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Microsilica is an ultrafine powder collected as a by-product of the silicon and ferrosilicon alloy production and consists of spherical particles with an average particle diameter of 150 nm.
Microsilica is sometimes confused with fumed silica (also known as pyrogenic silica, CAS number 112945-52-5).
Microsilica is composed almost entirely of amorphous (non-crystalline) silicon dioxide (SiO₂), and appears as an ultrafine, grey powder with particles approximately 100 times smaller than the average cement grain.
CAS Number: 7631-86-9
Molecular Formula: O2Si
Molecular Weight: 60.08
EINECS Number: 231-545-4
Synonyms: Silicon Dioxide, Silica, Dioxosilane, Quartz, 7631-86-9, Silica gel, Cristobalite, Silicic anhydride, Tridymite, 14808-60-7, Sand, 112945-52-5, 61790-53-2, 112926-00-8, KIESELGUHR, Diatomaceous silica, Wessalon, Aerosil, Silicon(IV) oxide, Zorbax sil, 60676-86-0, Silica, amorphous, 14464-46-1, Dicalite, Ludox, Nyacol, Amorphous silica, QUARTZ (SIO2), Cristobalite (SiO2), Cab-O-sil, Sillikolloid, Extrusil, Santocel, Sipernat, Superfloss, Acticel, Carplex, Neosil, Neosyl, Porasil, Silikil, Siloxid, Zipax, Aerosil-degussa, Silicon oxide, Aerosil 380, Synthetic amorphous silica, Quartz sand, Rose quartz, Silica particles, 91053-39-3, Cab-o-sil M-5, Silica, fumed, Snowtex O, Silica, colloidal, Tokusil TPLM, Dri-Die, SILICA, VITREOUS, Manosil vn 3, Colloidal Silicon Dioxide, Ultrasil VH 3, Ultrasil VN 3, Aerosil bs-50, Carplex 30, Carplex 80, Snowtex 30, Zeofree 80, Aerosil,Silicon(IV) oxide, Zorbax sil, 60676-86-0, Silica, amorphous, 14464-46-1, Dicalite, Ludox, Nyacol, Amorphous silica, QUARTZ (SIO2), Cristobalite (SiO2), Cab-O-sil, Sillikolloid, Extrusil, Santocel, Sipernat, Superfloss, Acticel, Carplex, Neosil, Neosyl, Porasil, Silikil, Siloxid, Zipax, Aerosil-degussa, Silicon oxide, Aerosil 380, Synthetic amorphous silica, Quartz sand, Rose quartz, Silica particles, 91053-39-3, Cab-o-sil M-5, Silica, fumed, Snowtex O, Silica, colloidal, Tokusil TPLM, Dri-Die, SILICA, VITREOUS, Manosil vn 3, Colloidal Silicon Dioxide, Ultrasil VH 3, Ultrasil VN 3, Aerosil bs-50, Carplex 30, Carplex 80, Snowtex 30, Zeofree 80, Aerosil K 7, Cabosil N 5, Syton 2X, Amorphous silica gel, Positive sol 232, Siliziumdioxid, Aerogel 200, Aerosil 300, Chalcedony, Diatomite, Ludox hs 40, Silanox 101, Silica (SiO2), Vitasil 220, Agate, Positive sol 130M, Silica vitreous, Silicon Dioxide (amorphous), Aerosil A 300, Aerosil E 300, Aerosil M-300, colloidal silica, Fused silica, Microsilica, Silica slurry, Silicon Dioxide, fumed, Silicone dioxide, 68855-54-9, Nalfloc N 1050, Quso 51, Silica, amorphous fused, Nalco 1050, Quso G 30, Hydrophobic silica 2482, Kieselsaeureanhydrid, Min-U-Sil, 15468-32-3, SiO2, CCRIS 3699, Silica Gel, 40-63 Micron Particles, Silica aerogel, (SiO2)n, UNII-ETJ7Z6XBU4, ETJ7Z6XBU4, Silicon Dioxide, Amorphous, Silica 2482, hydrophobic, Silicon Dioxide, chemically prepared, EINECS 231-545-4, CAB-O-SIL N-70TS, EPA Pesticide Chemical Code 072605, CI 7811,Aerosil 200, 99439-28-8, CHEBI:30563, AI3-25549, Crystalline silica, N1030, U 333, Silica gel 60, 230-400 mesh, Glass, Silicon Dioxide, colloidal, 15723-40-7, ENT 25,550, [SiO2], Silica, crystalline - fused, Silicagel, Silica gel, pptd.,cryst.