The difference between fumed silica and precipitation silica Both fumed silica and precipitation silica are a kind of silica, but the production process used in the production of silica is different, and the silica produced by the meteorological method and the silica produced by the precipitation method There is no difference in essence, the chemical name is all silica.

The mesh number of fumed silica and precipitation silica is different: the fumed silica is produced by using silicon tetrachloride and air to burn silica, with a fineness of more than 1000 mesh. The precipitation method is to use sodium silicate to add sulfuric acid to precipitate silicon dioxide, and the fineness is only 300-400 mesh.

The use of fumed silica is different from that of precipitation silica: the silica produced by fumed silica is expensive and not easy to absorb moisture. Used as a matting agent in coatings. Precipitated silica is cheap and easy to absorb moisture. It can only be used for filling and reinforcing rubber and plastic products. However, a new type of silica has appeared on the market now. The fineness is nano-scale, which is called nano-silica. Its price is cheaper than that of the gas phase method, and it has a wide range of applications, such as coatings, rubber and plastics, etc. can be used.

Application skills of fumed silica and precipitation silica: the surface area of fumed silica is larger than that of precipitation, so the thickening of fumed silica is better than that of precipitation. If the silica gel requires high transparency, only fumed silica with a specific surface area of 400 can be selected. For silica gels with low requirements for color and transparency, the domestic meteorological silica with a specific surface area of 200 is commonly used. The quality of the products made by the fumed silica on coatings and silica gels is much better, and the amount used is relatively small. It seems to cost a lot of money, but in fact, there is nothing bad about the overall price/performance ratio.