Silica - Colloidal Silica (Silicon Dioxide)


Sometimes referred to as a sol or silica sol, colloidal silica consists of a stable dispersion amorphous silica particles. To achieve this, the silica particles must be small enough such that they are largely unaffected by gravity. Therefore, silica particle sizes are usually of the order of less than 100 nanometres.

The term colloid refers to the suspension, where the sols are the tiny discrete particles in suspension.

Colloidal silica’s can be manufactured from materials such as sodium silicate and are usually available in varying concentrations to suit various applications.


Applications areas include:


         High temperature binders

         Investment casting - used in moulds

         An abrasive - for polishing silicon wafers

         Carbonless paper


         Abrasion resistant coatings

         Increasing friction - used to coat waxed floors, textile fibres and railway tracks to promote traction

         Antisoiling – fills micropores to prevent take up of dirt and other particles into textiles

         Surfactant – used for flocculating, coagulating, dispersing, stabilising etc



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