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Fumed silica can be described as a fine white powder that is made by hydrolysis of silicon hailide at high temperatures using an oxyhydrogen torch. It is a form of amorphous silicone dioxide product. The primary particle sizes are between 740nm to 200-500nm. Aggregate particle sizes range from 200-500nm to about 200-500nm. Specific surface area is 100400m2/g. It has a high purity and SiO2 concentration not below 99.8%. There are a number of silica-hydroxyl groups in the vapor phase silicaaggregates that have untreated surfaces. The first is an isolated, unperturbed free hydroxyl molecule. The second is bonded silyl group that is linked and forms hydrogen bonds to one another. The vapor-phase silica aggregates have the untreated surfaces. They contain multiple -Oh compound, which can easily form an uniform three-dimensional network structure in the liquid system (hydrogen bond). This three-dimensional network structure, called the hydrogen bond, is formed by external force (shear, electric, etc.). The medium will crumble, the medium will thin out, and the viscosity of the medium will drop. When the external force vanishes, the three dimensional structure (hydrogen bonds) will recover itself.

Fumed silica, one of the most valuable new inorganic material, is an example. It has a small particle diameter, high specific surface area, strong surface adhesion, high surface energy, high chemical purity and good dispersion performance. Its high stability, reinforcing effects, thickening and thixotropy make it an irreplaceable choice in many unique fields.
It is used widely in many industries such as additives and catalyst carriers, petrochemical decolorizing agent and matting agent.

Fumed silica is primarily composed of two types of “sex”, hydrophilic or waterphobic. You can use physical, chemical, or mechanical methods to alter the fumedsilica interface. These include surface energy, surface wetability, reaction characteristics, surface structure, functional groups, and electrical properties. This allows it to be used in modern new materials, new technology, or for the development of new technologies.

Hydrophobic fumed Silica Applications
Thickening of certain polar liquids like epoxy resins. Silicone elastomer reinforcement. High addition. Good hydrophobicity. Improved anticorrosion. Powder flow AIDS.

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