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Classification of Silica Gel

Views:265     Author:Site Editor     Publish Time: 2020-08-03      Origin:Site

Silica gel, an amorphous substance, is a highly active adsorption material. It does not react with any substance except strong alkali and hydrofluoric acid. It is insoluble in water and any solvent, non-toxic, tasteless, and chemically stable. The chemical composition and physical structure of silica gel endows it with many characteristics that other similar material don’t have, such as high adsorption performance, good thermal stability, stable chemical properties, and high mechanical strength. These unique features enable silica gel to be made into many silicone products, such as silicone food containter, silicone ice mould, silicone foldable water bottle and silicone cake mould.



Silica gel can be divided into organic silica gel and inorganic silica gel.


According to the size of its pore size, inorganic silica gel is divided into: macroporous silica gel, coarse pore silica gel, B-type silica gel, fine pore silica gel, etc. Silica gel with different pore structure has various adsorption properties . Coarse-pored silica gel has a higher adsorption capacity under high relative humidity, while fine-pored silica gel has a higher adsorption capacity than coarse-pored silica gel under low relative humidity.


silica gel

Fine Pore Silica Gel

Fine-pored silica gel is colorless or light yellow.


Uses: Suitable for drying, moisture-proof and rust-proof. It can prevent instruments, meters, weapons and ammunition, electrical equipment, medicines, food, textiles and other items from getting damp. It can also be used as a catalyst carrier and in the dehydration refining of organic compounds. Thanks to its high density and strong moisture absorption capacity, it can be used as an air purifier to control air humidity. It is also widely used in sea transportation where goods often go bad due to high humidity during transportation. Silica gel can effectively absorb water and prevent moisture and ensure the quality of the goods.


Type B Silica Gel

Type B silica gel is milky white, transparent or translucent spherical or massive particles.


Uses: Mainly used as air humidity regulator, catalyst and carrier, pet litter, and as a raw material for fine chemical products such as chromatography silica gel.


Coarse Pore Silica Gel

Coarse-pored silica gel is white, and it can be lump, spherical and micro-spherical. Coarse-pored spherical silica gel is mainly used for gas purifiers, desiccants and acid scavenger for insulating oil, etc.; coarse-pored block silica gel is mainly used for catalyst carriers, desiccants, gas and liquid purifiers, etc.



Additional Knowledge

The main component of silica gel is silica, which is chemically stable and does not burn. Silica gel is a kind of amorphous silicon dioxide. So during operation, you should wear masks and keep the workshop well ventilated. The dust content in the workshop should be controlled within 10 mg/m3.


Silica gel has a strong adsorption capacity and can produce a drying effect on human skin. Therefore, you should wear work clothes during operation. If silica gel gets into your eyes, rinse with plenty of water and seek medical treatment as soon as possible.


Because blue silica gel contains a small amount of cobalt chloride, it is potentially toxic. If you accidently inhaled it, in case of poisoning, you should seek medical treatment immediately.


After absorbing water vapor or other organic substances during use, the adsorption capacity of silica gel decreases, but it can be reused after regeneration.


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