The "primary particle size" of fumed silica is 7-40 nm. What is the concept? We can understand from the comparison of the data in the table below. If we scale a fumed silica particle to a standard football size, we need to zoom in about 30 million times; if we scale the football by about 10 million times, it will become about the same size as Mars.

Since the particle diameter of the fumed silica is small, its specific surface area is very large, and the specific surface of the fumed silica is usually 100 to 400 m 2 /g. Usually, our 150m2 house has an indoor area of about 120m2, that is, a fumed silica product (such as HL-150) that uses the lowest specific surface area in the market. Less than 1g, its specific surface area can cover the entire house. area! And if a product with a high specific surface area (such as HL-380), only 18.8g of product, its specific surface area is equivalent to the size of a standard football field!

Due to its small particle size and large specific surface area, fumed silica has good adsorption properties and can be widely used in catalysts, food, medicine, thermal insulation materials, etc., and plays an important role in adsorption, anti-caking and heat insulation. And other functions.

In the powder industry, fumed silica is widely used as an anti-caking agent.

As we mentioned earlier, fumed silica itself has the characteristics of small particle size and large specific surface area. Such characteristics make it have good adsorption properties. Fumed silica can be widely used in the powder industry, and it also benefits from this. The analysis is as follows:

Has a large specific surface area. This property allows it to be wrapped around the surface of the powder material, which acts as a spacer between the powder particles, thereby preventing the adhesion from promoting the free flow of the powder.
Has a strong adsorption performance. The unique structure of fumed silica promotes its absorption of grease and moisture from the surface of the powder, thereby reducing the adhesion between the powders.
In the powder system, due to the small particle size and high surface energy of the silica, they can adsorb on the surface of the powder particles, thereby forming a surface layer on the surface, improving the fluidity of the powder, thereby greatly improving the production and transportation of the powder system. Efficiency in the process. At the same time, fumed silica can also be used as a dispersant in systems such as environmentally friendly high solids paints and powder coatings.

Therefore, fumed silica has also become one of the most widely used additives in the powder industry, and is used in powder products such as powdered foods (milk powder, coffee, seasonings), powder coatings, pesticides, and feeds.

In addition, fumed silica also has a series of unique properties such as low bulk density and high porosity, which are inseparable from the unique production process of fumed silica; and these unique structures and properties are also fumed silica bands. Comes with a unique application performance unlike other silicas. More versatile functions.