Silica gel is a highly active adsorption material, usually with sodium silicate and sulfuric acid, and the process by a series of aging, acid bulbs and prepared. Silica gel is amorphous material, its chemical formula is mSiO2. nH2o. Insoluble in water and any solvent, non-toxic, odorless, chemically stable, it does not react with any substance except alkali, hydrofluoric acid. Various types of silicone because different manufacturing methods form different pore structure. Chemical composition and physical structure of silica gel, determines that it has many other features of similar materials difficult to replace: adsorption properties, thermal stability, chemical stability, high mechanical strength. Silica according to the size of the aperture is divided into: large pore silica gel, rough hole silica gel, B type silica gel, pore silica gel. Due to the different pore structure, adsorption properties so they have their own characteristics. Rough-silica gel in the case of high relative humidity had a higher adsorption capacity, pore silica gel in the case of low relative humidity higher than the coarse pore silica adsorption, while B-type silica gel due to the pore structure between the coarse and fine between the holes, the adsorption amount between the crude, between pores. Wide pore silica is generally used as a catalyst carrier, matting agents, toothpaste abrasive. You should choose different varieties for different purposes. [Safety] Silicone main component is silicon dioxide, chemically stable, does not burn. Silica gel is an amorphous silica dust in the workshop content should be controlled not more than 10mg / m3, the need to enhance ventilation, wear a mask operation. Silicone has a strong adsorption capacity, human skin can produce a drying effect, therefore, the operation should Wear overalls. If the silicone into the eyes, need plenty of water and seek medical treatment as soon as possible. Blue silicone because it contains a small amount of cobalt chloride, toxic, should avoid contact and inhalation mouth and food, such as poisoning should immediately seek medical treatment