Hydrophilic Fumed Silica

Hydrophilic fumed silica is produced by hydrolysis of volatile chlorosilanes in an oxygen-hydrogen flame. Chemically, these loose white powders consist of high-purity amorphous silica. Hydrophilic silica is wettable and dispersible in water. In addition to the application in traditional industrial fields, such as polyester, silicone, paint and coating, hydrophilic fumed silica products are more and more successfully used in high-tech fields. The nanoparticle characteristics and high purity of fumed silica play a leading role in its application in the electronics and optical fiber industries. Hydrophilic fumed silica products have an amorphous structure by X-ray analysis. According to different markets and application fields, we can provide primary particles with different particle sizes and products with different specific surface areas. Some fumed silica products are available in compressed form and some are pharmaceutical grade.

The function of hydrophilic fumed silica

Suitable for processing, adjusted to optimum rheology; reinforcement of silicone elastomers; thickening of non-polar liquids; flow aid for food and industrial powders; high chemical purity; excellent properties even at high temperatures Insulation properties; liquid into powder, such as medicine, cosmetics.

Hydrophobic Fumed Silica

Hydrophobic fumed silica is produced by chemically reacting hydrophilic fumed silica with reactive silanes such as chlorosilane or hexamethyldisilazane. It is hydrophobic (water repellent) 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, hydrophobic fumed silica is produced by treating 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. superior.

In addition to the above-mentioned advantages of hydrophilic products, hydrophobic fumed silica products are characterized by low hygroscopicity, good dispersibility, and rheological adjustment ability even for polar systems. Some products undergo structural modification on the basis of hydrophobic treatment, which can provide further help for customers to develop new products and improve product performance. For example: In a liquid system, hydrophobic fumed silica can be added in a high amount with little effect on the viscosity of the system.

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