PRODUCTS

MICROSILICA (FUMED SILICA)

Microsilica (Fumed Silica) enhances casting performance.
Microsilica (Fumed Silica) strengthens high temperature resistance.
Microsilica (Fumed Silica) is used strong hydrophilic and activity, which can enhance the cohesion of refractory materials.

CAS Number: 7631‑86‑9 (also 112945‑52‑5, newer CAS for pyrogenic fumed silica)
EC Number: 231‑545‑4
MDL Number: MFCD00149856
Chemical Formula: SiO₂ (synthetic amorphous silicon dioxide)
Molecular Weight (Molar Mass of SiO₂ unit): 60.08 g/mol

SYNONYMS:
Fumed silica, Pyrogenic silica, Synthetic amorphous silica, Colloidal silicon dioxide, Fumed silicon dioxide, Aerosil 200, Fumed colloidal silica, Silicon dioxide (pyrogenic), Fumed silica, Pyrogenic silica, Synthetic amorphous silica, Colloidal silicon dioxide, Fumed silicon dioxide, Aerosil 200, Fumed colloidal silica, Silicon dioxide (pyrogenic), Silica, Silicic anhydride, Silicon dioxide, Silicon dioxide amorphous

Microsilica (also known as Microsilica (Fumed Silica)) is very fine noncrystalline silica by-product resulting from the reduction of high-purity quartz and carbon in electric arc furnaces during the production of elemental silicon or alloys containing silicon.
Microsilica (Fumed Silica) consists of very fine vitreous particles with a surface area ranging from 15 to 30 m2/g, with particle approximately 100 times smaller than the average cement particle.

Because of its extreme fineness and high silica content, Microsilica (Fumed Silica) is a highly effective pozzolanic material.
Micro silica is used in concrete to improve its properties.
It has been found that Microsilica (Fumed Silica) greatly improves compressive strength, bond strength, and abrasion resistance; reduces permeability; and therefore helps in protecting reinforcing steel from corrosion.

Microsilica (Fumed Silica) is a type of amorphous, nano-sized silica produced by the vapor-phase hydrolysis of silicon compounds.
Microsilica (Fumed Silica) consists of fine, amorphous particles composed of silicon dioxide (SiO2).

Microsilica (Fumed Silica) is known for its unique properties, including high surface area, pozzolanic reactivity, and its ability to enhance the performance of various materials.
Microsilica (Fumed Silica) is also called Microsilica (Fumed Silica),micro silica, silica dust, which is widely used in concrete’s field and refractory’s field, ceramic and rubber applications.

Microsilica (Fumed Silica) is a by-product from manufacturing silicon metal or ferrosilicon alloys, produced from reduction of high purity quartz(sio2) with coal in an electric arc furnace in the manufacture of silicon or ferrosilicon alloy.
Microsilica (Fumed Silica) consists primarily of amorphous (non-crystalline) silicon dioxide(SiO2).

The individual particles are extremely small, approximately 1/100th the size of an average cement particle.
Because of its chemical & physical properties, like high silica content & extreme fineness, Microsilica (Fumed Silica) is a very effective pozzolanic material.

Concrete containing Microsilica (Fumed Silica) can have very high strength and can be very durable.
Microsilica (Fumed Silica) is finer particle than Cement.
Microsilica (Fumed Silica) is produced by some chemical processing of the ash.

Microsilica (Fumed Silica) is used in high strenght concretes (Example. M50,M60 & above).
The purpose is to fill the the small voids which cement can’t fill.
The surface area of Microsilica (Fumed Silica) is appx 30000 -45000 sqm/kg whereas for cement it is 350 – 600 sqm /kg.

Microsilica (Fumed Silica) is 100 times finer than cement.
the surface area for opc cement is 225 sqm/kg.
Microsilica (Fumed Silica)s gives more strength to the concrete as it fill the void which exist between the cement partical rail corporation is going to used for designing m80 or more grade concre.

