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 it 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 counterion: Sodium
Particle charge: Negative
Biocide (ppm): 240
Small particle size
Narrow particle size distribution
High thermal stability
Excellent binder
Promotes adhesion
Imparts antislip properties
Provides antiblocking
Retards soiling of coatings
Reinforcing agent for improved resistance
Improves polishing performance
Increases hydrophilicity and ink receptivity of glossy paper
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 used in refractory applications
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 the 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, antiblocking, and antisoiling properties.
In water-based adhesives, LUDOX® HS-40 particles promote adhesion to a range of inorganic surfaces, like metal and glass, while 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 porous concrete. As a result, the density and hardness of the concrete are increased.
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