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Ammonia stabilized larger particle colloidal silica
LEVASIL® FX2040 N is an ammonia-stabilized larger particle colloidal silica with very low sodium designed for high temperature, premium product applications where sodium alkali is detrimental. It is especially suited for saturation bonding and rigidizing (post impregnation) of specialty vacuum-formed fibrous refractories. LEVASIL® FX2040 N is a 40% concentration silica sol of 14 nanometer diameter amorphous spheres.

LEVASIL® FX2040 N offers these advantages

Better High Temperature Properties - Ammonia stabilized particles give stable bonds at high temperatures producing less shrinkage and less cristobalite at temperatures up to 2300oF.
Best Product for Rigidizing - Larger particles soak in further and giver stronger, harder rigidized products; significantly reduced sodium results in less shrinkage at end-use temperatures.
Stronger Bonding and Hardness - Larger particle size yields higher green strengths (i.e., modulus of rupture) and harder refractory fiber shapes.
Saves Money - Balanced silica to starch floccing ratio is more economical giving high strength with less colloidal silica in formulation. 
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

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Color Clear
Consistency Slightly viscous liquid
Specific Gravity 1.30
Specific Surface Area, m2/g 200
Particle Size, nm 14 (calculated)
Silica, wt% 40
NH4, wt% 0.20
pH @ 25oC 10.0
Viscosity @ 25oC, 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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