1-9 A-D E-G H-M N-P Q-S T-Z




CAS NUMBER:16961-83-4
EC NUMBER:241-034-8


SYNONYMS:Hexafluorosilicic acid; Fluorosilicic acid; hekzafluorosilisc asit; HEKSAFLUOROSİLİSİK ASİT; HEXAFLOROSİLİSİK ASİT; hekzaflorosilisik asid; 16961-83-4; Dihydrogen hexafluorosilicate; Silicate(2-), hexafluoro-, dihydrogen; hexafluorosilicon(2-); hydron; dihydrogen hexafluorosilanediuide; MFCD00036289; silicofluoridd; Hexafluorosilic acid; hydrofluorosilic acid; Kieselfluorwasserstoffsaure; DTXSID2029741; MolPort-006-109-631; OHORFAFFMDIQRR-UHFFFAOYSA-P; dihydrogen(.) hexafluorosilanediuide; hexakis(fluoranyl)silicon(2-); hydron; RL02185; AK186263; AN-18676; IN001967; KB-52401; SC-47078; FT-0626488; A811126; Hexafluorosilicic acid, 23% w/w aqueous solution; J-521443; Hexafluorosilicic acid solution, 23 wt. % in water 100g; fluorosilicic acid; hexafluorosilicic acid; hydrofluorosilicic acid; silicon hexafluoride dihydride; Hexafluorosilicic acid; 01302; Fluosilicic acid; Hexafluorosilicic acid; ACTH;ACTH 1-39;Sand acid ;CORTICOTROPHIN;CORTICOTROPIN A;FLUOSILICIC ACID;FLUOROSILIC ACID;Fluorsilicic acid;SILICOFLUORIC ACID;FLUOROSILICIC ACID; Hexafluorosilicic Acid; MFCD00036289; 69109 Hexafluorosilicic acid, 23% w/w aq. soln.; L14829 Hexafluorosilicic acid, 35% w/w aq. soln.; HEXAFLUOROSILICICACID; FLUOROSILICIC ACID; Alfa AesarTM Hexafluorosilicic acid, 35% w/w aq. soln.; hexafluorosilicic acid; Fluorosilicic Acid; Fluorosilicic acid (FSA); Hexafluorosilicic acid (HFA or HFS); Sand acid; Silicate(2-), hexafluoro- hydrogen (1:2); Silicofluoride; Fluosilicic acid; Hydroflurosilicic acid; Silicofluoric acid; Silicon hexafluoride dihydride; Silicate(2-), hexafluoro-, dihydrogen; Hexafluorosilicic acid 35% (w/w) in aqueous solution; Hexafluorosilicic acid (23% aqueous solution); Hexafluorosilicic acid; Hexafluorosilicic Acid; HEXAFLUOROSILICIC ACID 34%; Hexafluorosilicic acid; Electronic Grade Hexafluorosilicic Acid Solution; Hexafluorosilicic; HEKSAFLOROSİLİK ASİT; HEKSAFLOROSLİSİK ASİT; HEKSAFLOROSİLİSİK ASİT; HEXA FLORO SİLİSİK ASİT; heksa salisilik asit; heksa; hexa; hepta; heptaflorosilisik asit; heksaflorosilisik asit; heksa; floro; flor; silisik; slisik; silisilik asit; heksa floro silisik asit; heksa floro silisik acid; ion chromatography (IC); ultraviolet (UV) detector; conductivity detector; hexafluorosilicic acid; heksaflorosılısık asıd; heksa floro sılısık asıt; heksa floro salısık acıde; heksa floro salısık asid; HEKSA FLORO SALISIK ASIT; FH2O2Si; fluorosilicic acid; hexafluorosilicic acid; hydrofluorosilicic acid; silicon hexafluoride