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Silica gel is a kind of colloid substance with characteristics of solid and its basic ingredient is silicon dioxide (sio2).The physical structure of silica gel is with rich finely porous structure and high specific surface area. The surface area structure of silica gel is silicon hydroxy and so silica gel has strong adsorption effect as well as selective adsorption and separate ion capacity vapour other polar substance, making it a versatile material for silica gel application across industries. Depending on the specific silica gel application, different types of silica gel such as indicating, non-indicating, or chromatographic grades are available to meet varied requirements, and it also has extensive uses in such fields as adsorption, drying, separation, purification and the preparation of high purified substance, etc.
Stable chemical character, insoluble in any other solvent or solution except for hydrofluoric acid (HF)and alkali, which holds true across different types of silica gel.
Good heat stability, Type A narrow pore silica gel can be used within 300℃, while other types of silica gel can be used for long term under the condition of high temperature 500-600℃;
Silica gel has the rigidity framework structure and also good wearability and crushing strength.
Each kind of specification from silica gel series products has its own characteristics, which is resulted from the fact that different types of porous structure is obtained through controlling relevant processing conditions in the process of manufacture of silica gel products in order to adapt itself to different application fields. Such as Preparation and drying of industrial gas, Medicine separation and purification, Chromatographic analysis, where specialized silica gel products provide optimal performance.