-free, 13778-37-5, 13778-38-6, 17679-64-0, Christensenite, Crystoballite, Silica gel desiccant, indicating, Celite, INS-551, Calcined diatomite, MFCD00011232, MFCD00217788, Silica, amorphous,fumed, cryst.-free, Silica, mesostructured, Amethyst, Aquafil, Cataloid, Crysvarl, Flintshot, Nalcoag, Novaculite, Silikill, Vulkasil, Cherts, Snowit, Imsil, Metacristobalite, Quartz silica, alpha-Quartz, Fossil flour, Fumed silica, Quartz dust, Rock crystal, Silica dust, White carbon, SIMETHICONE COMPONENT Silicon Dioxide, Chromosorb P, Tiger-eye, E-551, Vulkasil S, Celite superfloss, Cristobalite dust, Corasil II, Silver bond B, Cab-O-sperse, alpha-Cristobalite, alpha-Crystobalite, Gold bond R, (SiO2), Cabosil st-1, Silica Standard: SiO2 @ 100 microg/mL in H2O, Sil-Co-Sil, Silica Standard: SiO2 @ 1000 microg/mL in H2O, Siderite (SiO2), Tridymite 118, Cab-O-grip II, Tridimite [French], HI-Sil, Amorphous silica dust, Silicon Oxide Hollow Nanospheres, Nyacol 830, Sibelite M 3000, Sibelite M 4000, Sibelite M 6000, Quazo puro [Italian], SILICA, AMORPHOUS (IARC), SILICA, AMORPHOUS [IARC], Caswell No. 734A, Sicron F 300, Sikron F 100, Spectrosil, Accusand, Coesite, Fuselex, Nalcast, Nyacol 1430, Optocil, Quartzine, Quarzsand, Rancosil, Suprasil, Tridimite, Siltex, Vitreous quartz, Vitreous silica, Tridymite dust, W 12 (Filler), beta-Quartz, 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quartz, FB 20 (silica), Elsil 100, F 44 (filler), D & D, SF 35, Elsil BF 100, F 125 (silica), F 160 (silica), Fuselex RD 40-60, Silica, amorphous, fused, Silica; Silica colloidal anhydrous; Silicium dioxide, EINECS 238-455-4, EINECS 238-878-4, EINECS 239-487-1, 43-63C, HK 400, TGL 16319, Silica, crystalline quartz, Silicon Dioxide (vitreous), Silica, amorphous, fumed, cryst.-free, Silica, crystalline, quartz, Silica, crystalline: quartz, tripolite, GP 7I, Precipitated amorphous silica, Chrysoprase, Ronasphere, Silica, crystalline tridymite, Speriglass, Carneol, Citrine, Kieselgel, NaturasilScars, Sandstone, Silica, crystalline - quartz, Silicea, Spherica, AF-SO 25R, Quartz [Silica, crystalline], Siilca, Zorbax, quartz-glass, silica sand, Silicom dioxide, Silica flour (powdered crystalline silica), Silica marina, Silica, crystalline: tridymite, silica-gel, Fused-silica, pyrogenic silica, Silica,fumed, GP 11I, RD 8, silica-, Fine grain sand, QuarZ, Super-cel, Fire Agate, Greensil K, Sea sand, silica gel white, W 006, Silicon di-oxide, Tridymite [Silica, crystalline], Zelec Sil, Chrysolith 6X, CRS 1102RD8, Silica Dispersion, SiO2 Nanopowder, Silica gel G, Silica, crystalline: cristobalite, Silotrat-1, Kieselsaureanhydrid, SiO2 Nanospheres, Silica gel 60 ADAMANT(TM) on TLC plates, with fluorescent indicator 254 nm, Silicea 3X, Silicea 6C, Silicea 6X, Chrysoprase8113, EF 10, Fossil Flour MBK, FS 74, Honest-Paste Kids, MR 84, Quartz 