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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Environmental fate & pathways

Additional information on environmental fate and behaviour

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Administrative data

additional information on environmental fate and behaviour
Type of information:
other: Qaulitative statement
Adequacy of study:
other information
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Acceptable procedure and publication

Data source

No information
O'Connor TL (1961). The reaction rates of polysilicic acids|with molybdic acid. J. Phys. Chem. 65, 1-5.

Materials and methods

Principles of method if other than guideline:
Qualitative statement on extent of depolymerisation of commercial silicate solutions.

Test material

Constituent 1
Chemical structure
Reference substance name:
Silicic acid, potassium salt
EC Number:
EC Name:
Silicic acid, potassium salt
Cas Number:
Molecular formula:
K2O x (SiO2)n with Molar Ratio (MR) (SiO2/K2O): 0.5 – 5 (with exception of MR = 1)
potassium hydroxysilanoylolate

Results and discussion

Any other information on results incl. tables

Upon dilution of concentrated commercial silicate solutions with water, the highly cross-linked polysilicate ions
depolymerize rapidly to monosilicate ions, the extent of depolymerisation depending on the dilution factor.

Applicant's summary and conclusion