What is Fumed Silica?

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Fumed silica can be described as a fine white powder that is made by hydrolysis of silicon hailide at high temperature under an oxyhydrogen flame. It is a form of amorphous silicone dioxide product. The primary particle sizes are between 740 nm and 200-500 nm. The aggregate particle sizes range from 200-500 nm to about 100400 m2/g. It has high purity and a SiO2 content not less than 99.8%. There are a number of silica-hydroxyl groups in the vapor phase silicaaggregates that have untreated surfaces. One is an isolated, unperturbed free hydroxyl molecule; the other 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 will drop. When the external force is gone, the three-dimensional structure of the hydrogen bond (hydrogen link) will revert to its original state.

Fumed silica, one of the most valuable new inorganic material, is also very important. It has a small particle diameter, high specific surface area, high surface adsorption and large surface energy. Its high stability, reinforcing effects, thickening and thixotropy make it an irreplaceable choice in many unique fields.
It is used widely in various industries such as additives and catalyst carriers, decolorizing agent. matting agent. rubber reinforcing. agent. plastic filling agents. ink thickening. metal soft polishing. agents. insulation and adiabatic. spraying materials. medicine. environmental protection.

Fumed silica is mainly composed of two types of “sex”, hydrophilic or waterphobic. You can use chemical, mechanical, and physical methods to alter the fumed silicona interface or surface. This includes surface energy, surface wetability, reaction characteristics, surface structure, functional groups, and electrical properties. This allows it to be used in modern new material and new technology as well as the requirements of developing new technology.

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

Technology Co. Ltd. is a trusted global supplier of chemical material and manufacturer. They have over 12 years experience in producing super high-quality chemicals, Nanomaterials, such as silicon powder.
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