8, Silica, crystalline - cristobalite, Silica Microspheres, Aventurine8101, Cristobalite [Silica, crystalline], Silicea Kit Refill, Sorbosil AC33, Sorbosil AC77, Sorbosil BFG50, Sorbosil TC15, Sand, white quartz, Sandstone8144, Silicea 12X, Silicea 30X, Amorphous silica: Pyrogenic (fumed), EINECS 262-373-8, Silica gel, ASTM, silicon (iv) oxide, Methyl3-oxohexanoate, Siliceous sand, CP, Sorbosil AC 35, Sorbosil AC 37, Sorbosil AC 39, BF 100, EQ 912, Neosil CBT50, Neosil CBT60, Neosil CBT60S, Neosil CBT70, Neosil CT11, Neosil PC10, Neosil PC50S, QG 100, Quartz 30, RD 120, Rose Quartz8142, AEROSIC, Aerosil 130, Aerosil 255, ARSIL, BIOSILICA, Carneol8109, Citrine8114, DALTOSIL, DUROSIL, HAIRBALLS, KOMSIL, MICROSIL, MILOWHITE, MIZUKASIL, NOVAKUP, OSCAL, PHOTOX, PREGEL, REOLOSIL, ROMSIL, SIFLOX, SILEX, SILICAFILM, SILICALITE, Silicea 200C, Silicea 200X, Silicea8012, SILIPUR, SILMOS, SIONOX, SNOWTEX, Sorbpso; BFG10, SYTON, TOSIL, UNISIL, VERTICURINE, ZEOPAN, Fire Agate8116, Tigers Eye8152, NaturasilStretch Marks, Wacker HDK H30, Celite 503, ENTERO TEKNOSAL, Spheron PL-700, AEROSIL PST, CATALOID SA, CATALOID SN, NALCAST PLW, SANTOCEL CS, SNOWTEX OXS, SORBSIL MSG, ADELITE A, ELKEM SAND, FINESIL B, FUJIGEL B, FUSELEX X, GAROSIL GB, GAROSIL N, HIMESIL A, NEOSIL XV, NEOSYL GP, NIPSIL AQ, NIPSIL ER, NIPSIL ES, NIPSIL LP, NIPSIL NA, NIPSIL NS, NIPSIL NST, SANTOCEL Z, Silicon Dioxide Powder, SILTON AK, SNOWTEX AK, SNOWTEX C, SNOWTEX N, SNOWTEX OL, TOKUSIL GU, TOKUSIL N, TOKUSIL NR, TOKUSIL P, TOKUSIL U, TOKUSIL UR, VULKASIL C, Wacker HDK T 30, Wacker HDK V 15, LUDOX LS, LUDOX TM, NEOSIL A, Sea sand, acid washed, Silica, fumed, powder, Silicon Dioxide (NF), SILTON A, SYTON FM, CRYSTALITE 5V, CRYSTALITE 5X, GLASGRAIN SG-A, IMSIL H, Neosil CL2000, Sand 50-70 mesh, Silica, Anhydrous 31, SILICEA200ck, Spheron N-2000, Spheron P-1500, TOSIL P, Cab-O-Sil EH-5, Cab-O-Sil M-5P, Cab-O-Sil MS55, F 44, NIPSIL VN3LP, Silica gel, large pore, TOKUSIL GU-N, TOKUSIL GV-N, Wacker HDK N 20P, Wacker HDK N 25P, Y 40, KAOWOOL RIGIDIZER, CRYSTALITE FM 1, CRYSTALITE NA 1, HYPERSIL 3, HYPERSIL 5, MSP-X, Silica 6 Special Order, ULTRASIL VN 3SP, Hollow Silica Nanosphere, MIZUKASIL NP 8, MIZUKASIL SK 7, Silicon Oxide Dispersion, Silicon Oxide Nanopowder, CARPLEX FPS 1, CARPLEX FPS 3, NIPSIL VN 3AQ, SI-O-LITE, SILICA [INCI], SUPERNAT 22LS, SYLOID SILICA GEL, ULTRASIL VN 2, CARPLEX CS 5, CRYSTALITE CMC 1, silica (Silicon Dioxide), silica fibers (biogenic), SILICATE [VANDF], Silicon Dioxide (silica), SUPERNAT 50S, TOKUSIL AL 1, Celite (R) 545, MIZUKASIL P 78A, MIZUKASIL P 78F, Silica gel, ACS reagent, Wacker HDK V 15 P, Celite(R) 512 medium, HYPERSIL 10, Kieselguhr, -325 mesh, NIPSIL VN 3, OPRECARE 12, OPRECARE 24, SAND [INCI], SANTOCEL 54, SANTOCEL 62, Silica, 99.8%, SILNEX NP 8, SYLOBLOC 41, SYLOBLOC 44, SYLOBLOC 46, SYLOBLOC 47, TONICPET 12, ADELITE AT 20A, ADELITE AT 20Q, ADELITE AT 30S, CATALOID HS 40, CATALOID SI 40, HARIMIC SWC 05, MIZUKASIL P 78, Quartz 60 Special Order, SBA-15 Molecular Sieve, Silica 30 Special Order, Silicon Dioxide Nanopowder, SNOWTEX NCS 30, ADELITE 