The chemical structure of silica
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95~99% of silica is SiO2. X-ray diffraction has confirmed that the structure of silica is different due to the different preparation methods of silica. The internal structure of fumed silica is almost entirely a three-dimensional network structure of closely arranged silicic acid. This structure makes the particles have low moisture absorption, strong surface adsorption and strong reinforcement. In addition to the three-dimensional structure of silicic acid, more two-dimensional structure silicic acid remains in the structure of precipitation silica, which makes the structure loose, has many capillary structures, and is easy to absorb moisture, which reduces its reinforcement. active
