LUDOX® HS-40 is an alkaline colloidal silica that offers a good balance between high binding strength and stability in coating and refractory applications.
LUDOX® HS-40 is an alkaline, 40% solids, dispersion of silica with a particle size of 12 nanometers. The silica particles in this grade of colloidal silica are rich in silanol functional groups and carry a negative charge that is stabilized with sodium. The large surface area and surface functionality of LUDOX® HS-40 particles make them an effective binder of metals, oxides, siliceous materials and polymers with reactive functional groups.
Density (g/cm³, lb/gal): 1.3, 10.8
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
Small particle size
Narrow particle size distribution
High thermal stability
Excellent binders
Adhesion promoters
Anti-slip properties
Anti-blocking agents
Soil retardants
Reinforcing agents for improved resistance
Improved polishing performance
Adhesion failure of water based coatings and adhesives to metal and glass surfaces.
Poor durability of coatings used in applications that require abrasion resistance.
Poor thermal stability of organic binders.
Ceramics that are too fragile and break during the manufacturing process
LUDOX® HS-40 acts as an inorganic glue in ceramic applications by binding siliceous materials and metals to improve cohesive strength of formed ceramic shapes.
LUDOX® HS-40 is useful in water-based coating formulations where the silica particles become an integral part of the latex film to improve durability, anti-blocking, and anti-soiling properties.
In water-based adhesives LUDOX® HS-40 can be used to promote adhesion to inorganic surfaces like metal and glass while also improving durability.
LUDOX® HS-40 is an excellent source of silica for concrete densifiers. The nanoparticles of amorphous silica in LUDOX® HS-40 easily penetrate into porous concrete to improve density and hardness without the risk of discoloration common to silicate densifiers.
LUDOX® Colloidal Silica is used in a wide range of processes to improve the and resiliency of building materials. Formulating LUDOX™ into concrete, coatings, adhesives, and sealants increases productivity and reduces cost while boosting the strength and consistency of the end product.
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