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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Static studies were conducted with Leuciscus idus and Daphnia magna by Richterich and Muehlberg (2001). The 48 h LC50 and 24 h EC50 were both determined to be > 146 mg/L.

No algae and microorganism studies are available on potassium silicate. Data are read-across to sodium silicate. A 72 h EC50 (biomass) in a test with Scenedesmus subspicatus was determined to be 207 mg/L. The EC50 for growth rate was > 345.4 mg/L, the highest concentration tested. In a growth inhibition test using the bacterium Pseudomonas putida the 18 h toxicity threshold (EC10, 10 % inhibition) of a neutralised silicate solution of pH 7.6 - 7.8 was > 3480 mg/L, the highest concentration tested, while for the unneutralised solution (pH 7.9 - 10.4) effects were found at concentrations above 348 mg/L. In a further study the toxicity to Pseudomonas putida was tested in an oxygen consumption inhibition test. Concentrations of a sodium silicate solution (MR 3.0, 34.54 wt%) of up to 3454 mg/L at pH 8.0 - 11.1 did not cause toxic effects.