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Colloidal Silicas

Wesbond offers a complete line of Levasil® Colloidal Silica products, produced by Nouryon Pulp and Performance Chemicals, for a variety of fiber bonding applications. Wesbond manufactures Wesol P, a proprietary positively-charged colloidal silica.

Note that the former Bindzil products are now called Levasil. Same product, new name. Refer to the table below for grade equivalents.

Contact us for suggestions on how to use these materials in your fiber-bonding applications.


Product Usage Description TDS SDS

Levasil® FO1440

Fiber Bonding

Colloidal silica for bonding and rigidizing fibers.


Levasil® FO2040

Fiber Bonding

Larger particle colloidal silica.


Levasil® FX2040 N

Fiber Bonding

Ammonia-stabilized larger particle colloidal silica.


Megasol® S50

Fiber Bonding

Large particle size colloidal silica for optimum strength in bonding ceramic fibers.


Wesol P

Fiber Bonding

Alumina-coated colloidal silica positive sol for filters and hydrophilizing.


Colloidal Silica Property Comparisons

(Click header to sort)

Product Surface Charge Surface Area Particle Size (calc) PSD Stabilizing Ion Stabilizing Ion Level pH SG Concentration Viscosity
FO1440 Negative 250 11 Narrow Sodium 0.50 10.5 1.3 40% 19
FO2040 Negative 200 14 Narrow Sodium 0.38 10.0 1.3 40% 13
FX2040 N Negative 200 14 Narrow Ammonia 0.20 9.5 1.3 40% 17
Megasol S50 Negative 80 35 Broad Sodium 0.20 9.5 1.4 50% 17
Wesol P Positive 250 11 Narrow Chloride 1.20 4.0 1.2 30% 18



Colloidal Silica Grade Cross Reference

Our supplier of colloidal silica, Nouryon Pulp and Performance Chemicals, consolided their product lines in 2016 and rebranded their Bindzil products as Levasil. The products are exactly the same; only the name has changed.

Bindzil Grade Levasil Grade
1440 FO1440
2040  FO2040
 2040NH4 FX2040 N
 9950  FO9950
Megasol S50 Megasol S50


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