85% Densified Silica Fume


85% Densified Silica Fume


Product Introduction

85% Densified Silica Fume is a micro silica fume with 85% SIO₂ content, and the Bulk density is 240-320kg/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.

To ensure the quality of our Silica Fume Powder,we meets the requirement of ISO9001/14001/45001, CNAS and IAF.

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85% Densified Silica Fume Features

Increased StrengthOur Microsilica boosts the compressive strength of concrete, making it ideal for high-performance and structurally demanding applications.
Densified FormThe densified nature of this product ensures ease of handling and dispersion during the mixing process, allowing for consistent and reliable results.
Improved DurabilityIt enhances the resistance of concrete to chemical attacks, abrasion, and corrosion, extending the lifespan of your structures.
Reduced PermeabilityMicrosilica reduces the permeability of concrete, making it less susceptible to water penetration and frost damage.
Enhanced WorkabilityDespite its high reactivity, our 85% Densified Microsilica can improve the workability of concrete, making it easier to handle during construction.
Environmental BenefitsIt contributes to more sustainable construction practices by reducing the need for additional cement content, which helps lower CO2 emissions.


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 85% Densified Microsilica 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 85% Densified Microsilica 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.

85% Densified Silica Fume Parameters

Ewende Silica Powder is produced in conformance with the ASTM specifications. The quality is controlled and monitored throughout the entire production process to ensure that it meets or exceeds specification requirements.

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

85% Densified Silica Fume Application

At Ewende, we take pride in offering top-notch materials that empower your projects to excel. Trust in our 85% Densified Microsilica to help you build a future that’s stronger and more resilient. Contact us today to learn more about how this remarkable product can make a difference in your construction endeavors.

85% Densified Silica Fume Packaging

Ewende is a leading provider of Silica Fume in China, and also the premium source of high-performance Silica Fume products for concrete and refractory industries. We can also produce according to your requirements.

Silica Fume for Sale

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Ewende’s mission is to provide professional services, high quality products, strict after-sales control, and actively solve customer problems for mutual benefit and win-win.

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silica fume powder

FAQ about 85% Densified Silica Fume

♦ Are you a factory or a middleman?

Ewende New Materials Co., Ltd. is a professional manufacturer and supplier of Micro Silica Powder, with a variety of submerged arc furnace types.

♦ How long will it take for delivery?
Usually, it will be around 15 days after the order confirmation or deposit.

What are the payment terms?

TT, L/C, D/P, and Paypal are also available.

♦ What’s your MOQ?
Usually 10 tons to start.

♦ Can you print our brand or logo for the packing?
We will offer our Neutral Packing, according to the actual quantitative can negotiate the outer packaging logo spraying.

♦ Can you offer samples for testing?
Sure, samples would be available for testing purposes. Usually, our samples are for free in testing quantity, if more, our customer service department would consider them accordingly.

♦ How to get a quote?

Hello, please provide the detailed product model, specification and quantity. If there is a bill of materials, you can send the bill of materials to ewende@microsilica-si.com.