Levasil®FO9950
Very large particle size colloidal silica
Levasil® FO9950 is a very large particle size (~100nm), low-sodium colloidal silica that is used in ceramic fiber insulation, frictionizing applications, and abrasives. Levasil® FO9950 is a colloidal dispersion in water of amorphous silica spheres at an economical 50% concentration. 

Levasil® FO9950 offers these advantages

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 2300oF.
Forms 3D gels
Can be gelled with Wesol D30 colloidal alumina and refractory fibers to form thick fibrous coatings. 
Rigidizes Better
Larger particles soak in farther and giver stronger, harder rigidized products.
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 and Consistency
White slightly viscous liquid
Consistency
Slightly viscous liquid
Specific Gravity
1.4
Surface Area, m2/g
80 average
Particle Size, nm
35 (calculated)
Silica, wt%
40
Na2O, wt%
0.10
pH @ 25oC
9.0
Viscosity @ 25oC, cp
15
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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