LUDOX® HS-30 is a colloidal silica with an average particle size of 12 nm particle size. It is used as a binder in casting and ceramics applications.
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Product Overview
LUDOX® HS-30 is a 30% solids, alkaline dispersion of anionic amorphous silica. Due to its intermediate particle size it provides good binding strength as well as formulation stability. LUDOX® HS-30 is typically considered an all purpose grade of colloidal silica as it functions in various applications as a binder and/or surface modifier.
Product Specifications
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
Features & Benefits
Anionic Particles
Small Particle Size
Narrow Particle Size Distribution
Alkaline pH Stability
Excellent Bond Strength
Stability in most applications
Optimum Silica Content for Binding in Ceramics and Investment Casting Applications
Problems Solved
High defect rate in ceramics manufacturing.
Poor adhesion to metal and glass.
Coatings that scratch and mar easily.

LUDOX® HS-30 is formulated to the optimum silica level for use as a binder in investment casting and ceramics. It is commonly used to bind inorganic materials including metals and oxides like aluminum, iron, and ceramic fibers used in ceramics and refractory manufacturing. Incorporation of LUDOX® HS-30 into cermaic slurries improves green strength of formed ceramic parts and reduces defect rates during production.

LUDOX® HS-30 is used in water-based coatings and adhesives to improve durability. The silica particles in LUDOX® HS-30 surround the polymer particles in water-based formulations and become an integral part of the latex film upon coalescence. The use of LUDOX® HS-30 in coatings and adhesives has also shown to improve the adhesion of the formulation to a variety of substances including metal and glass.

The electrostatic nature of LUDOX® HS-30 makes it an efficient flocculant for waste water and paper making applications where positively charged contaminants must be removed. This functionality also proves useful in beverage fining applications. Food grade material is available for use in beverage fining applications.