dihydride; Hexafluorosilicic acid; Fluorosilicic acid;16961-83-4; Dihydrogen hexafluorosilicate;Silicate(2-), hexafluoro-, dihydrogen;hexafluorosilicon(2-); hydron;dihydrogen hexafluorosilanediuide;MFCD00036289;silicofluoridd;Hexafluorosilic acid;hydrofluorosilic acid;DTXSID2029741;MolPort-006-109-631; OHORFAFFMDIQRR-UHFFFAOYSA-P; dihydrogen(.) hexafluorosilanediuide;hexakis(fluoranyl)silicon(2-); hydron;RL02185; AK186263; AN-18676; IN001967; KB-52401; SC-47078; FT-0626488; A811126; Hexafluorosilicic acid, 23% w/w aqueous solution; J-521443;Hexafluorosilicic acid solution, 23 wt. % in water 100g;DIHYDROGEN HEXAFLUOROSILICATE; DIHYDROGEN HEXAFLUOROSILICATE(2-); FLUOROSILIC ACID; FLUOROSILICIC ACID; FLUOROSILICIC ACID (H2SIF6);FLUOSILICIC ACID;HEXAFLUOROSILICIC ACID; HEXAFLUOSILICIC ACID; HYDROFLUOROSILICIC ACID; HYDROFLUOSILIC ACID; HYDROFLUOSILICIC ACID; HYDROGEN HEXAFLUOROSILICATE; HYDROGEN HEXAFLUOROSILICATE (H2SIF6); SAND ACID; SILICOFLUORIC ACID; SILICON HEXAFLUORIDE DIHYDRIDE; Acide fluorosilicique [French]; Acido fluosilicico [Italian]; Dihydrogen hexafluorosilicate [ACD/IUPAC Name]; Dihydrogenhexafluorosilicat [German] [ACD/IUPAC Name];Hexafluorosilicate de dihydrogène [French] [ACD/IUPAC Name];Hexafluorosilicic acid [Wiki];Silicate(2-), hexafluoro-, dihydrogen [ACD/Index Name]; Acide fluosilicique [French]; Caswell No. 463; CCRIS 2296; DIHYDROGEN HEXAFLUOROSILANEDIUIDE; Dihydrogen hexafluorosilicate (2-); Dihydrogen hexafluorosilicate(2-); Fluorosilicic acid; Fluorosilicic acid [UN1778] [Corrosive]; Fluosilicic acid; Hexafluorokieselsaeure [German]; Hexafluorokiezelzuur [Dutch]; Hexafluorosilic acid; Hexafluorosilicic acidaqueous; hexafluorosilicon(2-); hydron; Hexafluosilicic acid; HSDB 2018; Hydrofluorosilicic acid; Hydrofluosilicic acid; Hydrogen hexafluorosilicate; Hydrosilicofluoric acid; Kiezelfluorwaterstofzuur [Dutch]; MFCD00036289 [MDL number]; NSC 16894;Sand acid; SILICOFLUORIC ACID; Silicofluoride; Silicon hexafluoride dihydride; UN1778;??? [Chinese]; ACTH; ACTH 1-39; Sand acid; CORTICOTROPHIN; CORTICOTROPIN A;FLUOSILICIC ACID;FLUOROSILIC ACID;Fluorsilicic acid;SILICOFLUORIC ACID;FLUOROSILICIC ACID;FSA ; H2SIF6 ; HEXAFLUOROSILICIC ACID ; HYDROFLUOROSILICIC ACID ; HYDROSILICOFLUORIC ACID; Fluorosilicic acid; Hydrogen hexafluorosilicate; Fluorosilicic acid solution; Dihydrogen hexafluorosilicate; Silicate(2-), hexafluoro-, dihydrogen; silicofluoridd; Silicofluoric acid; hydrofluorosilic acid; Tetrafluorosilane dihydrofluorideCorticotropin; Dihydrogen hexafluorosilicate; FKS ; Fluosilicic acid (6CI); Fluorosilicic acid; Hexafluorosilicic acid; Hexafluorosilicate (2 - ), dihydrogen; Hexafluosilicic acid; Hydrofluorosilicic acid; Hydrofluosilicic acid; Hydrogen hexafluorosilicate; Hydrogen hexafluorosilicic; Hydrosilicofluoric acid; Sand acid; Silicate (2-), hexafluoro-, dihydrogen (8CI, 9CI); Silicic acid (H2SiF6) ;Silicofluoric acid; Silicofluoride Silicon hexafluoride dihydride; UN1778 (DOT);Silicate(2-), Hexafluoro-, Dihydrogen; Fluorosilicic Acid; Hexafluorosilicic acid; ACTH; ACTH 1-39; ACTH (1-39), HUMAN; ADRENOCORTICOTROPIC HORMONE (1-39) (HUMAN); ADRENOCORTICOTROPIC HORMONE HUMAN; CORTICOTROPHIN; CORTICOTROPIN; CORTICOTROPIN A; CORTICOTROPIN (HUMAN); DIHYDROGEN HEXAFLUOROSILICATE; FLUOROSILIC ACID; FLUOROSILICIC ACID; FLUOSILICIC ACID;HEXAFLUOROSILICIC ACID;HEXAFLUOSILICIC ACID;H-SER-TYR-SER-MET-GLU-HIS-PHE-ARG-TRP-GLY-LYS-PRO-VAL-GLY-LYS-LYS-ARG-ARG-PRO-VAL-LYS-VAL-TYR-PRO-ASN-GLY-ALA-GLU-ASP-GLU-SER-ALA-GLU-ALA-PHE-PRO-LEU-GLU-PHE-OH;HYDROFLUOROSILICIC ACID;HYDROFLUOSILICIC ACID;HYDROGEN HEXAFLUOROSILICATE;HYDROSILICOFLUORIC ACID;16961-83-4; silicate(2-), hexafluoro-; hexafluorosilicate; tetrafluorosilane dihydrofluoride; Hydrofluosilicic acid; Hexafluorosilicic Acid; Fluorosilicic acid; Sand acid; CORTICOTROPHIN; CORTICOTROPIN A; FLUOROSILIC ACID; 16961-83-4; Dihydrogenhexafluorosilicate; hexafluorosilicon(2-); hydron; dihydrogenhexafluorosilanediuide; Silicate(2-),hexafluoro-,dihydrogen;SILICOFLUORIC; ACID; SYSMEHFRWGKPVGKKRRPVKVYPNGAEDESAEAFPLEF; SER-TYR-SER-MET-GLU-HIS-PHE-ARG-TRP-GLY-LYS-PRO-VAL-GLY-LYS-LYS-ARG-ARG-PRO-VAL-LYS-VAL-TYR-PRO-ASN-GLY-ALA-GLU-ASP-GLU-SER-ALA-GLU-ALA-PHE-PRO-LEU-GLU-PHE;SER-TYR-SER-MET-GLU-HIS-PHE-ARG-TRP-GLY-; HEKZA FLOROSILIS ACID; HEKZAFLOROSILICACID; HEKSA FLORASILIS ACID; HEKSA FLOROSILIS ASIT; heksaflorosilisasit; hekzaflorosilisacid; HEKZAFLOROSİLİSİLİC ASİT; hekzafulorosilicicacide; hekzafloroslyslicicaicde; hexaflorosilicicasit; hexaflorosilisikasit


Hexafluorosilicic acid is an inorganic compound with the chemical formula (H3O)2SiF6 (also written as (H3O)2[SiF6]). It is a colorless liquid rarely encountered undiluted. Hexafluorosilicic acid has a distinctive sour taste and pungent smell. It is produced naturally on a large scale in volcanoes.[1][2] It is manufactured as a coproduct in the production of phosphate fertilizers. The resulting hexafluorosilicic acid is almost exclusively consumed as a precursor to aluminum trifluoride and synthetic cryolite, which are used in aluminium processing. Salts derived from hexafluorosilicic acid are called hexafluorosilicates.
