Ludox HS-30 High pH is a 30% solids colloidal silica. It is formulated to a higher pH and is used as a binder in applications that require alkaline pH.
Ludox HS-30 High pH is an strongly alkaline, aqueous dispersion of silica with an average particle size of 12 nm. LUDOX®HS-30 high pH is notably useful as a binder in precision investment casting applications. It can also be used in coating formulations to improve durability and cohesion. LUDOX® HS-30 high pH also helps to improve soil resistance of anti-soil coatings and stool coatings.
Density (g/cm³, lb/gal): 1.21, 10.1
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: Sodium
Particle Charge: Negative
Biocide ppm: 240
Primary Chemistry: Colloidal Silica
Anionic Particles
Small Particle Size
Narrow Particle Size Distribution
Excellent Binding Strength
Stability in Most Applications
Optimized silica levels for investment casting and ceramic applications
Increased shell strength in precision investment and casting due to higher pH and Na2O
Alkaline pH Stability
Instability of silica dispersions in formulations with a very high pH.
Poor strength of molds formed for investment casting.
Investment Casting
Vacuum Formed Fibrous Shapes
Refractory Cements
Stool and Mold Coatings
Insulation Board
Ceramics Binder
Adhesives & Sealants
Elastomeric Foams
Paper and Film Coatings
Inorganic Coatings
Anti-Blocking Coating
Anti-Soil Treatment
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