|Colloidal silica for bonding and rigidizing fibers|
|Levasil® FO1440 is the most commonly used colloidal silica for bonding refractory fibers and rigidizing refractory fiber shapes and boards. Levasil® FO1440 is an economical 40% concentration silica sol of 14 nanometer diameter amorphous silica spheres. The particles carry a slightly negative surface charge with a high surface area to weight ratio for good floccing with Westar+ and Westar+3 cationic starch.|
|Good High Temperature Bonds —||Colloidal silica
bonds withstand temperatures up to 2300oF with low shrinkage.
|Saves Money —||Economical 40%
concentration reduces freight and package costs over lower concentration
|Flocs with Cationic Starch —||Negative surface
charge flocs cationic starch refractory fibers together to form a three
dimensional floc for good product strength.
|Rigidizes Effectively —||Can be used diluted
or full strength for sealing or rigidizing of fiber-bonded shapes.
|Typical Physical Properties|
|Consistency||Slightly viscous liquid|
|Specific Surface Area, m2/g||250|
|Particle Size, nm||11 (calculated)|
|pH @ 25°C||10.4|
|Viscosity @ 25°C, cp||15|
|Toxicity||Non-toxic. See SDS.|
|Packaging||Bulk tanks, 4000 gal; totes, 275 gal. ;drums, 55 gal; pails, 5 gal.|
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