for Gambusia affinis.
Sodium Hydroxide: The available data indicate that NaOH concentrations of 20 to 40 mg/l may be acutely toxic to fish and invertebrates.
The residual insoluble Zirconium salts: LC50 >100 mg/L
Therefore, it is the sodium hydroxide formed when the substance that reacts with water that is the most toxic. Therefore, these data are used for the chemical safety assessment after correction for composition of a maximum of 50% sodium hydroxide equivalence (after reaction with water). Therefore a sodium hydroxide LC50 of 20 mg/L equates to 40 mg/L for the substance.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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