LUDOX® SM-AS is an ammonium stabilized colloidal silica with 7 nm particle size. It is used as a binder in applications that require extreme temperatures.
LUDOX® SM-AS is an alkaline, aqueous dispersion of synthetic amorphous silica with a particle size of 7 nanometers. The silica particles carry a negative charge and work well to bind metals and oxides. LUDOX® SM-AS is stabilized with ammonium instead of sodium and therefore is more stable at ultra high temperatures than sodium stabilized colloidal silica.
Density (g/cm³, lb/gal): 1.16, 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: Ammonium
Particle Charge: Negative
Primary Chemistry: Colloidal Silica
Anionic particles
Very small particle size / high surface area
Narrow particle size distribution
Strong bond strength and stability in most applications
Low sodium levels
Fugitive counter ion
Incompatibility of a water based formulation with sodium ions.
Failure of refractory binders at very high temperatures.
Poor adhesion of structural adhesives and sealants to metal surfaces.
Contamination of waste water with cationic particles.
LUDOX® SM-AS is an ideal binder for ceramics applications requiring extreme heat resistance. It is especially useful in binding refractory fibers for firebrick and other refractory applications.
LUDOX® SM-AS can be used in latex coatings and adhesives to improve durability, heat resistance, and adhesion to metal and glass surfaces.
The electrostatic nature of LUDOX® SM-AS makes it an efficient flocculant for waste water treatment and papermaking applications where positively charged contaminants like proteins must be coagulated and removed.
In concrete densifiers, LUDOX® SM-AS provides the silica necessary to interact with remaining calcium hydroxide in cement to create new calcium silica hydrate and increase concrete density.
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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