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LUDOX® AS-30
LUDOX® AS-30 is an ammonium-stabilized alkaline dispersion of amorphous silica. This colloidal silica is typically used as a binder in catalyst and high-temperature ceramic applications and as a cobinder and surface modifier in paints and coatings.
LUDOX® AS-30 is a 30% active, alkaline colloidal silica with a particle size of 12 nm. The silica particles are stabilized with ammonium hydroxide, making it ideal for several applications where the presence of sodium ions from other LUDOX® grades cannot be tolerated.
LUDOX® AS-30 is an excellent binder and silica source for inorganic catalysts such as zeolites, where it minimizes the introduction of sodium content and increases chemical and thermal stability. It is also commonly used to improve the strength and durability of ceramics, refractory, and other inorganic materials, where resistance to thermal and mechanical shock is important.
LUDOX® AS-30 may increase durability in several latex-based adhesives and coatings. In adhesives, LUDOX® AS-30 will increase cohesive and shear strength. In coatings, it will improve resistance to abrasion, dirt pickup, and blocking.
Specifications
Silica content (%): 29–31 Specific surface area (m²/g): 198–258 pH: 9.1–9.7 Specific gravity (at 25°C): 1.2 Viscosity (at 25°C, cPs): 11 Particle charge: Negative Stabilizing counter ion: Ammonium
Negative sol; anionic Small particle size Narrow particle size distribution Ammonium counter ion Low sodium content Excellent binding strength Outstanding formulation stability Extreme temperature resistance
Problems Solved
Poor temperature resistance of binders used in ceramics and refractories Instability of coating, adhesive, and paint systems due to the presence of sodium ion Incompatibility of inorganic catalysts with binders and additives containing sodium Low abrasion, blocking, and dirt pickup resistance of paints and coatings Inadequate cohesive and shear strength of adhesives
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