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Microsilica Powder, also known as silica fume, is a byproduct of the production of silicon and ferrosilicon alloys.
Microsilica Powder is composed of ultra-fine, amorphous silicon dioxide particles, typically less than 1 micron in diameter.
Microsilica Powder is widely used as a pozzolanic material in concrete, improving strength, durability, and chemical resistance.
CAS Number: 69012-64-2
EC Number: 273-761-1
Molecular Formula: SiO₂
Molecular Weight: ~60.08 g/mol
Synonyms: Microsilica, Silica Fume, Amorphous Silica, Condensed Silica Fume, Silica Dust, Ultrafine Silica, Fumed Silica (Industrial), Silicon Dioxide (Amorphous), Densified Silica Fume, Silica Fume Powder, High-Performance Silica, Reactive Silica, Pozzolanic Silica, Silica Fume Additive
APPLICATIONS
Microsilica Powder is used as a pozzolanic additive in high-performance concrete to increase compressive and tensile strength.
Microsilica Powder enhances the durability of concrete by reducing permeability and improving resistance to sulfate attack and chloride ingress.
Microsilica Powder is employed in bridge decks, parking structures, and marine applications for long-lasting concrete performance.
Microsilica Powder is used in refractory materials to improve density, strength, and thermal shock resistance.
Microsilica Powder is included in castables, gunning mixes, and other high-temperature resistant formulations.
Microsilica Powder helps reduce porosity and improves the service life of refractory linings in furnaces and kilns.
Microsilica Powder is applied in oil well cementing to enhance strength and reduce permeability in deep well environments.
Microsilica Powder is used in grouting operations and tunnel linings to improve bonding and mechanical properties.
Microsilica Powder improves the rheological behavior and thixotropy of cement slurries.
Microsilica Powder is utilized in the rubber and plastic industries as a reinforcing filler for improved tensile strength and tear resistance.
Microsilica Powder increases the thermal stability and flame resistance of polymeric compounds.
Microsilica Powder provides a fine texture and smooth surface finish in molded plastic and rubber goods.
Microsilica Powder is incorporated into coatings and sealants to enhance abrasion resistance and mechanical properties.
Microsilica Powder is used in epoxy formulations to control viscosity and improve adhesion.
Microsilica Powder contributes to corrosion-resistant coatings for metals and infrastructure.
Microsilica Powder is used in asphalt and road construction to increase strength, wear resistance, and freeze-thaw durability.
Microsilica Powder is included in sprayed concrete (shotcrete) for slope stabilization and tunnel lining.
Microsilica Powder improves the bonding of sprayed layers and reduces rebound loss.
Microsilica Powder is used in the electronics industry as a filler in insulating materials and semiconductor encapsulants.
Microsilica Powder enhances the dielectric strength and dimensional stability of electronic components.
Microsilica Powder provides thermal resistance and moisture protection in sensitive assemblies.
Microsilica Powder is utilized in ceramic formulations to improve sintering behavior and reduce firing temperatures.
Microsilica Powder enhances surface smoothness and mechanical strength in ceramic bodies.
Microsilica Powder reduces thermal expansion, improving dimensional control in precision ceramics.
Microsilica Powder is used in environmental applications for the immobilization of heavy metals and toxic elements.
Microsilica Powder aids in the stabilization of contaminated soils and the treatment of industrial waste streams.
Microsilica Powder contributes to the development of eco-friendly construction materials with recycled components.
Microsilica Powder is applied in 3D printing and additive manufacturing for creating cement-based printable composites.
Microsilica Powder improves print resolution, surface finish, and curing performance in printed parts.
Microsilica Powder is compatible with geopolymer and alkali-activated binders for innovative construction materials.
Microsilica Powder is used as a pozzolanic additive in high-performance concrete.
Microsilica Powder is added to cement mixtures to increase compressive strength.
Microsilica Powder is used in refractory castables to improve thermal resistance.
Microsilica Powder is employed in bridge construction to enhance durability.
Microsilica Powder is used in marine structures to reduce chloride permeability.
Microsilica Powder is added to tunnel linings for increased abrasion resistance.
Microsilica Powder is used in dam construction to improve waterproofing.
Microsilica Powder is applied in oil well cementing to reduce permeability.
Microsilica Powder is used in precast concrete elements to improve finish quality.
Microsilica Powder is used in industrial flooring for its resistance to chemical attack.
Microsilica Powder is added to shotcrete for better cohesion and adhesion.
Microsilica Powder is employed in nuclear waste containment barriers.
Microsilica Powder is used in repair mortars to enhance bond strength.
Microsilica Powder is included in high-strength grouts for structural anchoring.
Microsilica Powder is used in high-rise buildings to reduce structural weight.
Microsilica Powder is applied in airport runways to increase surface hardness.
Microsilica Powder is used in hydropower projects for reduced porosity.
Microsilica Powder is added to concrete pipes for enhanced durability.
Microsilica Powder is used in chemical plants for acid-resistant floors.
Microsilica Powder is employed in water tanks to reduce micro-cracking.
Microsilica Powder is used in parking structures to extend service life.
Microsilica Powder is added to highway pavements to increase fatigue resistance.
Microsilica Powder is used in railway sleepers for strength and stability.
Microsilica Powder is employed in retaining walls to reduce permeability.
Microsilica Powder is used in architectural precast panels for smooth texture.
Microsilica Powder is applied in wind turbine bases for added strength.
Microsilica Powder is used in silos and storage tanks to improve lining materials.
Microsilica Powder is used in subway construction to reduce water ingress.
Microsilica Powder is added to sewage systems to resist corrosive gases.
Microsilica Powder is used in blast furnace linings for thermal shock resistance.
Microsilica Powder is used in aluminum plants for molten metal containment.
