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LUDOX® LS
LUDOX® LS is an alkaline colloidal silica with a 12-nanometer particle size. It is formulated to contain lower sodium counterion levels than LUDOX® HS grades.
LUDOX® LS is a 30% solids aqueous dispersion of 12 nm surface-modified silica. It is formulated to a lower pH than the HS grades of LUDOX® and contains fewer sodium stabilizing ions, making it particularly useful in applications where sodium can be detrimental. LUDOX® LS also has good compatibility in solutions that contain organic solvents.
LUDOX® LS is typically used as a binder in ceramic fiber refractory manufacturing to increase thermal shock resistance and durability to ceramic parts. It can also be used as a binder in water-based coating formulations that contain organic cosolvents. Here, LUDOX® LS provides added durability to dried films and improves heat and chemical resistance.
In adhesive applications, LUDOX® LS increases adhesion to glass and metal surfaces and increases shear strength, improving the durability of the cured adhesive.
LUDOX® LS is also an excellent source of silica for concrete densifier formulations. This property provides a performance advantage over other types of silica in this application. The small particle size of the amorphous silica in LUDOX® LS allows it to react with hydroxides by easily penetrating the porous surface of concrete, increasing its density and hardness.
Specifications
Density, g/cm³, lb/gal: 1.2, 10 Boiling point at 760 mm Hg, °C (°F): 100 (212) Melting point, °C (°F): 0 (32) Vapor Pressure at 25°C, mm Hg: 24 Vapor Pressure at 38°C, mm Hg: 48 Stabilizing counter ion: Sodium Particle charge: Negative Biocide, ppm: 225
Primary Chemistry: Colloidal Silica
Features & Benefits
Excellent binding strength Good stability in most water-based formulations at higher pH Lower-sodium content Small particle size Narrow particle size distribution Compatible with organic solvents
Problems Solved
Poor thermal shock resistance or tensile strength of refractories Failure of ceramic binders at high heat due to the presence of a flux material like sodium Incompatibility with organic solvents in formulations
Applications
High-temperature ceramics and refractories Water-based coatings Concrete
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