Microsilica (Fumed Silica), also known as fumed silica, is a fine powder composed of silicon dioxide.
Microsilica (Fumed Silica) is an ultrafine powder collected as a by-product during the production of the silicon and ferrosilicon alloys.
Microsilica (Fumed Silica) is a highly inert, absorbent, and white-coloured powder.

Microsilica (Fumed Silica) is an admixture commonly used in concrete due to its ability to improve engineering properties.
Microsilica (Fumed Silica) is a highly pure pozzolanic additive for the production of special types of concrete of your own recipe.
You can produce high-performance and ultra high performance concrete (UHPC) yourself.

In addition, you can design concrete mixes with a high degree of safety against efflorescence.
With its extremely small particle size, Microsilica (Fumed Silica) is about 100 times finer than cement.
Thus, Microsilica (Fumed Silica) is highly reactive and is ideally suited to fill the pore spaces between the cement particles.

In addition, Microsilica (Fumed Silica) greatly improves the flowability of self-compacting concrete.
This creates a particularly tight and solid concrete.
A dosage of 5% by weight of the amount of concrete contained is recommended for the production of ultra high-performance cement (UHPC).

The water to cement ratio should be set between w/c = 0.2 and w/c = 0.35 and a PCE superplasticizer should be used.
In summary, grey Microsilica (Fumed Silica) has similar versatile applications to white Microsilica (Fumed Silica)e, particularly in enhancing the properties of construction and industrial materials such as concrete, refractory materials, and coatings.

Microsilica (Fumed Silica)'s usage is driven by its ability to improve strength, durability, and resistance to various environmental and chemical factors.
Microsilica (Fumed Silica) is a by-product of silicon metal production.

Microsilica (Fumed Silica) is a densified or undensified amorphous powder, obtained by the metallurgical process of silicon in an electrical arc furnace.
Microsilica (Fumed Silica) particles are about 30 to 100 times smaller than cement grains and consist almost entirely of amorphous silicon dioxide (SiO2).

They fill a part of the pore space (micro-filling effect) and support the increase in strength through a pozzolanic secondary reaction.
In addition, the corrosion protection for the reinforcement or the resistance against water penetration can be improved.
Microsilica (Fumed Silica) consists of extremely fine dust particles, which can be assumed to be on average 100 times smaller than the average size of a cement grain.

For technical reasons, Microsilica (Fumed Silica) dust is delivered in a concentrated form as micro granules which are agglomerates of individual particles.
Microsilica (Fumed Silica) is a very important addition to tight concrete.

Replacing 15% of cement with Microsilica (Fumed Silica) increases the tightness of concrete several dozen times, which is difficult to achieve by other methods.
In addition, the compression strength is increased by 20% and absorbability is reduced three times.

However, the addition of Microsilica (Fumed Silica) is associated with a decrease in consistency, which makes the fresh concrete mix difficult to work with.
This can be prevented by adding a superplasticizer.

It is worth noting, however, that the superplasticizer cannot be used uncritically, especially in Microsilica (Fumed Silica) concretes, due to its negative impact on strength.
Microsilica (Fumed Silica) is an inorganic, amorphous silicon dioxide (SiO2), which consists of very small particles collected by the filter systems on our electric arc furnaces during the production of silicon and ferrosilicon.

USES and APPLICATIONS of MICROSILICA (FUMED SILICA):
For Other Applications of Microsilica (Fumed Silica): Microsilica for Ceramic, Microsilica for Gypsum Board, Microsilica for Construction, and Microsilica for Fertilizer.
The difference of Microsilica (Fumed Silica) content results in different performance in concrete, like compressive strength, chloride permeability, etc.

So does their application: low-grade (low SiO2 content) microsilica can be used for substructures mix (for example: 40Mpa), but for higher strengths or more durable concrete, high-grade microsilica should be selected.
High-Strength Repair and Overlay Materials: Grey Microsilica (Fumed Silica) is used in the production of high-strength repair mortars and overlay materials for patching and resurfacing damaged concrete surfaces.

