The Decription of Microsilica

Microsilica (scientific name "silica fume," Micro silica or silicon ash), in the smelting of ferrosilicon and industrial silicon, silicon through the flue gas emitted by steam oxidation, the specially designed filter collected the amorphous powder like silica (SiO 2). Microsilica fume average 0.1-0.15 m in diameter, the size of several cement average 1.0%. Surface area for the 15-27 m 2 / g, with strong surface activity. The color of the micro-silica powder is between the light gray and the dark gray, SiO2 itself is colorless, its color depends mainly on the content of carbon and iron oxide, the higher the carbon content, the darker the color, the other Natural silica fume color dark.

When Microsilica is used in concrete, it acts as a filler and as a cementitious material. The small microsilica particles fill spaces between cement particles and between the cement past matrix and aggregate particles. Microsilica also combines with calcium hydroxide to form additional calcium hydrate through the pozzolanic reaction. Both actions result in a denser, stronger and less permeable material.

The Specifications of Microsilica

Model SiO2 Al2O3 CaO+MgO Na2O  Cl NaOH PH LOI
SF-95 95% 1.0 1.0 1.0 0.0055 1.0 5-7 6%max
SF-92 92% 1.0 1.0 1.0 0.0055 1.0 5-7 6%max
SF-90 90% 1.0 1.0 1.0 0.0055 1.0 5-7 6%max
SF-85 85% 1.0 1.0 1.0 0.0055 1.0 5-7 6%max




Jumbo bag with UV- Proof function and anti-aging character.

20kgs/25kgs Double layers paper bags

10kgs /12kgs waterproof  paper bag.


It should be stored in a dedicated warehouse that is well-ventilated and dry,and the condition is with waterproof & mostureproof, without ultraviolet radiation attack


Conveniently transport by Road, Railway, Sea, Pay attention to waterproof & moistureproof during transportation.