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  • Silica gel is a granular, porous form of silica made synthetically from sodium silicate.
  • Silica gel is most commonly encountered in everyday life as beads packed in a semi-permeable plastic.


  • A solution of sodium silicate is acidified to produce a gelatinous precipitate that is washed then dehydrated to produce colorless silica gel.
  • Aminopropyl silica gel was prepared from porous silica gel and was used as a solid support for immunoadsorbent in the purification of anti-glycolipid antibodies.
  • Silica gels can be produced from different raw materials. However, the synthesis from mineral acids, e.g. sulfuric acid, and aqueous sodium silicate is the only industrial relevant process today.


  • Silica gel may also be used to keep the relative humidity inside a high frequency radio or satellite transmission system waveguide as low as possible.
  • Silica gel is also used to dry the air in industrial compressed air systems. Air from the compressor discharge flows through a bed of silica gel beads.
  • Silica gel is sometimes used as a preservation tool to control relative humidity in museum and library exhibitions and storage.


  • The sol-gel technology is believed to be an energy- and resource-saving process. At present, three directions of the sol-gel technology are employed to produce silica glasses suitable for optical applications.
  • Modern silica gel technology enables the production of highly pure gels that are composed of nearly 100% SiO2 with tailor-made pore systems and surface properties.

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