Introduction to fumed silica

Fumed silica is a kind of inorganic chemical product with high performance.

It is produced by the vapor phase method, and the raw materials such as silicon tetrachloride are hydrolyzed in the hydrogen and oxygen flame to produce silica smoke at high temperatures, and then obtained after complex processes such as aggregation and cooling.

Physical property

Fumed silica is an ultra-fine white powder with a very small particle size, usually around 7-40 nanometers, which makes it have a huge specific surface area, generally reaching 100-400 square meters/gram.
- It has good dispersion and can be evenly dispersed in many liquid and solid systems.

Chemical property

- Chemical properties are very stable, it is an inert substance, resistant to acid, alkali and other corrosive substances erosion, can be stable in a variety of chemical environments.
- Has excellent thermal stability, will not easily decompose or change properties in high temperature environment.

Application field

- Paint industry: As a rheological agent, it can effectively prevent the settlement of pigments in the storage process of paint, and in the construction of paint, can adjust the rheological property of the paint, so that the paint has good leveling and anti-flow resistance, so that the coating is more uniform and beautiful.
- Adhesives and sealants industry: it can significantly improve the thixotropy of adhesives and sealants, prevent glue from flowing on vertical or inclined surfaces, and enhance the strength and toughness of adhesives.
- Silicone rubber industry: It is an efficient reinforcing agent of silicone rubber, which can greatly improve the mechanical properties of silicone rubber, such as tensile strength, tearing strength and hardness, etc., and can also improve the processing properties of silicone rubber, making the rubber more uniform and the surface of vulcanized rubber more smooth.
- Cosmetics industry: due to its good adsorption and dispersion, it can be used as a thickening agent, thixotropic agent and anti-settling agent in cosmetics. For example, in creams, lotions and other products, it helps the product maintain a stable texture, and can also adsorb the oil on the skin surface to keep the skin dry.

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