LUDOX® SK is an acidic colloidal silica that contains a water soluble polymer. It is an ideal binder for in investment casting applications.
LUDOX® SK is a slightly acidic aqueous dispersion of 12 nanometer amorphous silica particles. It contains 25% silicon dioxide, a water soluble green strength polymer, defoamer, and wetting agent. LUDOX® SK is a complete binder formulation ideal for casting applications. LUDOX® SK is typically used as a binder for face coat slurries in precision investment casting. The surfactant in the formulation allows for excellent adhesion to wax molds. LUDOX® SK is free from sodium and as such is highly stable at extreme temperatures used in the casting process. It provides improved green strength and added durability to ceramic molds.
Density (g/cm³, lb/gal): 1.17, 9.7
Boiling Point (760 mm Hg) °C / °F: 100 / 212
Melting Point °C / °F: 0 / 32
Vapor Pressure (25°C) mm Hg: 24
Vapor Pressure (38°C) mm Hg: 48
Stabilizing Counter Ion: None
Particle Charge: Negative
Biocide ppm: 25
Primary Chemistry: Colloidal Silica
Anionic Particles
Small particle size
Narrow particle size distribution
Green strength polymer and defoamer
Contains surfactant to aid slurry adhesion to wax pattern
Long slurry life
Low sodium content enhances high temperature shell properties
Low strength of investment casting molds that lead to defects in the casted product.
Inefficiencies of formulating a binder for investment casting applications.
Precision investment casting
High temperature refractories
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