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LUDOX® HS-40 contains synthetic amorphous silica of nominal 12 nanometer particle size. The alkaline aqueous colloidal dispersion contains 40% silica.
Product Specifications
Property
Unit
Specification
Test Method
Specific Gravity @ 60¡ãF
1.292 ¨C1.312
L6550.310.02.EC
Silicon Dioxide
%SiO2
39.0 ¨C 41.0
L6550.083.01.EC
pH @25¡ãC/77¡ãF
9.2 ¨C 9.9
L6550.280.01.EC
Ratio SiO2/Na2O
89 ¨C 101
L6550.043.01.EC
% Transmission
%
52 Min
P5900.523.01.EC
Viscosity @ 25¡ãC
cPs
45 Max
L6550.545.01.EC
Sulfate
%Na2SO4
0.08 Max
L6550.277.01.EC
Surface Area
m2/g
198 ¨C 258
L6550.005.02.EC
Alkalinity
%Na2O
0.39 ¨C 0.46
L6550.005.01.EC
The following Typical Properties data are given for informational purposes only, and are not to be interpreted as product or in-process specifications.
Typical Properties
Property
Unit
Typical Value
Density
kg/L, lb/gal
1.3, 10.8
Boiling Point @760mm Hg
¡ãC/¡ãF
100/212
Melting Point
¡ãC/¡ãF
0/32
Vapor Pressure @25¡ãC/77¡ãF
mm Hg
24
@ 38¡ãC/100¡ãF
mm Hg
48
Stabilizing Counter Ion
Sodium
Particle Charge
Negative
Biocide
ppm
240
Recommended Applications
LUDOX® HS-40 colloidal silica is broadly used in the formulation of coatings, catalysts, antislips and antisoil treatments as well as a high temperature binder for refractory fibers, investment castings, etc.
Key features are:
• High binding strength and stability in most applications
• Highest silica content for this particle size
4Â¥2012-04-13 17:28:40
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