Silica Fume
(also known as microsilica or fumed silica)
Special Packaging available:
25 kg or 950 kg Bags
(pictures shown below)
950 Kg
Jumbo Bag
Silica fume, also known as microsilica or condensed silica fume,  is used as a pozzolan.  It is a
byproduct from silicon metal smelting process,  resulting from reduction of high-purity quartz with coal
in an electric arc furnace.  Silica fume rises as an oxidized vapor from the high temperature furnaces,
then it condenses upon cooling and is collected in huge cloth bags. Condensed silica fume is
essentially silicon dioxide (typically 95% or greater from Jiuzhou Silicon Industry facilities) in
noncrystalline (amorphous) form. Since it is an airborne material like fly ash, it has a spherical shape
and is extremely fine with particles less than 1 micron in diameter and with an average diameter of
about 0.1 micron, about
100 times smaller than average cement particles.

Condensed silica fume has a surface area of about > 20,000 m2/kg (nitrogen adsorption method).  
In comparison, Type I and Type III
cements have surface areas of about 300 to 400 m2/kg and 500
to 600 m2/kg
(Blaine), respectively. The relative density (before desensification) of silica fume is
generally in the range of 2.20 to 2.5. Portland cement has a relative density of about 3.15.  

To improve the performance of cement, silica fume is generally used in amounts between 5 -10% by
mass of the total cementitious material. It is used in applications where a high degree of
impermeability is needed  and in high strength concrete. The product we supply meets (in fact
exceeds) ASTM C 1240.
           Silica fume
Industry Standards
Compared to silica fume from
other suppliers, our poduct is of
superior quality (much higher
SiO2 content) since our product
is from siicon metal smelting
production, while many others
are from ferrosilicon furnaces.
Representative Sample Technical Parameters
Scanning Electron Microscope (SEM) of silica fume showing
the particles are mostly spheric shapes

The material has wide industrial applications. For example, it is used in

  • Structures exposed to harsh chemical or environmental conditions
  • Bridge decks, highway overpass structures
  • Marine structures
  • Slabs
  • Airport runways
  • Pre-cast concrete and many others.

Useful links

Asia and Europe:
Tel: 0086-592-5163189
Mobile: 0086-13906012630

Xiamen Office
Jiuzhou Silion Industry
301-A,  166  East Tapu Road
Xiamen, Fujian Province
P. R. China

Americas(Jiuzhou Representative):
Tel:  1-917-825-3806

Roman Rakovsky
Rockleigh Industries inc
New Jersey, USA
Need specialty Silica Fume?

Please contact us for

  • Zirconium Silica Fume
  • Undensified Silica Fume
  • Pulpable bag packaged Silica

  • Enhanced mechanical properties and durability of concrete.
  • High strength and early strength in substructures of high-performance concrete.
  • Significant improved permeability resistance, abrasion resistance, anti-corrosion
    against chloride ion and anti-freezing.
  • Significantly reduced alkali-silica reactivity..

Samples available upon request.