Silica gel is a granular, vitreous, highly porous form of silica made synthetically from sodium silicate. Despite its name, silica gel is a solid. It is a naturally occurring mineral that is purified and processed into either granular or beaded form.
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The synthetic route for producing silica gel was patented by chemistry professor Walter A. Patrick at Johns Hopkins University, Baltimore, Maryland in 1919.
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For the coarse silica gel, can be placed within the gradually warming up to the roaster 500 - 600 ℃, after about 6-8 hours to rubber can be white or tan. Of pore silica gel, calcination temperature should not exceed 200 ℃.
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Among the many synthetic rubber, silica gel is one of the best. It has a tasteless non-toxic, not afraid of the characteristics of high temperature and to withstand cold
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