Ceramics and Advanced Materials: Microsilica (Fumed Silica) can be used as a raw material in the production of advanced ceramics and composite materials for various high-tech applications.
Fillers in Polymer Composites: Grey Microsilica (Fumed Silica) can serve as a filler in polymer composites to improve mechanical properties and thermal stability.

Waterproofing: Microsilica (Fumed Silica) is added to waterproofing products to enhance their resistance to water penetration and improve overall waterproofing system performance.
Corrosion Protection Coatings: Grey Microsilica (Fumed Silica) is used in anti-corrosion coatings for steel structures and reinforcement bars in concrete to extend their lifespan.

Oil Well Cementing: In the oil and gas industry, grey Microsilica (Fumed Silica) is used in oil well cement formulations to improve mechanical properties and resistance to high-temperature and high-pressure conditions downhole.
Repair and Rehabilitation of Structures: Microsilica (Fumed Silica) can be used in repair and rehabilitation projects for damaged concrete structures to enhance durability and performance.

Precast Concrete Products: Manufacturers of precast concrete products, such as architectural panels, pipes, and bridge components, may use grey Microsilica (Fumed Silica) to improve strength and density.
Grouts and Mortars: Grey Microsilica (Fumed Silica) is sometimes added to grouts and mortars used in construction to enhance strength and impermeability.

Oil Well Cementing: In the oil and gas industry, Microsilica (Fumed Silica) is added to oil well cement formulations to improve their mechanical properties and resistance to high-temperature and high-pressure conditions downhole.
Repair and Rehabilitation of Structures: Microsilica (Fumed Silica) can be used in repair and rehabilitation projects for damaged concrete structures to enhance the durability and performance of the repaired sections.

Precast Concrete Products: Manufacturers of precast concrete products, such as architectural panels, pipes, and bridge components, may use Microsilica (Fumed Silica) to improve the strength and density of their products.
Grouts and Mortars: Microsilica (Fumed Silica) is sometimes added to grouts and mortars used in construction to enhance their strength and impermeability.

High-Strength Repair and Overlay Materials: Microsilica (Fumed Silica) is used in the production of high-strength repair mortars and overlay materials for patching and resurfacing damaged concrete surfaces.
Ceramics and Advanced Materials: Microsilica (Fumed Silica) is used as a raw material in the production of advanced ceramics and composite materials for various high-tech applications.

Fillers in Polymer Composites: Microsilica (Fumed Silica) can be used as a filler in polymer composites to improve their mechanical properties and thermal stability.
Waterproofing: Microsilica (Fumed Silica) is added to waterproofing products to enhance their resistance to water penetration and improve the overall performance of waterproofing systems.

Microsilica (Fumed Silica) is frequently used in construction applications where its ability to improve engineering properties can be utilized.
Additionally, Microsilica (Fumed Silica) has also been used in grouts, mortars, plasters, stucco and other cementitious mixtures.
Microsilica (Fumed Silica) enhances the strength of refractory castables.

Microsilica (Fumed Silica) (scientific name "silica fume, " Microsilica or Silica Fume), in the smelting of ferrosilicon and industrial silicon, silicon through the flue gas emitted by steam oxidation, the specially designed filter collected the amorphous powder like silica (SiO 2).
Microsilica (Fumed Silica) average 0.1-0.15 μ m in diameter, the size of several cement average 1.0%.

Surface area of Microsilica (Fumed Silica) for the 15-27 m 2 / g, with strong surface activity.
Microsilica (Fumed Silica) is added to cement concrete to improve its properties, in particular its compressive strength, bond strength, and abrasion resistance.

These improvements stem from both the mechanical improvements resulting from addition of a very fine powder to the cement paste mix as well as from the pozzolanic reactions between the Microsilica (Fumed Silica) and free calcium hydroxide in the paste.