Hexafluorosilicic acid is generally assumed to consist of oxonium ions charge balanced by hexafluorosilicate dianions as well as water. In aqueous solution, the hydronium cation (H3O+) is traditionally equated with a solvated proton, and as such, the formula for this compound is often written as H2SiF6. Extending that metaphor, the isolated compound is then written as H2SiF6·2H2O, or (H3O)2SiF6.The situation is similar to that for chloroplatinic acid, fluoroboric acid, and hexafluorophosphoric acid. Hexafluorosilicate is an octahedral anion; the Si-F bond distances are 1.71 Å.[3] Hexafluorosilicic acid is only available commercially as solution.[4]
Production and principal reactions
The commodity chemical hydrogen fluoride is produced from fluorspar by treatment with sulfuric acid.[5] As a by-product, approximately 50 kg of (H3O)2SiF6 is produced per tonne of HF owing to reactions involving silica-containing mineral impurities. (H3O)2SiF6 is also produced as a by-product from the production of phosphoric acid from apatite and fluorapatite. Again, some of the HF in turn reacts with silicate minerals, which are an unavoidable constituent of the mineral feedstock, to give silicon tetrafluoride. Thus formed, the silicon tetrafluoride reacts further with HF. The net process can be described as:[6]
SiO2 + 6 HF → SiF2-6 + 2 H3O+
Hexafluorosilicic acid can also be produced by treating silicon tetrafluoride with hydrofluoric acid.
In water, hexafluorosilicic acid readily hydrolyzes to hydrofluoric acid and various forms of amorphous and hydrated silica (SiO2"). At the concentration usually used for water fluoridation, 99% hydrolysis occurs and the pH drops. The rate of hydrolysis increases with pH. At the pH of drinking water, the degree of hydrolysis is essentially 100%.[7]
H2SiF6 + 2 H2O → 6 HF + "SiO2"
Neutralization of solutions of hexafluorosilicic acid with alkali metal bases produces the corresponding alkali metal fluorosilicate salts:
(H3O)2SiF6 + 2 NaOH → Na2SiF6 + 4 H2O
The resulting salt Na2SiF6 is mainly used in water fluoridation. Related ammonium and barium salts are produced similarly for other applications.
Near neutral pH, hexafluorosilicate salts hydrolyze rapidly according to this equation:[8]
6 + 2 H2O → 6 F- + SiO2 + 4 H+
The majority of the hexafluorosilicic acid is converted to aluminium fluoride and cryolite.[6] These materials are central to the conversion of aluminium ore into aluminium metal. The conversion to aluminium trifluoride is described as:
H2SiF6 + Al2O3 → 2 AlF3 + SiO2 + H2O
Hexafluorosilicic acid is also converted to a variety of useful hexafluorosilicate salts. The potassium salt is used in the production of porcelains, the magnesium salt for hardened concretes and as an insecticide, and the barium salts for phosphors.
Hexafluorosilicic acid is also used as an electrolyte in the Betts electrolytic process for refining lead.
Hexafluorosilicic acid (identified as hydrofluorosilicic acid on the label) along with oxalic acid are the active ingredients used in Iron Out rust-removing cleaning products, which are essentially varieties of laundry sour.
Niche applications
H2SiF6 is a specialized reagent in organic synthesis for cleaving Si-O bonds of silyl ethers. It is more reactive for this purpose than HF. It reacts faster with t-butyldimethysilyl (TBDMS) ethers than triisopropylsilyl (TIPS) ethers.[9]
Hexafluorosilicic acid and the salts are used as wood preservation agents.[10]
Hexafluorosilicic acid can release hydrogen fluoride when evaporated, so it has similar risks. Inhalation of the vapors may cause lung edema. Like hydrogen fluoride, it attacks glass and stoneware.[11] The LD50 value of hexafluorosilicic acid is 430 mg/kg.[12]



Molecular Weight 144.091 g/mol 
Hydrogen Bond Donor Count 2 
Hydrogen Bond Acceptor Count 7
Physical Description
Fluorosilicic acid appears as a colorless fuming liquid with a penetrating pungent odor. Corrosive to metals and tissue. Both the fumes and very short contact with the liquid can cause severe and painful burns. Used in water fluoridation, in hardening cement and ceramics, as a wood preservative.