30, ADELITE AT 30, AEROSIL BS 50, AEROSIL FK 60, AEROSIL OX 50, CARPLEX 67, DSSTox_CID_9677, HISILEX EF 10, Hollow Silica Microspheres, LUDOX 40HS, NIPSIL SS 50A, Silicon Dioxide Dispersion, SILTON A 2, SILTON LP 75C, SILTON R 2, SNOWTEX 40, SUPERNAT 250S, TULLANOX A 50, ZEOTHIX 95, ZORBAX PSM 60, Cab-O-Sil LM-130, AEROSIL 130V, AEROSIL 200V, CATALOID SI 350, Epitope ID:158537, FINESIL E 50, FINESIL X 37, MIZUKASIL P 526, MIZUKASIL P 527, MIZUKASIL P 801, MIZUKASIL P 802, NEOSYL 81, NIPSIL SS 10, NIPSIL SS 50, PROTEK-SORB 121, REOLOSIL 202, REOLOSIL QS 102, SIDENT 12, Silica, fumed, hydrophobic, Silicon Dioxide Nanospheres, SOLEX (M), SYLODENT 704, SYTON 30X, SYTON W 3, TULLANOX TM 500, ZEOSIL 175MP, ZEOSIL 75, ADELITE AD 321, AEROSIL A 200V, AEROSIL OK 412, AEROSIL TT 600, CAB-O-SIL HS 5, CAB-O-SIL M 5, CAB-O-SIL N 5, LUFILEN E 100, NALCOAG 1034A, Nano Silicon Dioxide Powder, NIPSIL B 220A, NIPSIL E 150J, NIPSIL E 150K, NIPSIL E 150V, NIPSIL E 200A, NIPSIL E 220A, SILCRON G 100, SILCRON G 640, Silica gel 40-60Angstoms, TIX-O-SIL 33J, TIX-O-SIL 38A, AROGEN 500, CAB-O-SIL LM 50, DSSTox_RID_78805, EMSAC 460S, EMSAC 465T, IMSIL A 10, IMSIL A 15, IMSIL A 25, NEOSYL 186, NEOSYL 224, NUCLEOSIL 100-5, QUSO WR 55, QUSO WR 82, silica gel 60g (type60), silica gel 60h (type60), SSA 1, SSK 5, SYTON W 15, SYTON W 30, SYTON X 30, ZEOSYL 100, ZEOSYL 200, CAB-O-SIL MS 75D, CAB-O-SIL N 70TS, CARPLEX 1120, CELATOM(R) FW-60, DSSTox_GSID_29677, FILLITE 52/7, IMSIL A 108H, MIN-U-SIL 15, MIN-U-SIL 30, NALCO 2SS374, NALCO CD 100, NALCOAG 1030, NALCOAG 1050, NALCOAG 1060, NALCOAG 1115, NALCOAG 1129, NALCOAG 1140, NIPSIL E 150, NIPSIL E 200, NIPSIL G 300, NYACOL 2034A, P 2 (SILICA), Pesticide Code 072605, Silicon Dioxide, acid washed, Silicon Dioxide, acid-washed, VITASIL 1500, VITASIL 1600, ZEOSYL 1000V, BS 30 (FILLER), BS 50 (SILICA), CAB-M 5, Diatomaceous earth non-washed, EP 10TP, NALFLOC N 1030, SILICA GEL [WHO-DD], Silicon Dioxide [II], Silicon(IV) oxide (SiO2), 2080 Dentistry Night Fresh, 92283-58-4, LO-VEL 24, LO-VEL 27, PHYENLIMCIDE TOOTHPASTE, Silicon Dioxide, Precipitated.
Microsilica is a byproduct from silicon metal or ferrosilicon industries,is an amorphous silicon dioxide – SiO2 which is generated as a gas in submerged electrical arc furnaces during the reduction of very pure quartz.
As the molten metal is produced, a silica-based gas is emitted.
This gaseous fume, as it rises, cools rapidly and forms extremely minute,Amorphous, spherical particles.
The microsilica is collected in a bag house, a system for filtering the hot air and gases vented from the furnace.
This gas vapor is condensed in bag house collectors as very fine powder of spherical particles that average 0.1 to 0.3 microns in diameter with a surface area of 17 to 30 m2/g.
Silica fume, also known as microsilica, (CAS number 69012-64-2, EINECS number 273-761-1) is an amorphous (non-crystalline) polymorph of silicon dioxide, silica.
However, the production process, particle characteristics and fields of application of fumed silica are all different from those of silica fume.