Addition of Microsilica (Fumed Silica) also reduces the permeability of concrete to chloride ions, which protects the reinforcing steel of concrete from corrosion, especially in chloride-rich environments such as coastal regions and those of humid continental roadways and runways (because of the use of deicing salts) and saltwater bridges.

Microsilica (Fumed Silica) is a densified or undensified admixture which consists primirily very fine amorphous SiO2 particles and meets ASTM C-1240 standarts, Microsilica (Fumed Silica) is used in construction, construction chemicals and refractory industries.

Application of Microsilica (Fumed Silica): high-strength concrete, amorphous refractory materials, dry-mixed (ready-mixed) mortar, high-strength non-shrinkage grouting material, wear-resistant industrial floor, repair mortar, polymer mortar, thermal insulation mortar, impervious concrete, self-leveling concrete , Concrete compacting agent, concrete preservative, cement-based polymer waterproofing agent; reinforcement of rubber, plastic, unsaturated polyester, paint, coating and other polymer materials, modification of ceramic products, etc.

Application areas of Microsilica (Fumed Silica): Ready mixed concrete and grout, Refractory industry, Offshore and marine structures, Dams, tunnels, bridges and motorways, Industrial floors,
Shotcrete applications, Concrete pipes, Precast ve prefabric industry, and High rise buildings.

Properties and applications of Microsilica (Fumed Silica): production of mortars and castables, production of insulating materials, production of ceramic and refractory products, and other industrial applications.

Microsilica (Fumed Silica) is used as an additive to improve the properties of concrete and mortar formulations.
Microsilica (Fumed Silica) is also used in the fields of refractories, granulated fertilizers (coating) and in the production of plastics and adhesives.

-Application of Microsilica (Fumed Silica) in concrete:
Microsilica (Fumed Silica) is widely used in concrete field especially high: Performance project, such as bridge, airport, hydropower station.
Seawall, railway projects.

The main functions as follow:
(1)Enhance the mechanical properties of concrete.
The most important character for concrete:
High strength and early strength has been used in substructures of high-performance concrete.

(2)Improve the durability of concrete.
Significant improvements can be seen in the permeability resistance, abrasion resistance, anti-corrosion against chloridion, refractorily and anti-freezing of concrete.

(3)Enhance constructability.
Improve Shotcrete, Increase Early Strength, control Temperature contractors can take advantage of the properties of silica-fume concrete to expedite projects or to achieve properties that might otherwise be impossible to achieve.

(4) Increase density, decrease freight cost.
By densifying Microsilica (Fumed Silica) utilizing the Russil Tech Process allows the media to become more flowable and controllable.
Using advanced Technology, densities can be increased from 100kg/m To 700 kg/m, and is still able to be dispersed back to its natural state.

-Microsilica (Fumed Silica) is used for Cement.
Microsilica (Fumed Silica) can fill the pores between cement particles.

Microsilica (Fumed Silica) reacts with calcium hydroxide in water to form calcium silicate hydrate (C-S-H) gels, and also with magnesium oxide and water to form magnesium silicate hydrate (M–S–H) gels.

For cement-based concrete, mortar, mixing the right amount of Microsilica (Fumed Silica) can significantly improve its compressive strength, flexural strength, impact resistance, corrosion resistance, wear resistance; as well as reduce its permeability.

-Corrosion Protection Coatings:
Microsilica (Fumed Silica) is used in anti-corrosion coatings for steel structures and reinforcement bars in concrete to extend their lifespan.
These are just some of the many applications of white Microsilica (Fumed Silica).

Microsilica (Fumed Silica)'s use is driven by its ability to improve the performance of various construction and industrial materials in terms of strength, durability, and resistance to harsh conditions.

Microsilica (Fumed Silica), whether it’s white or grey, typically has similar properties and applications.
The color difference may arise from variations in impurities or the manufacturing process, but Microsilica (Fumed Silica) doesn’t significantly affect its general uses.

