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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Diss Factsheets

Ecotoxicological information

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.