Boiling Point of Hexafluorosilicic Acid : 212 °F at 760 mm Hg (water) approx.
Melting Point of Hexafluorosilicic Acid : -4 °F
Density of Hexafluorosilicic Acid : 1.3 at 77 °F (approx.)
Antiadhesive Used to prevent adhesion 
Antisetoff Spray powder used to make air gap between printed sheets of paper 
Building_material Materials used in the building process, such as flooring, insulation, caulk, tile, wood, glass, etc. 
Casting_agent Casting agents or molding compounds for plastics, sand, or metals 
Child_use Related to products specifically designed for children (e.g. toys, children's cosmetics, etc)
Fertilizer Fertilizer for consumer or industrial use, and manufacturing of fertilizers 
Fluid_property_modulator Includes antifoaming agents, coagulating agents, dispersion agents, emulsifiers, flotation agents, foaming agents, viscosity adjustors, etc 
Food_contact Includes food packaging, paper plates, cutlery, small appliances such as roasters, etc.; does not include facilities that manufacture food 
Manufacturing, automotive Generally related to automobiles or their manufacture, used when automotive_care or automotive_component are not applicable (e.g. auto fuel, GPS units), or detailed information is not known
Industry Uses of Hexafluorosilicic Acid 
- Agricultural chemicals (non-pesticidal)
- Corrosion inhibitors and anti-scaling agents
- Flame retardants
- Fluorinating agent
- Oxidizing/reducing agents
- Plating agents and surface treating agents
- Processing aids, not otherwise listed
- Surface active agents
- Water Fluoridation
- Water Treatment Processing and other miscellaneous uses
General Manufacturing Information 
Industry Processing Sectors about Hexafluorosilicic Acid 
- Computer and electronic product manufacturing
- Construction
- Nonmetallic mineral product manufacturing (includes clay, glass, cement, concrete, lime, gypsum, and other nonmetallic mineral product manufacturing.
- Pesticide, fertilizer, and other agricultural chemical manufacturingServices
- Soap, cleaning compound, and toilet preparation manufacturing
- Utilities
- Wholesale and retail trade
Health Hazard of Hexafluorosilicic Acid
Inhalation of vapor produces severe corrosive effect on mucous membrane. Ingestion causes severe burns of mouth and stomach. Contact with liquid or vapor causes severe burns of eyes and skin. 
Fire Hazard of Hexafluorosilicic Acid
Special Hazards of Combustion Products: Irritating fumes of hydrogen fluoride may form in fire.



General description hexafluoro silicic acid
High-silic fluoro silicic acids have been prepared. They have desired amount of extra silica upto 18% more than the composition as represented by H2SiF6.[3] Preparation and properties of fluosilicic acid have been reported.[4] Fluosilicic acid can be obtained as a major byproduct of phosphate fertilizer industry.[7]It can be used in the preparation of sodium fluorosilicate, via neutralization with sodium chloride.[6] It can also undergo neutralization with ammonia to produce ammonium fluoride and silica.[7]
Appearance Light yellow liquid
Fluosilicic acid (FSA, H2SiF6) has been used in the following studies:
• Fluoridation of fluoridated municipal water supplies.
• Surface modification of calcium carbonate.
• Liquid phase deposition (LPD) of silica.
About Hexafluorosilicic Acid
Hexafluorosilicic Acid is a water insoluble Silicon source for use in oxygen-sensitive applications, such as metal production. In extremely low concentrations (ppm), fluoride compounds are used in health applications. Fluoride compounds also have significant uses in synthetic organic chemistry. They are commonly also used to alloy metal and for optical deposition. Certain fluoride compounds can be produced at nanoscale and in ultra high purity forms. Hexafluorosilicic Acid is generally immediately available in most volumes. Ultra high purity and high purity compositions improve both optical quality and usefulness as scientific standards. Nanoscale elemental powders and suspensions, as alternative high surface area forms, may be considered. American Elements produces to many standard grades when applicable, including Mil Spec (military grade); ACS, Reagent and Technical Grade; Food, Agricultural and Pharmaceutical Grade; Optical Grade, USP and EP/BP (European Pharmacopoeia/British Pharmacopoeia) and follows applicable ASTM testing standards. Typical and custom packaging is available. Additional technical, research and safety (MSDS) information is available as is a Reference Calculator for converting relevant units of measurement.