-Like white Microsilica (Fumed Silica), grey Microsilica (Fumed Silica) is also utilized in various applications, including:
*Concrete and Cementitious Materials:
High-Performance Concrete (HPC):
Grey Microsilica (Fumed Silica) can be added to concrete mixes to improve strength, durability, and resistance to chemical attacks.
HPC is commonly used in infrastructure projects, high-rise buildings, and marine structures.

-Refractory Materials:
Grey Microsilica (Fumed Silica) is employed in the production of refractory materials, such as high-temperature-resistant bricks and castables used in furnaces and kilns.
Microsilica (Fumed Silica) enhances their resistance to thermal shock and corrosion.

-Shot Blasting and Flooring:
In industrial flooring applications, grey Microsilica (Fumed Silica) is sometimes added to coatings and overlays to increase abrasion resistance and durability.
Microsilica (Fumed Silica) is also used in shot blasting to prepare concrete surfaces.

-Shot Blasting and Flooring:
In industrial flooring applications, Microsilica (Fumed Silica) is sometimes added to coatings and overlays to increase abrasion resistance and durability.
Microsilica (Fumed Silica) is also used in shot blasting to prepare concrete surfaces.

-Concrete and Cementitious Materials:
High-Performance Concrete (HPC):
Microsilica (Fumed Silica) is often added to concrete mixtures to improve its strength, durability, and resistance to chemical attack.
HPC is commonly used in infrastructure projects, high-rise buildings, and marine structures.

-Shotcrete:
Microsilica (Fumed Silica) is added to shotcrete mixtures (sprayed concrete) to increase its bonding strength and reduce permeability.
This is useful in construction for tunnel linings, pools, and slope stabilization.

-Refractory Materials:
Microsilica (Fumed Silica) is used in the production of refractory materials, such as high-temperature-resistant bricks and castables used in furnaces and kilns.
Microsilica (Fumed Silica) helps enhance their resistance to thermal shock and corrosion.

WHERE IS MICROSILICA (FUMED SILICA) USED?
The most important application is in the production of high-performance concrete and repair products (mortars and grouts), as the controlled addition of Microsilica (Fumed Silica) results in increased strengths and long-term durability.
High-performance Microsilica (Fumed Silica) concrete provides architects and engineers with greater design flexibility for structures such as bridges, viaducts, ports, skyscrapers, offshore platforms, as well as providing durability confidence for projects such as dams, power stations and industrial applications.
Other areas of use for Microsilica (Fumed Silica) include fibre-cement products, concrete roofing tiles, oil and gas well cements, gypsum and cement wallboards and refractories products.

BASIC CHEMISTRY AND MULTIPLE ADVANTAGES of MICROSILICA (FUMED SILICA):
Microsilica (Fumed Silica) is a co-product of silicon or ferrosilicon production, consisting of ultrafine (sub-micron), amorphous, non-porous, perfectly spherical silicon dioxide (SiO2) particles, with purity levels of 85–99%.

The main effect of these ultra-fine particles is to greatly improve particle packing and produce a highly pozzolanic reaction in concrete and other cementitious bond systems where the silicon dioxide reacts with calcium hydroxide, heightening performance levels and the strength and durability of these materials.

Additionally, Microsilica (Fumed Silica), because of its amorphous (non-crystalline) structure and its high specific surface area, provides other useful features to various applications, including improved sintering capabilities and enhanced high-temperature performance of refractory castables, resulting in reactions between microsilica and other components of the refractory mix.

To summarize, Microsilica (Fumed Silica) has two key features which alone or in combination are the basis for its high performance:
An efficient 'filler effect', resulting from the size of the spherical, non-porous primary particles of about 0.15 μm (150 nm)
The 'chemical effect', resulting from the fact that its amorphous nature and high specific surface area make it highly reactive.

A review of some leading products and applications in different industries
Applications are very numerous, including uses in construction, well drilling & cementing, refractories, polymers, etc.

This versatility also explains why Microsilica (Fumed Silica) is referred to by different names in different industries, such as condensed Microsilica (Fumed Silica), the latter used, for example, in high-performance materials (HPM) in the construction and refractory industries.

