90% Undensified Silica Fume


90% Undensified Silica Fume



90% Undensified Silica Fume is a micro silica fume with 90% SIO₂ content, and the Bulk density is 240-320kg/m³.

♦ What Is Microsilica?

Microsilica, also known as silica fume, is a byproduct of the production of silicon metal or ferrosilicon alloys in the manufacturing of steel and iron. It is an extremely fine, amorphous, and reactive powder composed of silicon dioxide (SiO2). Microsilica is produced when raw materials containing silica, such as quartz or silicon, are subjected to high temperatures in a furnace. During this process, volatile substances are driven off, leaving behind the highly reactive microsilica particles.

Microsilica is often used as an additive in concrete and cement-based materials to enhance their performance. Its benefits include reduced permeability, increased compressive strength, and improved resistance to chloride and sulfate attacks. Due to its unique properties, microsilica plays a crucial role in the construction industry, particularly in the production of high-strength and high-performance concrete.

Silica Fume Supplier-Ewende

Ewende, your premier Silica Fume Supplier.Our 90% Undensified Silica Fume is just one example of the exceptional products we offer. It’s been engineered to meet stringent industry standards and is customizable to meet your specific requirements. Whether you’re seeking increased strength, reduced permeability, or enhanced durability, our silica fume solutions can be tailored to achieve your desired outcomes.

Contact us today to discuss your specific needs and let us help you achieve superior results with our customizable, top-tier silica fume products.


In the application of high-strength, high abrasion resistance, underwater casting of anti-scattering concrete, etc., the amount of silica fume admixture should not be too low usually accounting for 5%-10% of the cementitious material.

Use Ewende Silica Fume preparation of high-strength, early-strength concrete should be used with high-efficiency water reducing agent, with high-strength concrete should be selected with low air-entraining high-efficiency water reducing agent, depending on the situation can add defoamer.

In ordinary strength, impermeable, highly durable or self-compacting concrete applications, it is appropriate to use a multi-component cementitious material with low silica fume admixture, usually accounting for 2%-5% of the cementitious material.

The addition of silica fume needs to extend the mixing time, can not be mixed in wet concrete after mixing, it is recommended to extend the mixing time of 30 seconds than ordinary concrete to ensure uniform mixing.

Plastic shrinkage crack sensitive, better maintenance method is: spray concrete has not yet set, spraying curing agent maintenance; concrete hardening, the use of maintenance film, covered with wet sacks or plastic film.

90% Undensified Silica Fume Parameters

National Standards for Silica Fume for Concrete
National Standards and OrganizationsEuropeNorwayFranceAustraliaUnited StatesCanadaJapanChina
Standard Number132633045P18-50235861240A23.5A62071873627690
SiO2 %   ≥858585858585858585
SO3  %   <2 2.53 13  
CI- %   <0.3Report0.2Report
CaO  %   <12    1  
MgO  %   <      5  
Si %  <0.4     0.4  
Na2O+K2O     %  <  4     1.5
C    %   <  4      
Water Content   %   <   23 333
Burn Vector   %   <45 666564
Specific Surface Area ㎡/g15-35≥1220-35   ≥15≥15≥15
45μm Sieve Residue  %   <    1010 5 
Loose capacity   kg/m³   ReportReport    
Specific Gravity g/㎝³  2.1-2.3   Report  
Water Demand Ratio     %   ≤       125125
Volcanic Ash Activity Index%(3d)  ≥         
%(7d)  ≥   Report105858595105
%(28d) ≥10095    100115 
Water to Glue Ratio0.50.5  0.484
ConservationStandardStandard  AcceleratedAcceleratedStandardStandardAccelerated

90% Undensified Silica Fume Application

90% Undensified Silica Fume Packaging

Ewende is the premier Silica Fume Supplier, offering high-quality solutions to enhance your construction projects. Count on us for top-tier silica fume products tailored to your needs.

Silicon Powder for Sale

Densified Silica Fume

Densified Micro Silica Grade 85U90U92U, 94U95U

Undensified Silica Fume

Undensified Silica Fume Grade 85U90U92U, 94U95U96U99.9U

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silica fume powder