Quick Search
Micro Silica is a highly reactive, ultrafine amorphous silica material widely used as a performance-enhancing additive in concrete, refractories, polymers, and industrial formulations.
Micro Silica improves strength, durability, and chemical resistance due to its extremely fine particle size and high pozzolanic activity.
Micro Silica enhances the microstructure of cementitious systems by filling voids and reacting with calcium hydroxide to form additional C-S-H gel.
Micro Silica is valued for its ability to increase density, reduce permeability, and improve long-term mechanical properties.
CAS Number: 69012-64-2
EC Number: 273-761-1
Molecular Formula: SiO₂
Molecular Weight: 60.08 g/mol
Synonyms: Silica fume, Amorphous silica, Ultrafine silica, Condensed silica fume, Micro-fine silica, Reactive silica, Silica dust, Pozzolanic silica, Industrial micro silica, High-reactivity silica, Micro Silica, Microsilica, Silica Fume, Condensed Silica Fume, Amorphous Silica, Amorphous Silicon Dioxide, Ultrafine Silica, Ultrafine Silicon Dioxide, Silicon Dioxide Fume, Silica Dust, Silica Powder, Silica Fine Powder, Silica Ultrafine Powder, Silica Nanopowder (Non-nano classification), Micronized Silica, High Reactivity Amorphous Silica, HR Silica, Densified Silica Fume, Undensified Silica Fume, Densified Microsilica, Undensified Microsilica, Silica Fume Grade 920, Silica Fume Grade 940, Silica Fume Grade 955, Silica Fume Pozzolan, Silica Pozzolan, Concrete Grade Silica Fume, Cement Additive Silica Fume, Concrete Additive Micro Silica, Cement Mineral Admixture Silica Fume, Supplementary Cementitious Material (SCM) Silica Fume, Concrete Modifier Micro Silica, Concrete Strength Additive Silica, Micro Silica Admixture, Micro Silica Additive, Micro Silica Cement Enhancer, Micro Silica Pozzolanic Material, Pozzolanic Silica, Siliceous Fume, Silicon Metal Fume, Ferrosilicon Fume, FeSi Fume, Silica Fume Binder Enhancer, Silica Fume High Strength Additive, Silica Fume Densifier, Silica Fume Water Reducer, Silica Fume Durability Enhancer, Micro Silica Abrasion Resistance Agent, Micro Silica Corrosion Resistance Additive, Micro Silica Shotcrete Additive, Micro Silica Refractory Grade, Refractory Silica Fume, Micro Silica Refractory Binder, Micro Silica Fill Material, Micro Silica Industrial Additive, Micro Silica Filler, Micro Silica Functional Powder.
APPLICATIONS
Micro Silica is used in high-strength concrete.
Micro Silica increases compressive and flexural strength.
Micro Silica enhances hardened concrete density.
Micro Silica is used in shotcrete.
Micro Silica improves adhesion and reduces rebound.
Micro Silica increases durability in tunnels and mines.
Micro Silica is used in ultra-high-performance concrete (UHPC).
Micro Silica contributes to exceptionally low permeability.
Micro Silica supports production of advanced structural elements.
Micro Silica is used in precast concrete products.
Micro Silica speeds up strength development.
Micro Silica improves surface finish and resistance to cracking.
Micro Silica is used in refractory castables.
Micro Silica enhances thermal shock resistance.
Micro Silica reduces porosity in high-temperature applications.
Micro Silica is used in oil-well cementing.
Micro Silica improves downhole slurry density.
Micro Silica enhances long-term integrity in harsh environments.
Micro Silica is used in chemical-resistant flooring.
Micro Silica improves abrasion resistance.
Micro Silica reduces chemical penetration.
Micro Silica is used in waterproofing mortars.
Micro Silica reduces capillary absorption.
Micro Silica enhances moisture barrier performance.
Micro Silica is used in polymer composites.
Micro Silica improves mechanical reinforcement.
Micro Silica enhances dimensional stability.
Micro Silica is used in sealants and adhesives.
Micro Silica strengthens bonding formulations.
Micro Silica modifies rheology and viscosity.
Micro Silica is used in ceramic products.
Micro Silica improves density and structural integrity.
Micro Silica enhances sintering behavior.
Micro Silica is used in floor screeds.
Micro Silica increases wear resistance.
Micro Silica reduces shrinkage and cracking.
Micro Silica is used in high-performance concrete.
Micro Silica improves compressive strength in concrete structures.
Micro Silica reduces permeability and enhances durability.
