Silicic acid, potassium salt

Viscosity

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

viscosity

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

other:

Reference 2

Endpoint:

viscosity

Type of information:

other: Secondary data from review article

Adequacy of study:

other information

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Collection of data

Guideline:

other: no data

Key result

Temp.:

20°C

Parameter:

dynamic viscosity (in mPa s)

Value:

>= 50 - <= 280

In addition to the temperature, the viscosity of a potassium silicate  solution depends to a large degree on the concentration and the molar  ratio SiO2/K2O.

For typical commercial silicate solutions the following viscosities are  observed:

Solids content    Molar ratio       Viscosity 
      %            SiO2/K2O       mPa.s at 20°C
-------------------------------------------------
    29.1             4.06               50
    34.4             3.46               45
    39.5             3.28              950 (at 25°C)
    40.5             3.14              280
    41.1             2.87               45

Reference 3

Endpoint:

viscosity

Type of information:

other: Handbook data

Adequacy of study:

other information

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Handbook data

Principles of method if other than guideline:

Handbook data, no information on test details.

Key result

Temp.:

20°C

Parameter:

dynamic viscosity (in mPa s)

Value:

>= 30 - <= 200

RM-Freetext:
In addition to the temperature, the viscosity of a potassium silicate  solution depends to a large degree on the concentration and the molar  ratio SiO2/K2O.

Viscosities reported for typical commercial silicate solutions:

Total solids      Molar ratio       Viscosity 
    wt %           SiO2/K2O       mPa.s at 20°C
-------------------------------------------------
    29.9             3.89              180
    34.8             3.21               30
    52.4             2.24              200

Description of key information

Not applicable for solids.

Additional information

The test substance is a solid material.

The aqueous solutions (of different concentrations, and with different K2O / SiO2 molar ratios) indicate to have a dynamic viscosity of 30 - 280 mPa * s, at 20 °C.

At 25 °C a dynamic viscosity of 950 mPa * s was determined for an aqueous solution with MR = 3.28.