LUDOX® TMA is an anionic colloidal silica designed to be stable over a broad pH range. It is used to prepare "hybrid" binders for slurries used in casting.
LUDOX® TMA is a slightly acidic, aqueous dispersion of negatively charged silica particles with a particle size of 22 nanometers. It is unique in that it is not stabilized by a counter ion like sodium or ammonium. LUDOX® TMA is stable over a much broader pH range than most other colloidal silica (4-10). This makes it a versatile tool for formulators working both acidic and alkaline formulation conditions.
Density (g/cm³, lb/gal): 1.24, 10.3
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: None
Particle Charge: Negative
Biocide ppm: 25
Primary Chemistry: Colloidal Silica
Anionic particles
Intermediate particle size
Narrow particle size distribution
Broad pH stability (4-10)
Contains low sodium levels
Great surface modification performance and formulation stability
Instability of colloidal silica dispersions in acidic formulations.
Failure of ceramic and refractory binders when exposed to high temperatures.
LUDOX® TMA is most often used to prepare "hybrid" binders composed of ethyl silicate and colloidal silica for ceramic slurries used in precision investment casting applications. It is stable in extreme temperatures and therefore can also be used as a binder for ceramic materials used in refractory applications.
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