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Physical & Chemical properties

Viscosity

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Endpoint:
viscosity
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:
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:
>= 25 - <= 100 000

RM-Freetext:
In addition to the temperature, the viscosity of a sodium silicate  solution depends to a large degree on the concentration and the molar  ratio SiO2/Na2O.

For typical commercial silicate solutions the following viscosities are  observed:

Solids content    Molar ratio       Viscosity 
      %            SiO2/Na2O      mPa.s at 20°C
-------------------------------------------------
    28.1             3.97               25
    34.4             3.40               45
    34.9             3.46               80
    36.4             3.44              180
    38.0             3.42              550
    41.4             3.17             1100
    43.3             2.69              400
    45.0             2.84             2000
    47.0             2.48             1750
    54.5             2.09      ca. 100000

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
Guideline:
other: no data
Key result
Temp.:
20°C
Parameter:
dynamic viscosity (in mPa s)
Value:
>= 20 - <= 500

RM-Freetext:
In addition to the temperature, the viscosity of a sodium silicate  solution depends to a large degree on the concentration and the molar  ratio SiO2/Na2O.

Viscosities reported for typical commercial silicate solutions:

Total solids      Molar ratio       Viscosity 
    wt %           SiO2/Na2O      mPa.s at 20°C
-------------------------------------------------
    28.0             3.97               20
    38.1             3.41            250-500
    42.1             2.06              200
    43.6             2.58              400

Description of key information

Not applicable for solids.

Key value for chemical safety assessment

Additional information

The test substance is a solid material.

The aqueous solutions (of different concentrations, and with different Na2O / SiO2 molar ratios) indicate to have a dynamic viscosity of 20 - 100000 mPa * s, at 20 °C.