Microsilica, also known as silica fume, is an extremely fine by-product material that is primarily produced during the manufacture of silicon or ferrosilicon alloys in electric arc furnaces.
The main field of application is as pozzolanic material for high performance concrete.
During the high-temperature production process of silicon metals, silicon dioxide in quartz is reduced to silicon vapor, which oxidizes when it comes in contact with air.
This results in the formation of microscopic silica particles that are collected through filters.
These particles are known as microsilica or silica fume and are valued for their very high surface area and pozzolanic properties (the ability to react with calcium hydroxide to form cementitious compounds).
Microsilica is commonly used as an additive in concrete and cement-based products to enhance their properties. When added to concrete, it significantly increases compressive strength, reduces permeability, improves resistance to chemical attack (especially from chlorides and sulfates), and decreases the risk of alkali-silica reaction (ASR).
These enhancements make it especially useful in high-performance concrete for structures such as bridges, tunnels, parking garages, and marine environments.
Microsilica has high mechanical strength, high temperature resistance, and low coefficient of thermal expansion, excellent thermal shock resistance, good chemical stability, high dielectric strength and small refractive index.
Microsilica has excellent property for being penetrated by light at the range of ultraviolet, visible and infrared light regions.
It has excellent low or high temperature insulation performance;
Microsilica is a silicon oxide made up of linear triatomic molecules in which a silicon atom is covalently bonded to two oxygens.
The first testing of silica fume in Portland-cement-based concretes was carried out in 1952.
The biggest drawback to exploring the properties of silica fume was a lack of material with which to experiment.
Early research used an expensive additive called fumed silica, an amorphous form of silica made by combustion of silicon tetrachloride in a hydrogen-oxygen flame.
Microsilica on the other hand, is a very fine pozzolanic, amorphous material, a by-product of the production of elemental silicon or ferrosilicon alloys in electric arc furnaces.
Before the late 1960s in Europe and the mid-1970s in the United States, silica fumes were simply vented into the atmosphere.
With the implementation of tougher environmental laws during the mid-1970s, silicon smelters began to collect the silica fume and search for its applications.
The early work done in Norway received most of the attention, since it had shown that Portland cement-based-concretes containing silica fumes had very high strengths and low porosities.
Since then the research and development of silica fume made it one of the world's most valuable and versatile admixtures for concrete and cementitious products.
Microsilica is an ultrafine material with spherical particles less than 1 μm in diameter, the average being about 0.15 μm.
This makes it approximately 100 times smaller than the average cement particle.
The bulk density of silica fume depends on the degree of densification in the silo and varies from 130 (undensified) to 600 kg/m3.
The specific gravity of silica fume is generally in the range of 2.2 to 2.3.
The specific surface area of silica fume can be measured with the BET method or nitrogen adsorption method.
Microsilica typically ranges from 15,000 to 30,000 m2/kg.
Microsilica, also known as silica fume, which is a by-product of producing silicon metal or ferro-silicon metal.
Microsilica is collected from the flue gases from electric arc furnaces.
Microsilica is a highly reactive pozzolanic powder and it is more important for the concrete industry.
Microsilica is an extremely fine powder and it is commonly used in concrete structures that need a high degree of impermeability or required high-strength in concrete.
Microsilica is now used in more & more projects wherever durability & strength is the prime concern.
Microsilica can also improve the packing density of concrete and reduce the amount of bleeding (water rising to the surface), leading to a more cohesive and durable mix.
However, due to its powdery nature, special care is required in handling and mixing to avoid dust generation and ensure uniform dispersion in the concrete mixture.
Microsilica powder is composed of ultra fine solid spherical particles of amorphous silica each approximately 100 times smaller than a cement grain.
It is formed by the condensation of vapour during the smelting of coal, quartz, iron ore and other materials in an electric arc furnace at around 2000.
The vapour and furnace gasses travel through a heat exchange system at the end of which the by now solid particles of amorphous silica are separated from the gases via a bag filter system.
In the field of construction and civil engineering, microsilica is most widely used as a supplementary cementitious material (SCM) in high-performance concrete.
When added to a concrete mix, microsilica interacts with calcium hydroxide, a by-product of cement hydration, through a pozzolanic reaction.
This reaction forms additional calcium silicate hydrate (C-S-H), the main strength-giving compound in concrete.
As a result, the concrete becomes denser, more durable, and significantly stronger, both in terms of compressive and flexural strength.
Microsilica-modified concrete also has much lower permeability, which means it is more resistant to the penetration of water, chloride ions, and other harmful substances.