BENEFITS of MICROSILICA (FUMED SILICA) IN CONCRETE ADDITIVE
*Longer service life:
Microsilica (Fumed Silica) is a highly reactive pozzolan and gives concrete a denser Microstructure, Lower Permeability & Higher Electrical Resistivity leading to improved durability.

The durability of a reinforced concrete structure can be defined as the capability of the structure to maintain Microsilica (Fumed Silica)'s original functional and structural characteristics during the expected service life in the exposure conditions it was intended for.
Combined with correct design and workmanship, Microsilica (Fumed Silica) concrete offers characteristics that will ensure long term durability and service life.

*Higher strength concrete.
Microsilica (Fumed Silica) is used to make the high strength concrete that is often essential in major projects, such as buildings, Roads and Bridge.

These engineering applications requiring high strength concrete use Microsilica (Fumed Silica) as a cost effective means to increase compressive strength.
Ultra-high strength concrete (UHSC), typically defined as >150MPa can be achieved using higher dosages of Microsilica (Fumed Silica)

*Increased strength results from Microsilica (Fumed Silica)’s particle packing & pozzolanic reaction.
In Microsilica (Fumed Silica) concrete, the thickness of the transition zone (interface) between the cementitious paste and aggregate is reduced and the CH crystals are smaller and more randomly oriented, resulting in decreased porosity & increased interface bonding strength.

ADVANTAGES of MICROSILICA (FUMED SILICA):
*Strenght:
Compresive and flaxural strenght increased significantly

*Permeabilty:
reduced by of 10 or more

*Chloride ion penetration:
Reduced diffusion of chloride ions by a factor of 3 or more

*Reinforcement corrosion inhibitor:
Electrical resistivity increased by more than 500%

*Chemical resistance:
sinnificantly improved

*Sulphate resistance:
equivalent to or beter than sulphate resistant cement

*Alkali silica reactivity:
close to total suppression

*Abrasion resistance:
greatly incrased

*Shotcrete:
rebound reduced by 50% or more and compaction, streght and cohesion enhanced

*Durability:
dramatic incrase in service life of concrete in all aggressive/chemical/marine environments.

FEATURES CHARACTERISTICS of MICROSILICA (FUMED SILICA):
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.

HOW DOES MICROSILICA (FUMED SILICA) WORK?
Due to its very small particle size (over 100 times finer than cement) and high SiO2 content, Microsilica (Fumed Silica) is a highly reactive pozzolan.
This means it will react with the calcium hydroxide [Ca(OH)2] produced when cement hydrates.

The small particle size means that the Microsilica (Fumed Silica) fills the spaces between the cement grains, improving the rheology of the mix and reducing the voids in the concrete.
The ‘pozzolanic reaction’ with the Ca(OH)2 increases the amount of calcium silicate hydrates (CSH) produced, which intensifies the bond to the aggregates and improves the homogeneity of the mix, reducing porosity and permeability and increasing the strength.

“High Performance Concrete” is usually designed to incorporate Microsilica (Fumed Silica), and sometimes other pozzolans, to achieve targeted characteristics for the structure being built.

These can be flow or pumping performance, or enhanced durability, such as increased toughness, increased resistance to abrasion, to corrosion and chemicals, and life-cycle cost efficiencies.

Highway bridges, parking decks, marine structures and bridge deck overlays are subject to constant deterioration caused by reinforcing steel corrosion, abrasion and chemical attack.

Microsilica (Fumed Silica) will protect concrete against de-icing salts, seawater and abrasion from road traffic.
Reinforcing steel corrosion and concrete deterioration are virtually eliminated, minimizing maintenance costs.

PRODUCTION of MICROSILICA (FUMED SILICA):
Overview of Facility.
Capture as-produced Microsilica by bag house.
After being collected over the furnace, the Microsilica must be transferred, cooled, and physically trapped.

The large pipe on the left is bringing the Microsilica (Fumed Silica) from the furnaces.
The vertical elements are cyclones that are used to remove oversize and other unwanted materials.

