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LUDOX® SM-AS
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.
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Documents
- Manufacturer: Grace
- Product Line: LUDOX® Monodispersed Colloidal Silica
- Product: LUDOX® Colloidal Silica
- Industries: Adhesives | Agriculture | Building & Construction | Coatings | Inks
- Authorized Countries: Canada | United States
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Authorized Countries
Canada
United States
Overview
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.
Specifications
CAS number: 7631-86-9
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
Features & Benefits
- 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
Problems Solved
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.
Applications
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.
Related Applications
Adhesives
Building & Construction
- Caulks and Sealants
- Cements
- Ceramic Binders
- Ceramics
- Concrete Adhesives
- Concrete Admixtures
- Concrete Coatings
- Concrete Sealers
- Countertop Coatings, Sealants
- Firebrick
- Grout
- Gypsum
- High Strength Concrete
- Insulation
- Mortar
- Plasters
- Refractory Mortar
- Stucco Coatings
- Aerospace Coatings
- Appliances & Machinery Coatings
- Architectural Coatings
- Automotive OEM Coatings
- Brick Coatings
- Can Coatings
- Ceramic Coatings
- Coil Coatings
- Concrete Coatings
- Industrial Coatings
- Marine Coatings
- Metal Coatings
Related CAS Numbers
Building & Construction
Related Chemistries
Adhesives
Building & Construction
Coatings
Inks
Related Functions
Adhesives
Agriculture
Building & Construction
Coatings
Inks
Related Technologies
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