Hexafluorosilicic acid Chemical Properties,Uses,Production
Hexafluorosilicic acid is a kind of inorganic acid. It is majorly used for the fluoridation of water in United State to minimize the incidence of dental caries and dental fluorosis. For chemical synthesis, it is majorly used for the manufacturing of aluminum fluoride and cryolite as well as many kinds of hexafluorosilicate salts. It can also be used for the production of silicon and silicon dioxide. It can also be used as an electrolyte in the Betts electrolytic process for refining lead. It is also a specialized reagent in organic synthesis for cleaving Si-O bonds of silyl ethers.
Chemical Properties
Fluosilicic acid,H2SiF6, also known as hydrofluorosilicic acid,is a colorless liquid that is soluble in water. It is highly corrosive and toxic,attacking glass and stoneware. Fluosilicic acid is used in water fluoridation, electroplating, and in manufacturing enamels and cement.
Chemical Properties
Fluorosilicic acid is a transparent, colorless fuming liquid.
Uses Hexafluorosilicic acid
A 1-2% solution is used widely for sterilizing equipment in brewing and bottling establishments. Other concentrations are used in the electrolytic refining of lead, in electroplating, for hardening cement, crumbling lime or brick work, for the removal of lime from hides during the tanning process, to remove molds, as preservative for timber.
General Description Hexafluorosilicic acid
A colorless fuming liquid with a penetrating pungent odor. Corrosive to metals and tissue. Both the fumes and very short contact with the liquid can cause severe and painful burns. Used in water fluoridation, in hardening cement and ceramics, as a wood preservative.
Air & Water Reactions
Fumes in air. Soluble in water with release of heat and corrosive fumes.
Reactivity Profile Hexafluorosilicic acid
Hexafluorosilicic acid can react with strong acids (such as sulfuric acid) to release fumes of toxic hydrogen fluoride. Attacks glass and materials containing silica. Reacts exothermically with chemical bases (examples: amines, amides, inorganic hydroxides). Reacts with active metals, including iron and aluminum to dissolve the metal and liberate hydrogen and/or toxic gases. Can initiate polymerization in certain alkenes. Reacts with cyanide salts and compounds to release gaseous hydrogen cyanide. Flammable and/or toxic gases are also often generated by reactions with dithiocarbamates, isocyanates, mercaptans, nitrides, nitriles, sulfides, and weak or strong reducing agents. Additional gas-generating reactions may occur with sulfites, nitrites, thiosulfates (to give H2S and SO3), dithionites (SO2), and carbonates. Can catalyze (increase the rate of) chemical reactions. Decomposes when heated to the boiling point to produce very toxic and corrosive hydrogen fluoride gas.
Hazard Hexafluorosilicic acid
Extremely corrosive by skin contact and inhalation.
Health Hazard
Inhalation of vapor produces severe corrosive effect on mucous membrane. Ingestion causes severe burns of mouth and stomach. Contact with liquid or vapor causes severe burns of eyes and skin.
Fire Hazard
Special Hazards of Combustion Products: Irritating fumes of hydrogen fluoride may form in fire.
Industrial uses of Hexafluorosilicic acid
Hydrofluorosilicic acid (H2SiF6) is a colorless to light brown liquid. It is also manufactured from calcium fluoride or other fluoride-containing products. Hydrofluorosilic acid is a strong depressant for many silicates during flotation of a number of oxidic minerals. It is used for gangue depression during flotation of tin, columbite and tantalite.