This property is especially valuable in aggressive environments such as marine structures, tunnels, bridges, offshore platforms, and industrial floors, where durability and corrosion resistance are critical.
Melting point: 1610 °C (lit.)
Boiling point: 2950 °C
Density: 2.6 g/mL at 25 °C (lit.)
Refractive index: n20/D 1.544 (lit.)
Storage temperature: Room temperature
Solubility: Insoluble in water and acid solutions; soluble in HF
Form: Rod (1/8")
Color: Off‑white
InChI: InChI=1S/O2Si/c1-3-2
InChIKey: VYPSYNLAJGMNEJ-UHFFFAOYSA-N
SMILES: Si=O
Microsilica, also called silica fume, is a highly reactive pozzolanic material composed of ultra-fine particles of amorphous (non-crystalline) silicon dioxide.
Microsilica is typically produced as a by-product during the production of silicon metal or ferrosilicon alloys in electric arc furnaces, where quartz (silicon dioxide) is reduced with carbon at high temperatures.
As the silicon vaporizes and escapes from the furnace, it reacts with oxygen in the air to form very fine silica particles, which are then collected using baghouse filters.
Microsilica, Fused quartz, and silica glass are synonyms for glass made from high purity quartz.
Microsilica is manufactured by melting naturally occurring high purity quartz sand at approximately 2000 °C, using either an electrically heated furnace (electrically fused) or a gas/oxygen-fueled furnace (flame fused).
Microsilica is a kind of special glass composed of a single component of silica.
Microsilica can be divided into high-purity Microsilica, ordinary Microsilica and doped Microsilica, three categories.
According to transparency, Microsilica is divided into transparent and opaque, two categories; because of a series of excellent characteristics such as high purity, excellent performance for light penetration, high temperature resistance capability, thermal shock resistance, stable chemical property and resistance to radiation as well as electrical insulation, it is known as the "king of glass"; it can be made of tubes, rods, plates, blocks and fibers, can be processed into various shapes of equipment containers, can also be cut, polished, polished into prisms, lenses and other optical components.
Being mixed with a small amount of impurities can be made of new varieties of special properties such as ultra-low temperature expansion, fluorescent Microsilica, etc.; thus widely used in semiconductor, new light source, optical, instrumentation, thermal, metallurgical, chemical and building materials industry and laser technology, space technology, astronomy, nuclear engineering, optical communication and other high-tech fields.
A number of unique optical, mechanical and thermal properties have made Microsilica an indispensable material in the fabrication of high-tech products.
Microsilica is known largely as a synthetic material, but there are instances of the material occurring in nature.
Vitreous tubes called fulgurites are produced when lightning fuses quartz sand.
Large deposits of fulgurite exist in the Libyan desert.
Microsilica can also be produced by meteor impact.
The impact leads to rapid adiabatic heating of the quartz above its melting point.
The quartz forms a glass on cooling.
Examples of this type of vitreous silica have been found near Canyon Diablo, Arizona, and in meteorite craters in Australia and Arabia.
Modern manufacturing processes of vitreous typically involve the fusion or viscous sintering of silica particles; the particles can be derived from sand crystals or are produced through a chemical process, e.g., flame hydrolysis or sol–gel.
In one practice of the flame hydrolysis process, the powder is produced and fused into glass a single step, without the isolation of a porous body.
Dopant and additive profiles are concentration are then controlled by the deposition conditions.
When a process involving a discrete porous silica body as an intermediate is used, subsequent processing steps can be used to control dopant levels and in particular, the hydroxyl level of the final glass.
The choice of fabrication method is often dictated by the end-use specifications.
Flame hydrolysis or similar chemical techniques that allow for the production of very high purity glass are the methods of choice for optical applications but may be economically wasteful for less demanding applications.
Translucent vitreous silica is produced by fusion of high purity quartz sand crystals.
Sand is packed around a graphite rod through which a current is passed.
The resistance heating produces a plastic mass that can be blown into molds, drawn into tubing, or shaped by rolling or pressing.
Separation from the graphite rod is facilitated by gaseous products formed by interfacial reaction.
Because the outside is sandy, the product is known as sand-surface ware.
A matte finish is obtained by mechanical buffing.
A glazed surface is produced by fusing the outside surface with an electric carbon arc or flame.
Clear, transparent, bubble-free vitreous silica may be obtained by melting natural quartz minerals by flame or plasma vapor deposition (synthetic fused silicas), and by sol–gel processing.
Microsilica is used as a mineral, natural or synthetic fiber.
A potential danger to those involved in the production and handling of fumed silica for paint pigments or catalysts.
