Silica gel according to the aperture size is divided into: macroporous silica gel, silica gel, silica gel, silica gel B. Since the pore structure is different, so their adsorption properties have different features. Coarse pore silica gel at high relative humidity condition had higher adsorption capacity, silica gel at low relative humidity condition adsorption amount higher than the coarse pore silica gel, while type B silicone due to pore structure between coarse pores, between the adsorption amount, also between, between coarse pores. Macroporous silica gel is commonly used as a catalyst carrier, matting agent, toothpaste abrasive. So it should be according to the different varieties.

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