Micro Silica is used in shotcrete applications.
Micro Silica increases adhesion and reduces rebound loss.
Micro Silica improves tunnel and mining construction performance.
Micro Silica is used in marine concrete.
Micro Silica enhances resistance to chloride penetration.
Micro Silica extends service life in coastal structures.
Micro Silica is used in oil-well cementing.
Micro Silica stabilizes cement slurry at high temperatures.
Micro Silica improves resistance to sulfate attack in downhole systems.
Micro Silica is used in precast concrete manufacturing.
Micro Silica provides higher early-age strength.
Micro Silica enables thinner, lighter, and stronger precast elements.
Micro Silica is used in self-compacting concrete.
Micro Silica enhances flowability and reduces segregation.
Micro Silica improves surface finish quality.
Micro Silica is used in refractory castables.
Micro Silica increases density and reduces porosity in refractories.
Micro Silica improves thermal shock resistance in high-temperature equipment.
Micro Silica is used in fiber-reinforced concrete.
Micro Silica enhances bonding between fibers and cement matrix.
Micro Silica improves tensile and flexural strength.
Micro Silica is used in grouts.
Micro Silica reduces bleeding and segregation in grouting applications.
Micro Silica increases long-term stability of grout mixtures.
Micro Silica is used in waterproofing systems.
Micro Silica reduces capillary absorption in concrete.
Micro Silica enhances resistance to water ingress.
Micro Silica is used in industrial flooring.
Micro Silica increases abrasion resistance in heavy-duty floors.
Micro Silica minimizes dusting and surface wear.
Micro Silica is used in UHPC (ultra-high-performance concrete).
Micro Silica contributes to extremely low porosity.
Micro Silica improves ductility and load-bearing capacity.
Micro Silica is used in mortar formulations.
Micro Silica increases strength and bond performance in repair mortars.
Micro Silica enhances durability in thin-layer applications.
Micro Silica is used in chemical-resistant concrete.
Micro Silica improves resistance to acidic and aggressive environments.
Micro Silica supports long-term integrity in industrial plants.
DESCRIPTION
Micro Silica is an extremely fine, amorphous powder with particle sizes around 0.1 microns.
Micro Silica appears as a gray or white ultrafine dust depending on production source.
Micro Silica has a very high specific surface area.
Micro Silica is a byproduct of silicon and ferrosilicon alloy production.
Micro Silica is collected using high-efficiency filtration systems.
Micro Silica is composed predominantly of amorphous SiO₂.
Micro Silica exhibits high pozzolanic reactivity.
Micro Silica reacts with calcium hydroxide in cementitious systems.
Micro Silica forms additional C-S-H gel, improving performance.
Micro Silica improves mechanical strength and durability.
Micro Silica reduces chloride penetration and chemical attack.
Micro Silica minimizes carbonation and sulfate damage.
Micro Silica is non-crystalline and does not contain significant crystalline silica.
Micro Silica is stable and non-flammable.
Micro Silica is compatible with most cement and polymer systems.
PROPERTIES
Appearance: Ultrafine gray or white powder
Odor: Odorless
Composition: Amorphous silicon dioxide
Particle Size: ~0.1 microns
Bulk Density: 200–700 kg/m³ (depending on densification)
Surface Area: High (15–30 m²/g typical)
Melting Point: ~1600°C
Solubility: Insoluble in water; dispersible in mixtures
pH (slurry): Slightly acidic to neutral
Pozzolanic Activity: Very high
Thermal Stability: Excellent
FIRST AID
Inhalation:
Move to fresh air if dust is inhaled.
Seek medical attention if respiratory irritation persists.
Skin Contact:
Wash with soap and water.
Seek medical help if irritation occurs.
Eye Contact:
Rinse eyes thoroughly with water.
Seek medical care if irritation continues.
Ingestion:
Rinse mouth and drink water.
Low toxicity; seek medical help if discomfort develops.
Note to Physicians:
Treat symptomatically; dust inhalation may irritate airways.
HANDLING AND STORAGE
Handling:
Avoid generating airborne dust.
Wear protective masks and gloves when handling in bulk.
Ventilation:
Use local exhaust ventilation to control dust exposure.
Avoidance:
Avoid inhalation of fine particles.
Prevent contamination with moisture during storage.
Spill Procedures:
Sweep or vacuum using dust-control methods.
Do not use compressed air.
Storage:
Store in a cool, dry area.
Keep bags sealed to avoid moisture uptake.
Protect from humidity and contamination.
