LUDOX® AS-40 is an alkaline 40% aqueous dispersion of colloidal silica with a particle size of 22 nm. It is stabilized with ammonium and used as a high temp binder and catalyst in a wide range of industrial applications.
LUDOX® colloidal silica products are water dispersions of amorphous silica particles. They are typically used as binders, surface modifiers, and flocculants, especially when high thermal stability is required.
LUDOX® AS-40 is an excellent binder for high-temperature applications such as vacuum formed fibrous shapes. It is also used in catalyst applications such as zeolites and emission control products. LUDOX® AS-40 is preferred where the presence of sodium is detrimental.
Chemistry: Colloidal Silica
Silica Content: 39-41%
Specific Surface Area: 135 m2/g
pH: 9.1
Specific Gravity: 1.30 (@25°C)
Viscosity: 11 cP (@25°C)
Particle Charge: Negative
Stabilizing Counter Ion: Ammonium
Primary Chemistry: Colloidal Silica
Anionic Particles
Excellent surface modification
Outstanding formulation stability
Suitable for high temperature applications
High binder performance
Small particle size
Ammonium stabilized
Stabilized against gelation
Non-porous and uniformed
Instability of binders in extremely high temperature applications.
Failure of binding material caused by sodium.
Poor cohesive strength of ceramic and refractory materials.
Paper and film coatings
Industrial water-based coatings
Latex coatings
Electrical steel inorganic coatings
Catalyst formulations
Molecular sieves
Vacuum formed refractories
LUDOX® Colloidal Silica is used in a wide range of processes to improve the and resiliency of building materials. Formulating LUDOX™ into concrete, coatings, adhesives, and sealants increases productivity and reduces cost while boosting the strength and consistency of the end product.
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