Best Price High Grade Quality SiO2 Silica Powder Micro Silica fume for Construction Material Concrete Admixture

FOB Reference Price:Get Latest Price
$130.00 - $195.00 / Metric Ton | 20 Metric Ton/Metric Tons (Min. Order)
Lead Time:
Quantity(Metric Tons) 1 - 100 101 - 500 501 - 1000 >1000
Est. Time(days) 14 21 45 Negotiable
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Quick Details
1 Year
After-sale Service:
Online Technical Support
Project Solution Capability:
Place of Origin:
Fujian, China
Brand Name:
Model Number:
Particle Shape:
Bulk Density:
550-700 kg/m3 (Densified)
SiO2 Content:
Surface Area:
Loss on ignition:
< 3%
Pozzolanic Activity Index:
> 115%
Construction Concrete, Hotel, Office Building, Mall, Sports Venues, Leisure Facilities, Warehouse, Workshop
Supply Ability
Supply Ability:
50000 Metric Ton/Metric Tons per Year
Packaging & Delivery
Packaging Details
1. 850kgs/900kgs/950kgs/1000kgs per jumbo bag with wooden pallet.
20bags per 20GP container, 26-28 bags per 40 HC container
2. Small bags inside ton bags (20kgs, 25kgs per bag)
3. Woven bag, water soluble bag or as per customers' requirements
China port
Lead Time :
Quantity(Metric Tons) 1 - 100 101 - 500 501 - 1000 >1000
Est. Time(days) 14 21 45 To be negotiated
Product Description

Microsilica (silica fume) is a byproduct of producing silicon metal or ferrosilicon alloys in smelters using electric arc furnaces. The smoke that results from furnace operation is collected and sold as silica fume, which consists primarily of amorphous (non-crystalline) silicon dioxide (SiO2). Its average granule diameter is 0.15~0.20um, specific surface area is 15000~20000m2/kg, and it has extremely strong surface activity. 



Product properties

Properties of Silica Fume



Particle shape



Dark grey / Light grey


This term simply means that silica fume is not a crystalline material. A crystalline material will not dissolve in concrete, which must occur before the material can react. 

Silicon dioxide (SiO2)

85% to 97 %


This is the reactive material in silica fume. Because of its very high amorphous silicon dioxide content, silica fume is a very reactive pozzolanic material in concrete. As the portland cement in concrete begins to react chemically, it releases calcium hydroxide. The silica fume reacts with this calcium hydroxide to form additional binder material called calcium silicate hydrate. It is largely this additional binder that gives silica-fume concrete its improved hardened properties.

Bulk density

280-400 kg/m3 (Undensified) / 550-700 kg/m3 (Densified)


The bulk density of the as-produced fume depends upon the metal being made in the furnace and upon how the furnace is operated. Because the bulk density of the as-produced silica fume is usually very low, it is not very economical to transport it for long distances.

Specific surface area:



Specific surface is the total surface area of a given mass of a material. Because the particles of silica fume are very small, the surface area is very large. We know that water demand increases for sand as the particles become smaller; the same happens for silica fume. 

Particle size

 < 1 µm


Silica fume particles are extremely small, with more than 95% of the particles being less than 1 µm . Particle size is extremely important for both the physical and chemical contributions of silica fume in concrete.

Specific gravity



Specific gravity is a relative number that tells how silica fume compares to water, which has a specific gravity of 1.00.  Silica fume has a specific gravity of about 2.2, which is somewhat lighter than portland cement, which has a specific gravity of 3.15. Thus, adding silica fume to a concrete mixture will not “densify” the concrete in terms of increasing the density of the concrete.

Packaging & Shipping

1. One ton jumbo bags on pallets
2. Small bags inside ton bags (20kgs, 25kgs per bag)
3. Woven bag, water soluble bag or as per customers' requirements




1).Appearance is as grey&white off.

2).High electrical resistivity

3).Low Permeability

4).Superior resistance to chemical attack from chlorides,acids and sulfates

5).Low chloride ion diffusion

6).High reactive Pozzolan

7).High temperature strength

8).Improved stability ingeothermal environment

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