Colloidal Silica Liquid

Colloidal silicas are suspensions of fine amorphous, nonporous, and typically

spherical silica particles in a liquid phase. Usually they are suspended in an aqueous phase

that is stabilized electrostatically. Colloidal silicas exhibit particle densities in the range of

2.1 to 2.3 g/cm 3 .

Application:-

• In papermaking, colloidal silica is used as a drainage aid. It increases the amount of cationic starch that can be retained in the paper.
• High-temperature binders
• Investment casting - used as the inorganic binder in moulds
• An abrasive - for polishing silicon wafers
• As a binder or silica source in catalysts
• Desiccant
• Stabilizing and rigidizing refractory ceramic fiber blankets
• Abrasion resistant coatings
• Antisoiling – fills micropores to prevent take up of dirt and other particles into textiles.
• Surfactant – used for flocculating, coagulating, dispersing, stabilizing etc.
• Absorbent
• Colloidal silica is used in concrete densifiers and polished concrete.