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Levasil® FO1440
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.

Levasil® FO1440 offers these advantages

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 sols.

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

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Color Clear
Consistency Slightly viscous liquid
Specific Gravity 1.3
Specific Surface Area, m2/g 250
Particle Size, nm 11 (calculated)
Silica, wt% 40
Na2O, wt% 0.50
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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