Safety Profile of Hexafluorosilicic acid
Poison by subcutaneous route. A corrosive irritant to sktn, eyes, and mucous membranes. Will react with water or steam to produce toxic and corrosive fumes. When heated to decomposition it emits toxic fumes of F-. See also FLUORIDES.
Potential Exposure of Hexafluorosilicic acid
A solution of fluorosilicic acid is used for sterilization in the brewing and bottling industry, elec trolytic refining of lead; electroplating, hardening cement; removing mold, and others.
Shipping of Hexafluorosilicic acid
UN1778 Fluorosilicic acid, Hazard class: 8; Labels: 8-Corrosive material.
The aqueous solution is a strong acid. Reacts with water or steam to produce toxic and corrosive fumes of hydrogen fluoride. Incompatible, and may react violently with: bases, aliphatic amines; alkanolamines, alkylene oxides; aromatic amines; amides, ammonia, ammonium hydroxide; calcium oxide; epichlorohydrin, iso cyanates, oleum, organic anhydrides; sulfuric acid; strong oxidizers; vinyl acetate; water. Attacks glass, concrete, and ceramics. The anhydrous form dissociates almost instantly into silicon tetrafluoride and hydrogen fluoride.
Waste Disposal
Add slowly to a large amount of soda ash in solution. Discharge to sewer with large volumes of water



Heksaflüorosilik asit, kimyasal formülü (H30) 2SiF6 (ayrıca (H30) 2 [SiF6] olarak da yazılır) ile inorganik bir bileşiktir. Seyreltilmeden nadiren karşılaşılan renksiz bir sıvıdır. Heksafluorosilik asit, belirgin bir ekşi tada ve keskin bir kokuya sahiptir. Volkanlarda doğal olarak büyük ölçekte üretilir. [1] [2] Fosfat gübrelerinin üretiminde bir kopotif olarak üretilmektedir. Elde edilen heksaflüorosilik asit, alüminyum işlemede kullanılan alüminyum triflorür ve sentetik kriyolitin öncüsü olarak neredeyse tamamen tüketilir. Heksaflüorosilik asitten türetilen tuzlara heksaflüorosilikatlar denir.
Heksaflüorosilik asitin genellikle heksaflorosilikat dianyonları ile dengelenmiş oksonyum iyonlarının yanı sıra sudan oluştuğu varsayılır. Sulu çözeltide, hidronyum katyonu (H30 +) geleneksel olarak solvatlanmış bir protonla eşitlenir ve bu nedenle bu bileşik için formül genellikle H2SiF6 olarak yazılır. Bu metaforu uzatan, izole edilmiş bileşik daha sonra H2SiF6 · 2H2O veya (H3O) 2SiF6 olarak yazılır. Heksaflorosilikat bir oktahedral anyon; Si - F bağ mesafeleri 1,71 Å'dir.Heksaflüorosilik asit, sadece ticari olarak çözelti halinde bulunur. 
Heksaflüorosilik asit kullanımı
Bira ve şişeleme tesislerinde sterilizasyon ekipmanı için% 1-2'lik bir çözelti yaygın olarak kullanılmaktadır. Kurşunun elektrolitik rafine edilmesinde, elektrokaplamada, çimentoyu sertleştirmek, kireç veya tuğla işlerini kırmak, bronzlaşma işlemi sırasında kirecin deriden çıkarılması, kalıpların çıkarılması için kereste koruyucu olarak kullanılır.
Heksaflüorosilik Asitin Endüstriyel Kullanımları
- Tarım kimyasalları (böcek öldürücü olmayan)
- Korozyon önleyiciler ve kireç önleyici maddeler
- Alev geciktiriciler
- Florlama maddesi
- Oksitleyici / indirgeyici ajanlar
- Kaplama maddeleri ve yüzey işleme maddeleri
- Aksi listelenmemiş işleme yardımcıları
- Yüzey aktif maddeler
- Su Florürleme
- Su Arıtma İşleme ve diğer çeşitli kullanımlar


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