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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Toxicity to aquatic algae and cyanobacteria

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Administrative data

Link to relevant study record(s)

Description of key information

Calcium silicate showed a weak inhibitory effect on algal growth with EL10 values < 100 mg/L, and with EL50  >>100 mg/L.

Key value for chemical safety assessment

EC10 or NOEC for freshwater algae:
41 mg/L

Additional information

Aqueous extracts obtained from a calcium silicate produced weak inhibition of algal growth: EL10 = 33 and 41 mg/L for biomass production and growth rate, respectively, corresponding EL50 values ranged from 410 to >1000 mg/L. On the other hand, a structure-analogous sodium aluminum silicate did not show any toxicity: EL50 > 10,000 mg/L, NOELR = 10,000 mg/L (data not shown).

No significant toxicity towards algae - including the marine environment - is expected from exposure to synthetic amorphous calcium silicate (CS).