The large building is the bag house where the fume is captured.
densification-silo.
Densification silo.

Densification silo for production of densified form of Microsilica (Fumed Silica) — The as-produced fume is brought into this silo.
Compressed air is used to aerate and tumble the fume particles.

Electrostatic charges develop and cause the individual particles to agglomerate.
Once the densified Microsilica (Fumed Silica) reaches the desired bulk density, it is taken from this silo for packaging or shipping.
silo.

DENSIFICATION AND BULK DENSITY of MICROSILICA (FUMED SILICA):
According to the different degrees of densification, Microsilica (Fumed Silica) can be divided into undensified (as-produced), undensified, densified microsilica, with bulk density around 180 kg/m3, 300-360 kg/m3, 630-650 kg/m3, respectively.
Except for bulk density, there is no difference in specifications among the three types.

Densified Microsilica (Fumed Silica) is commonly used in construction like ready-mixed concrete, while undensified silica fume is often used in refractory, shotcrete, fertilizer.
Because the as-produced Microsilica (Fumed Silica) has a lower density, its transport cost is higher.

THE DIFFERENCE BETWEEN FUMED SILICA AND MICROSILICA (FUMED SILICA):
Fumed silica, also known as fumed white carbon black, is one of the extremely important high-tech ultra-fine inorganic new materials.
It is porous, non-toxic, odorless, pollution-free, and resistant to high temperatures.

At the same time, its chemical inertness and special thixotropic properties can significantly improve the tensile strength, tear resistance and wear resistance of rubber products, and the strength of rubber can be improved by dozens of times.

Rheology and thixotropy control of liquid systems, adhesives, polymers, etc., used as an additive for anti-settling, thickening, and anti-sag, reinforcement of HCR and RTV-2K silicone rubber, can be used to adjust free flow And as an anti-caking agent to improve powder properties and so on.

Fumed silica is a white, non-toxic, odorless, amorphous inorganic fine chemical product.
The atomic particle size is 7-40 nanometers, and the specific surface area is 70-400m/g.
It has many functions such as reinforcement, thickening, thixotropy, extinction, anti-ultraviolet and sterilization.

Microsilica (Fumed Silica) (also known as "silica fume", Microsilica or Silica Fume), is an amorphous, Powdered silicon dioxide (Sio2).
The average particle size of Microsilica (Fumed Silica) is 0.1-0.15 μm (micron), which is a few hundredth of the average particle size of cement.
The specific surface area is 15 -27 m2/g, and it has extremely strong surface activity.

PHYSICAL and CHEMICAL PROPERTIES of MICROSILICA (FUMED SILICA):
Appearance: White, odorless amorphous powder (branched chain network)
Particle size: Primary particles ~5–50 nm; agglomerated structures form porous chains;
BET surface area ≈ 175–225 m²/g for Aerosil 200 grade
Bulk density: ~160–190 kg/m³ (0.16–0.19 g/cm³)
Loss on drying: ≤ 1.5 % at 105 °C
pH: ~3.7–4.5 in 4 % aqueous dispersion (≈ 40 g/L)
Melting point: ~1,600 °C; Boiling / decomp: ~2,200 °C (no volatilization under normal use)
Density (solid silica): ~2.2 g/cm³
Solubility: Insoluble in water or organic solvents (as inorganic silica)

Stability: Chemically stable, non-reactive; avoid extreme heat and strong acids/bases that may degrade structure
Appearance: White amorphous powder, odorless
CAS Number / EC Number: 7631‑86‑9 (112945‑52‑5) / 231‑545‑4
Formula: SiO₂ (synthetic amorphous silica)
Particle Size: 5–50 nm primary; aggregated structure
Surface Area (BET): 175–225 m²/g (Aerosil 200 grade)
Bulk Density: ~160–190 kg/m³ (~0.16–0.19 g/cm³)
pH (4% dispersion): ~3.7–4.5
Melting / Boiling: ~1,600 °C / ~2,200 °C
Solubility: Insoluble in water and organics

