Levasil®FX2040 N
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
Color
Clear
Consistency
Slightly viscous liquid
Specific Gravity
1.3
Surface Area, m2/g
200 average
Particle Size, nm
14 (calculated)
Silica, wt%
40
NH4, wt%
0.20
pH @ 25oC
9.5
Viscosity @ 25oC, cp
17
Toxicity
Non-toxic. Slightly alkaline. Avoid skin and eye contact. Refer to SDS for complete safety information.
Packaging
Bulk tanks, 4000 gal; totes, 275 gal. ;drums, 55 gal; pails, 5 gal.




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