Diatomaceous earth is used in clarifying liquids, in manufacture of fire brick and heat insulators; used as a filtering agent; as a filler in construction materials; pesticides, paints, and varnishes.
A potential danger to those involved in mining of diatomaceous earth or fabrication of products there from.
Microsilica 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.
Uses Of Microsilica:
Microsilica is mainly used for semiconductor, electric light source, metallurgy and chemical industry and national defense science and technology.
Microsilica is mainly used for the chemical industry synthesis reactor, acid-resistant pipes, phosphor, optical glass melting pot, glass furnace refractories and other electrical and thermal materials.
Microsilica UV optical Microsilica is mainly used for precision optical instruments, analytical instruments, astronomic instruments and space technology.
Infrared optical Microsilica is mainly used for infrared detection and tracking system, apparatus of the precision optical instrument, the observation lens of the industrial furnace, missile radome, radar delay line and color TV delay line chip and so on.
Low-expansion Microsilica as a cavity material can improve the measurement accuracy of He-Ne laser and timing accuracy of atomic clock; as a kind of precision optical components, it is a high quality material for the lightweight astronomical telescope as well as a good material of the hagioscope for the spacecraft.
Fold-resistant Microsilica is used as materials for the anti-thermal shock optical window and structural material, especially used at high temperatures, which catalyze the crystallization of Microsilica with water vapor and oxygen.
Alkali-resistant Microsilica can be used for the production of metal halide lamp.
Microsilica has stable light color, high light maintenance rate so that life expectancy can be doubled and the life of the self-ballasted fluorescent high-pressure mercury lamp can be prolonged by more than three times, being a kind of ideal material for the manufacturing of the new light source system.
Microsilica is mainly applied to various kinds of high-intensity gas discharge lamps of third-generation electric light source such as anti-sodium lamp, sodium ingot holding lamps, iodine filing lamp and high-pressure mercury lamp.
Doped Microsilica can be used in fields of laser range finder, laser fusion and diamond laser drilling.
UV filter Microsilica: UV filter Microsilica is suitable for the manufacturing of high-pressure mercury lamp, germicidal lamp and neon lamp to be applied to medical, film and other daily electric lighting field, preventing the radiation of short-wave ultraviolet on the human body and the formation of ozone in the air.
Long wavelength ultraviolet light Microsilica, used as the platemaking light source of the colored photography, is conducive to the improvement of color chromaticity, used as the third generation of solid-state lasers and filter materials.
The laser efficiency can be increased by 20 to 50% and the lifespan of the light source can be extended to more than a thousand times.
Microsilica can be also eliminated of the damage of UV radiation on the human body and the corrosion of filter on the device and environmental pollution, allowing the laser miniaturization.
Microsilica brick is mainly used as the refractory materials for making melting low-alkali glass furnace.
Microsilica-ceramic used in metallurgy, chemical industry, glass, national defense and scientific research and other industries, especially for precision casting, infiltration nozzle of continuous casting steel and the fluid gate of the float glass melting furnace.
Fluorescence Microsilica is suitable for ultraviolet fluorescence instrument, high pressure liquid chromatography and other instruments.
Microsilica fiber: the laser medical fiber made of quartz fiber can transport the laser into the cavity of the human body to be combined with other drugs.
This can treat the cancers of the esophagus, trachea, rectum, stomach and other cavity as well as cancer of body surface such as breast and epidermis.
The optical fiber sensor made of quartz fiber can transmit temperature, pressure, displacement, speed, voltage, and current as well as solution concentration.
Compared with the traditional sensing technology, it is simple, anti-electromagnetic interference, fast and sensitive.
Microsilica is small and exquisite when made of ultraviolet radiation meter to be used for UV radiative detection in the medical, chemical, electronics and public security.
It has high sensitivity, good effect and low price.
Microsilica spring is used in thermobalance, gravimeter, seismograph and other precision instruments.
Microsilica is suitable for vacuum deposition.
Because of its extreme fineness and high silica content, silica fume is a very effective pozzolanic material.
Standard specifications for silica fume used in cementitious mixtures are ASTM C1240.
Microsilica is added to Portland 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 silica fume and free calcium hydroxide in the paste.
Addition of Microsilica 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.
Furthermore, Microsilica has important uses in oil and gas operations.
Microsilica can be used for a primary placement of grout as a hydraulic seal in the well bore, or secondary applications such as remedial operations including leak repairs, splits, and closing of depleted zones.
Microsilica is extensively used in the production of high-performance concrete due to its ability to improve the material’s compressive strength, durability, and resistance to chemical attack.
