HSA Silica Fume

Silica Fume (Microsilica) for Sale

Silica Fume, also known as microsilica, are ultrafine powders collected as a by-product of the production of silicon and ferrosilicon alloys. Silica Fume particles are spherical and very fine, a property that makes them an excellent additive for concrete mixtures. They are widely used in high-rise buildings, refractory materials and other industries.

HSA was established in 2001, Silica fume is black or gray in color, and is available in several product forms and packaging options. Our products include:

We can also customize silica fume in various bulk density according to your needs.
HSA silica fume conforms to ASTM C1240, and is recognized by well-known testing institutions such as SGS.

Undensified Silica Fume (Microsilica)

Undensified Silica Fume, which is made from a large amount of highly volatile silicon monoxide gas produced during the smelting process, is rapidly oxidized with air and condensed into silica dust, for refractory, fertilizer, construction, etc.

Densified Silica Fume (Microsilica)

Densified Silica Fume, is a further processing of the original micro-silica fume to obtain a denser encrypted micro silica fume, commonly used in concrete applications.

Silica Fume Advantages

Very Stable Chemical and Physical Properties

Silica fume serves as a neutral filler with incredibly stable properties, both chemical and physical. It does not contain crystalline water, does not take part in the curing reaction, and does not impact the reaction process in any way.

Improved Corrosion Resistance

Silica fume is composed of silica, or SiO2, which is an inert material. This means that silica fume doesn’t react with most alkaloids or acids, and the silicon powder is evenly distributed over the surface of objects.

Good Adsorption Performance

Silica fume has a good adsorption performance, as well as good infiltration for various types of resin. In addition, it is easy to mix with no agglomeration phenomenon.

Reduced Precipitation and Stratification

Due to its reasonable distribution and fine grain size, silica fume can effectively eliminate stratification and reduce precipitation.

Silica Fume Applications

  • RefractoriesSilica fume is commonly used in castable, sintered, and fused refractories. For example, it can be used in high-performance, high-grade, and low-cement refractory castables and prefabricated parts, air permeable bricks, large-scale iron trenches and ladles, and more.
  • Mortar and concreteSilica fume can also be used for harbour wharfs, high-rise buildings, railway bridges, reservoir dams, concrete pavement, and more.
  • Protective coatingsNano-silica sol serves as an active material for fire protection, environmental protection, and anticorrosive coating.
  • Wall and decorative materialsSilica fume can also be used for thermal insulation mortar, polymer mortar, and as an interface agent for wall insulation.
  • Putty. Microsilica can be used in putty powder for exterior and interior wall insulation.
  • Filling and reinforcementIt is also used as filling and reinforcing materials in resin, rubber, paint, unsaturated polyester, and more.
  • Additives. Finally, silica fume is commonly used as an additive in other active areas.


The only silica fume factory in China that uses machine packaging.
We can also produce according to your requirement.
The machine is automatically packed and filtered by a screen, so that no debris is mixed in.