Hydrophilic fumed silica
Hydrophilic fumed silica is produced by hydrolysis of volatile chlorosilanes in an oxyhydrogen flame. From a chemical point of view, these loose white powders are composed of high purity amorphous silica. Hydrophilic silica can be wetted with water and dispersed in water. In addition to applications in traditional industrial applications such as polyesters, silicones, paints and coatings, hydrophilic fumed silica products are increasingly used in high-tech applications. The nanoparticle properties and high purity of fumed silica have played a leading role in the electronics and fiber industries. The hydrophilic fumed silica product has an amorphous structure by X-ray analysis. Depending on the market and the application, we can offer primary particles of different particle sizes and products with different specific surface areas. Some fumed silica products are available for compression and some are pharmaceutical grade.

Hydrophilic fumed silica function: suitable for processing, adjustment to optimum rheology; reinforcement of silicone elastomers; thickening of non-polar liquids; glidants for food and industrial powders; high chemistry Purity; excellent insulating properties even at high temperatures; liquids converted into powders such as medicines and cosmetics.

Hydrophobic fumed silica
Hydrophobic fumed silica is produced by chemical reaction of hydrophilic fumed silica with a reactive 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. If a hydrophobic fumed silica is produced by treating a modified hydrophilic grade fumed silica with silane or siloxane, in the final product, the chemical treatment agent is chemically bonded to the original hydrophilic oxide. on. In addition to the above advantages of the hydrophilic product, the hydrophobic fumed silica product is characterized by low hygroscopicity, good dispersibility, and rheology adjustment capability even for polar systems. Some products, after structural modification on the basis of hydrophobic treatment, can further help customers develop new products and improve product performance. For example, in a liquid system, the hydrophobic fumed silica can achieve a high addition amount with little effect on the viscosity of the system.
The function of hydrophobic fumed silica: the most suitable rheology in processing; the thickening of polar liquids, such as epoxy resins; the reinforcement of silicone elastomers; the high addition, as in molded products; good Hydrophobicity, improved corrosion resistance; improved dielectric properties, such as in cable composites; powder glidants, such as in powder coatings and fire extinguishing agents; improved scratch resistance in coatings and plastics.