|Larger particle size colloidal silica|
|Levasil® FO2040 is a larger particle (~14nm) colloidal silica that gives better refractory fiber composites. Extensive pilot plant studies show it gives stronger vacuum formed boards and shapes with better high temperature properties than the smaller particle silica sols. Levasil® FO2040 is a colloidal dispersion in water of 14 nanometer amorphous silica spheres at an economical 40% concentration. It is also available at 50% concentration as Levasil® 2050.|
|Stronger Bonding and Hardness —||Larger particle
size yields higher green strengths (i.e., modulus of rupture) and harder
refractory fiber shapes.
|Better High Temperature Properties —||Larger particle
size and lower sodium content gives lower shrinkage at temperatures up to
|Saves Money —||Balanced silica
to starch floccing ratio is more economical giving high strength with less
colloidal silica in formulation.
|Rigidizes Better —||Larger particles
soak in further and giver stronger, harder rigidized products; lower sodium
results in less shrinkage at end-use temperatures.
|Flocs with Cationic Starch —||Negative surface
charge flocs cationic starch refractory fibers together to form a three
dimensional floc for good product strength.
Typical Physical Properties
|Consistency||Slightly viscous liquid|
|Specific Surface Area, m2/g||200|
|Particle Size, nm||14 (calculated)|
|pH @ 25°C||10.0|
|Viscosity @ 25°C, cp||13|
|Toxicity||Non-toxic. See SDS.|
|Packaging||Bulk tanks, 4000 gal; totes, 275 gal. ;drums, 55 gal; pails, 5 gal.|
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