Hydrophobic fumed silica is produced by a chemical reaction between a hydrophilic fumed silica and an active silane (such as chlorosilane or hexamethyldisilazane). It is hydrophobic (hydrophobic) and cannot be dispersed in water. In order to solve some special technical problems in the industry, various types of hydrophobic fumed silica have been developed. For example, by treating silane or siloxane to modify the hydrophilic grade fumed silica to produce hydrophobic fumed silica, in the final product, the chemical treatment agent is chemically bonded to the original hydrophilic oxide. on. In addition to the above advantages of hydrophilic products, hydrophobic fumed silica products are characterized by low hygroscopicity, good dispersibility, and rheological adjustment capabilities even for polar systems. Some products undergo structural modification on the basis of hydrophobic treatment, which can provide further assistance for customers to develop new products and improve product performance. For example: in liquid systems, hydrophobic fumed silica can reach high levels with little effect on the viscosity of the system.
   
Function of hydrophobic fumed silica: the most suitable rheology for processing and use; thickening of polar liquids, such as epoxy resin; reinforcement of silicone elastomers; high additions, such as in molded products; good Hydrophobicity, improve corrosion resistance; improve dielectric properties, such as in cable composites; powder glidants, such as in powder coatings and fire extinguishing agents; improve scratch resistance in coatings and plastics.