85% Undensified Silica Fume

Home / Undensified Silica Fume / 85% Undensified Silica Fume
85% Undensified Silica Fume

85% Undensified Silica Fume

Share on facebook
Share on twitter
Share on linkedin
Share on tumblr
Share on skype
Share on whatsapp
Share on email
Share on print


85% Undensified Silica Fume is a micro-silica fume with 85% SiO2 content, and the Bulk density is 250-400kg/m³.

Silica fume is a byproduct of producing silicon metal or ferrosilicon alloys. It consists primarily of amorphous silicon dioxide (SiO2), its average granule diameter is 0.15~0.20 μm, specific surface area is 15000~20000 m2/kg. Mainly used for high transparency, high resistance to tear silicone rubber, silicone grease, sealed packaging materials such as capacitors.



StateAmorphous -Sub-micron powder
ColorGray to medium gray powder
Specific Gravity2.10 to 2.40
Bulk Density -Densified42 to 48 lb/'(500 to 650 kg/m³)
Bulk Density -Undensified “as produced”12 to 20 lb/(300 to 450 kg/m³)
Chemical RequirementsASTMTypical
Silicon Dioxide (SiO₂)%85.0 % Minimum0.9347
Moisture Content %3.0% Maximum0.0027
Loss on Ignition (LOI) %6.0% Maximum0.0382
Physical RequirementsASTMTypical
Oversize percent retained on 45-um (325 sieve)10.0 % Maximum0.0254
Accelerated Porzolaric Strength Activity Index
with Portland cement(7 day)
105.0% Minimum1.2607
Specific Surface15 ㎡/g Minimum22.28㎡/g


  • Water conservancy and hydropower engineering: in the anti-seepage and anti-abrasion parts, after mixing with micro-silica powder, it can greatly improve the anti-seepage, anti-cracking, anti-abrasion and anti-cavitation performance.
  • The production of high-strength concrete: silica powder as admixture to make high-strength concrete, the actual application of its strength level can be achieved 100Mpa.
  • Seaport engineering: concrete mixed with silica powder can improve the concrete’s anti-abrasion performance, anti-seepage performance, to prevent electrochemical corrosion of reinforcing steel.
  • Traffic engineering: silica powder concrete used in highway pavement and aircraft runway, can greatly improve the early strength and wear resistance of concrete, in the maintenance and repair of highway pavement, you can advance the opening time and increase the economic benefits.
  • Shotcrete: significantly improve the adhesion performance and cohesion of plastic concrete, significantly reduce the amount of rebound, increase the thickness of shotcrete once formed, shorten the construction period and save the cost of the project.


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.

Request a Quote

All information provided will be kept confidential.

Chinese Leading Silica Fume Manufacturer

HSA has advanced production equipment and standard experimental instruments, and maintains close contact and strategic cooperation with many famous multinational corporations. 

Factory area(㎡)
0 M
Annual output value ($)