LUDOX® AS-40 is an alkaline, 40% solids aqueous dispersion of colloidal silica with a particle size of 22 nm. It is stabilized with ammonium and used as a high-temperature binder and catalyst in a wide range of industrial applications.
LUDOX® AS-40 is an ammonium-stabilized dispersion of negatively charged, amorphous colloidal silica particles. LUDOX® AS-40 particles have a high surface area, and the surface of these particles is rich in silanol groups. This makes LUDOX® AS-40 an excellent binder for metals, oxides, siliceous materials, and polymers with reactive functional groups. Standard colloidal silica grades are stabilized with sodium ions that can act as a flux at high temperatures. Since LUDOX® AS-40 is stabilized with ammonium ions rather than sodium, it is better suited for use in high-temperature applications and any applications that generally will not tolerate the inclusion of high levels of sodium.
Silica content (wt%): 39–41
Specific surface area (m2/g): 135
pH: 9.1
Specific gravity (@25°C): 1.30
Viscosity (@ 25°C): 11cP
Particle charge: Negative
Stabilizing counterion: Ammonium
Small, uniform particle sizes
Anionic particles
Excellent surface modification
Outstanding formulation stability
Suitable for high-temperature applications
High binder performance
Imparts antislip properties
Provides antiblocking
Ammonium stabilized
Stabilized against gelation
Nonporous and noncrystalline
Instability of binders in extremely high-temperature applications
Failure of binding material caused by sodium
Poor cohesive strength of ceramic and refractory materials
Inadequate adhesion of water-based coatings and adhesives to inorganic substrates
Insufficient abrasion resistance and durability of water-based coatings
LUDOX® AS-40 is an excellent binder for high-temperature applications, such as vacuum-formed fibrous shapes and refractory manufacturing. LUDOX® AS-40 is also ideal in catalyst applications where the presence of sodium stabilizing ions is detrimental, such as zeolites and emission-control products. In this application, LUDOX® AS-40 serves as a silica source and modifier to increase hardness and attrition resistance. When included in water-based coating, adhesive, or sealant formulations, LUDOX® AS-40 becomes an integral component of the polymer matrix and increases the durability of the latex film. The incorporation of LUDOX® AS-40 into latex paints and coatings also improves antiblocking and antisoiling properties.
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