When added to concrete, microsilica fills in the microscopic voids between cement particles and reacts with calcium hydroxide to form more calcium silicate hydrate (C-S-H), which results in a denser, less permeable, and more robust concrete matrix.
This makes it ideal for use in high-rise buildings, bridges, skyscrapers, and other large-scale infrastructure projects that require long service life and resistance to aggressive environmental conditions.
In marine environments, structures are constantly exposed to chloride ions from seawater, which can lead to corrosion of steel reinforcement.
Microsilica is commonly used in marine construction, such as piers, harbors, offshore platforms, and underwater tunnels, because it significantly reduces the permeability of concrete and enhances its resistance to chloride ingress, thus protecting the embedded steel reinforcement from rust and structural damage.
Microsilica is also used in the construction of industrial flooring systems and highway pavements, especially where heavy mechanical loads or abrasive wear is expected.
Its inclusion in concrete helps produce a dense, abrasion-resistant surface that can withstand forklifts, machinery, and vehicular traffic over long periods without cracking or degrading.
In tunneling, mining, and slope stabilization projects, microsilica is frequently added to shotcrete—a type of concrete that is sprayed onto surfaces using compressed air.
Microsilica improves the cohesiveness and stickiness of shotcrete, reducing material rebound during spraying and improving adherence to irregular or vertical surfaces, which is critical for underground support structures and tunnel linings.
Many precast concrete elements, such as pipes, panels, tiles, and decorative architectural components, benefit from the inclusion of microsilica.
The improved strength, reduced curing time, and enhanced surface finish provided by microsilica contribute to faster production cycles and longer-lasting finished products, which is valuable in both residential and commercial construction sectors.
Because microsilica-enhanced concrete exhibits superior resistance to chemical attack, it is used in the construction of wastewater treatment plants, chemical processing facilities, and storage tanks for acids, salts, and other corrosive materials.
This application helps protect infrastructure from premature degradation due to chemical exposure.
Outside of concrete, microsilica is also used in the production of refractory castables and bricks, which are materials designed to withstand extremely high temperatures.
Its fine particles and high silica content allow for the formation of dense, strong ceramics that are thermally stable and chemically inert, making them suitable for lining furnaces, kilns, and ladles in the steel, glass, and metallurgy industries.
Microsilica is used in the formulation of blended cements, where it partially replaces Portland cement to reduce the overall clinker content.
This helps lower the environmental footprint of cement production, as less energy is consumed and fewer CO₂ emissions are generated.
The resulting cement still meets or exceeds performance requirements, especially in environmentally responsible building practices.
In electronic systems, such as radar and computers, signal delay is sometimes necessary.
A transducer converts electrical signals to ultrasonic elastic waves, which pass through a connecting medium to another transducer, where the waves are reconverted to electrical signals.
Space and Astronomy. Vitreous silica is used in several space-based applications because of static fatigue (slow crack growth), thermal stability, and radiation resistance.
Every U.S. space vehicle having service personnel, including Mercury, Gemini, Apollo, and space shuttle vehicles, has been equipped with windows made of high optical-quality vitreous silica (Corning Code 7940 or 7980) in order to have the clarity needed for visual, photographic, and television-based observations.
The space shuttle utilizes triple-layer windows that have outer and central panes of vitreous silica with a tempered aluminosilicate inner pane.
The outer pane is thinner for thermal endurance, whereas the two inner panes are thicker to supply strength.
Safety Profile Of Microsilica:
An inhalation hazard, questionable carcinogen with experimental tumorigenic data.
Poison by intraperitoneal, intravenous, and intratracheal routes.
The most significant hazard of microsilica is inhalation of airborne dust particles, which can easily become suspended in the air due to their ultrafine size (often less than 1 µm in diameter).
When inhaled, these particles can cause irritation to the nose, throat, and lungs, leading to coughing, sneezing, and difficulty breathing.
Prolonged or repeated exposure to respirable crystalline silica (if present in trace amounts in some batches of microsilica) can lead to a serious lung disease known as silicosis, a progressive and potentially fatal condition caused by scarring of lung tissue.
There is also evidence linking long-term silica dust exposure to lung cancer, especially among workers in poorly ventilated environments.
Microsilica dust can also cause mechanical irritation to the eyes, resulting in redness, watering, and discomfort.
If the dry powder comes into contact with the skin, it may cause dryness or mild irritation, although this is generally not severe unless prolonged or repeated skin exposure occurs.
In slurry or wet concrete mixes, microsilica may contribute to alkaline burns or dermatitis, especially when combined with the caustic nature of wet cement.