Stability: Chemically stable; avoid heat/strong acids/bases
Key Properties: Thixotropy, rheology control, thickening, free-flow aid
Applications: Coatings, cosmetics, adhesives, pharmaceuticals, construction
Safety Measures: Dust control, PPE, ventilation
Storage: Dry, sealed, cool; shelf life ~2 yrs
Disposal: Inert inorganic disposal; follow local rules
Physical state: powder
Color: No data available
Odor: odorless

Melting point/freezing point: Melting point/ range: ca.1.700 °C
Initial boiling point and boiling range: 2.200 °C at 1.013,25 hPa
Flammability (solid, gas): No data available
Upper/lower flammability or explosive limits: No data available
Flash point: Not applicable
Autoignition temperature: No data available
Decomposition temperature: > 2.000 °C
pH: 3,6 - 4,3 at 40 g/l
Viscosity: Viscosity, kinematic: No data available

Viscosity, dynamic: No data available
Water solubility: 0,001 g/l at 20 °C - insoluble
Partition coefficient: n-octanol/water: No data available
Vapor pressure: No data available
Density: No data available
Relative density: No data available
Relative vapor density: No data available
Particle characteristics: No data available
Explosive properties: No data available

Oxidizing properties: none
Other safety information: Bulk density 0,05 g/cm3
Molecular Formula / Molecular Weight: SiO2 = 60.08
Physical State (20 deg.C): Solid
Storage Temperature: Room Temperature (Recommended in a cool and dark place, <15°C)
CAS RN: 7631-86-9
Reaxys Registry Number: 6114654
Merck Index (14): 8493
MDL Number: MFCD00149856

FIRST AID MEASURES of MICROSILICA (FUMED SILICA):
-Description of first-aid measures
*General advice:
Show this material safety data sheet to the doctor in attendance.
*If inhaled:
After inhalation:
Fresh air.
*In case of skin contact:
Take off immediately all contaminated clothing.
Rinse skin with
water/ shower.
*In case of eye contact:
After eye contact:
Rinse out with plenty of water.
Call in ophthalmologist.
Remove contact lenses.
*If swallowed:
After swallowing:
Immediately make victim drink water (two glasses at most).
Consult a physician.
-Indication of any immediate medical attention and special treatment needed.
No data available

ACCIDENTAL RELEASE MEASURES of MICROSILICA (FUMED SILICA):
-Environmental precautions:
Do not let product enter drains.
-Methods and materials for containment and cleaning up:
Cover drains.
Collect, bind, and pump off spills.
Observe possible material restrictions.
Take up dry.
Dispose of properly.
Clean up affected area.

FIRE FIGHTING MEASURES of MICROSILICA (FUMED SILICA):
-Extinguishing media:
*Suitable extinguishing media:
Carbon dioxide (CO2)
Foam
Dry powder
*Unsuitable extinguishing media:
For this substance/mixture no limitations of extinguishing agents are given.
-Further information:
Prevent fire extinguishing water from contaminating surface water or the ground water system.

EXPOSURE CONTROLS/PERSONAL PROTECTION of MICROSILICA (FUMED SILICA):
-Control parameters:
--Ingredients with workplace control parameters:
-Exposure controls:
--Personal protective equipment:
*Eye/face protection:
Use equipment for eye protection.
Safety glasses
*Body Protection:
protective clothing
*Respiratory protection:
Recommended Filter type: Filter A
-Control of environmental exposure:
Do not let product enter drains.

HANDLING and STORAGE of MICROSILICA (FUMED SILICA):
-Conditions for safe storage, including any incompatibilities:
*Storage conditions:
Tightly closed.
Dry.

STABILITY and REACTIVITY of MICROSILICA (FUMED SILICA):
-Chemical stability:
The product is chemically stable under standard ambient conditions (room temperature).
-Possibility of hazardous reactions:
No data available