Registration Dossier

Physical & Chemical properties

Water solubility

Currently viewing:

Administrative data

Link to relevant study record(s)

Referenceopen allclose all

Endpoint:
water solubility
Type of information:
other: Handbook data
Adequacy of study:
other information
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: Handbook data
Principles of method if other than guideline:
Handbook data, no information on test details.

Soluble silicates are incompatible with most organic compounds.

Endpoint:
water solubility
Type of information:
other: Handbook data
Adequacy of study:
other information
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: Handbook data
Principles of method if other than guideline:
Handbook data, no information on test details.

Potassium silicate flake glass of molar ratio 3.9 dissolves readily in  water at ca. 88°C without pressure by incremental addition of

glass to water.

Endpoint:
water solubility
Type of information:
other: Brochure data
Adequacy of study:
other information
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: Manufacturers data without proof.
Guideline:
other: no data

Solid potassium silicate (lumps or ground glass) is practically insoluble in water at ambient temperature and pressure. Solutions containing up to 41% solids in water can be achieved  at elevated temperature and pressure. They are stable

at room temperature.

Endpoint:
water solubility
Type of information:
other: Handbook data
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Peer-reviewed handbook data.
Principles of method if other than guideline:
Handbook data, no information on test details.
GLP compliance:
not specified
Type of method:
other: Handbook data
Key result
Remarks on result:
other: see Remarks
Remarks:
Potassium silicate is very slowly soluble in cold water or, depending on the composition, almost insoluble. More readily soluble in water when heated with it under pressure.

Potassium silicate is very slowly soluble in cold water or, depending on  the composition, almost insoluble. 

More readily soluble in water when  heated with it under pressure.

Endpoint:
water solubility
Type of information:
other: Brochure data
Adequacy of study:
weight of evidence
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: Product brochure of producers association; data without proof.
Principles of method if other than guideline:
Brochure data; no further details
GLP compliance:
no
Type of method:
other: Brochure data
Remarks on result:
other: see Remarks
Remarks:
Alkaline silicates are completely insoluble in n-octanol. The pH in alkaline silicates is dependant on the silica to alkali ratio and the concentrations of the individual solutions. Concentrated solutions usually have a pH between 10 and 13.

Alkaline silicates are completely insoluble in n-octanol. The pH in alkaline silicates is dependant on the silica to alkali ratio and the concentrations of the individual solutions. Concentrated solutions usually have a pH between 10 and 13.

Endpoint:
water solubility
Type of information:
other: Handbook data
Adequacy of study:
weight of evidence
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: Handbook data
Principles of method if other than guideline:
Handbook data, no information on test details.
GLP compliance:
not specified
Type of method:
other: Handbook data
Remarks on result:
other: see Remarks
Remarks:
Powders obtained by water evaporation from solutions are readily soluble in water at room temperature due to their residual water content of about  20%.

Powders obtained by water evaporation from solutions are readily soluble  in water at room temperature due to their residual water content of about  20%.

Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Well-documented scientific publication.
Principles of method if other than guideline:
Concentration measured colorimetrically using molybdenum blue method.
GLP compliance:
no
Type of method:
other: colorimetry
Water solubility:
115 mg/L
Temp.:
25 °C
pH:
7
Remarks on result:
other: see Remarks
Remarks:
Neutral pH is indicated as pH = 7.0

Amorphous silica which precipitates when alkaline silicate solutions are neutralized has a water solubility of 115 mg/l at 25°C and

neutral pH.

Description of key information

Anhydrous solid dissolves extremely slowly at ambient conditions.
Spray-dried solutions readily dissolve in water.
Solutions are infinitely miscible with water.

Key value for chemical safety assessment

Additional information

Determination of quantitative water solubilities is not feasible. Aqueous solutions are characterised by a dynamic polymerisation/hydrolysis equilibrium of monomeric SiO2(aq.), oligomeric silicate ions and polysilicate ions which is strongly pH-dependent.