Microsilica Powder is employed in cementitious coatings for protective barriers.
Microsilica Powder is added to fire-resistant cladding systems.
Microsilica Powder is used in high-temperature insulation panels.
Microsilica Powder is employed in vacuum-formed refractories for better workability.
Microsilica Powder is used in lightweight refractory aggregates.
Microsilica Powder is used in castable gunning mixes for durability.
Microsilica Powder is applied in ladle and tundish linings in steel plants.
Microsilica Powder is used in kiln linings to resist high-temperature corrosion.
Microsilica Powder is used in pipe coating for subsea applications.
Microsilica Powder is used in grouting for windmill foundation anchorage.
Microsilica Powder is applied in wear-resistant linings of chutes and hoppers.
Microsilica Powder is used in ceramic fiber boards for added strength.
Microsilica Powder is added to refractory bricks to improve density.
Microsilica Powder is employed in quartz composite products for increased stiffness.
Microsilica Powder is used in geopolymer concrete formulations.
Microsilica Powder is added to magnesium phosphate cements for stabilization.
Microsilica Powder is used in electrochemical applications as a dielectric filler.
Microsilica Powder is applied in printed circuit board insulation coatings.
Microsilica Powder is used in specialty glass manufacturing for fining properties.
DESCRIPTION
Microsilica Powder is a light to medium gray, amorphous powder composed of extremely fine silicon dioxide particles.
Microsilica Powder is formed during the high-temperature reduction of quartz in electric arc furnaces used in the production of silicon alloys.
Microsilica Powder is highly reactive and exhibits pozzolanic activity, reacting with calcium hydroxide to form stable cementitious compounds.
Microsilica Powder has a specific surface area of 15,000 to 30,000 m²/kg, which contributes to its high reactivity in cementitious systems.
Microsilica Powder improves the microstructure of concrete by filling voids between cement grains, resulting in denser and more durable matrices.
Microsilica Powder also contributes to reduced bleeding and increased cohesion in fresh concrete.
Microsilica Powder is a highly reactive pozzolanic material composed of amorphous silicon dioxide.
Microsilica Powder is a by-product of silicon and ferrosilicon alloy production.
Microsilica Powder appears as an ultrafine, gray powder with high surface area.
Microsilica Powder consists of spherical particles with a diameter of less than 1 micron.
Microsilica Powder increases the density and strength of concrete and mortars.
Microsilica Powder significantly reduces permeability and enhances chemical resistance.
Microsilica Powder is compatible with most Portland cement-based formulations.
Microsilica Powder improves the durability and service life of civil engineering structures.
Microsilica Powder is used in high-temperature environments due to its thermal stability.
Microsilica Powder meets ASTM C1240 standards for use in concrete admixtures.
Microsilica Powder is available in densified and undensified forms, with the densified variant being easier to handle and transport.
Microsilica Powder is non-toxic and inert under normal conditions, though fine particles may cause dust-related irritation.
Microsilica Powder is widely recognized for its performance-enhancing properties in construction and materials science applications.
Microsilica Powder is used globally to produce high-strength concrete for infrastructure, industrial floors, and precast elements.
Microsilica Powder improves the fire resistance and durability of concrete exposed to aggressive environments.
Microsilica Powder is a cost-effective solution for increasing the service life of structures while reducing maintenance costs.
PROPERTIES
Chemical Formula: SiO₂
Molecular Weight: ~60.08 g/mol
Common Name: Microsilica Powder
Appearance: Light gray to dark gray amorphous powder
Odor: Odorless
Density: ~2.2 g/cm³ (bulk density varies with densification)
Particle Size: Typically <1 µm (average 0.1–0.3 µm)
Surface Area: 15,000–30,000 m²/kg
Melting Point: ~1,710°C
Solubility: Insoluble in water
Reactivity: Reacts with calcium hydroxide (pozzolanic)
pH: ~7 (in aqueous dispersion)
Chemical Stability: Stable under recommended storage conditions
Storage Conditions: Store in a dry, well-ventilated area, sealed against moisture
FIRST AID
Inhalation:
Remove the person from exposure to fresh air.
Seek medical attention if respiratory irritation persists.
Use respiratory protection in high-dust environments.
Skin Contact:
Wash affected area with mild soap and water.
Seek medical attention if irritation develops.
Use gloves when handling the powder to minimize skin contact.
Eye Contact:
Flush eyes with clean water for at least 15 minutes.
Seek medical attention if irritation or redness persists.
Avoid rubbing eyes to prevent mechanical abrasion.
Ingestion:
Ingestion is unlikely in normal use.
If swallowed, rinse mouth thoroughly and seek medical advice.
Do not induce vomiting unless advised by medical personnel.
Note to Physicians:
Treat symptomatically.
Avoid further exposure to dust.
HANDLING AND STORAGE
Handling:
Use appropriate PPE, including dust masks, goggles, and gloves.
Minimize dust generation and airborne dispersion during handling.
Wash hands thoroughly after handling the product.
Ventilation:
Ensure adequate local and general ventilation to minimize inhalation exposure.
Use dust extraction systems if handling in bulk or enclosed spaces.
Avoidance:
Avoid contact with eyes and prolonged inhalation of dust.
Do not eat, drink, or smoke in work areas where Microsilica is handled.
Spill and Leak Procedures:
Sweep or vacuum up using HEPA-filter equipment.
Avoid dry sweeping that may cause airborne dust.
Dispose of in accordance with local environmental regulations.
Storage:
Store in tightly sealed containers in a dry environment.
Avoid exposure to moisture, which may affect reactivity.
Keep away from incompatible materials such as strong oxidizers.
Handling Cautions:
Do not reuse empty containers unless properly cleaned.
Avoid accumulation of dust on surfaces—may pose a fire hazard in confined areas.
