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.

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.

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