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Ammonium hexafluorosilicate is a versatile inorganic salt used in glass treatment, metal processing, and specialty chemical formulations.
Ammonium hexafluorosilicate's good water solubility allows efficient incorporation into a wide range of aqueous industrial systems.
Ammonium hexafluorosilicate provides a practical source of fluoride and silicon for controlled technical and manufacturing applications.
CAS Number: 16919-19-0
EC Number: 240-968-3
Molecular Formula: (NH4)2SiF6
Molecular Mass: 178.15 g/mol
Synonyms: Ammonium hexafluorosilicate, Ammonium Hexafluorosilicate, Diammonium Hexafluorosilicate, Ammonium Silicofluoride, Ammonium Fluosilicate, DiAmmonium hexafluorosilicate, Ammonium Silicon Fluoride, Silicic Acid, Hexafluoro-, Diammonium Salt
Ammonium hexafluorosilicate has the formula (NH4)2SiF6.
Ammonium hexafluorosilicate, like all salts of fluorosilicic acid.
Ammonium hexafluorosilicate is made of white crystals which have at least three polymorphs and appears in nature as rare minerals cryptohalite or bararite.
Ammonium hexafluorosilicate finds use as a catalyst additive in low grade fuel refining, as a disinfectant, and it is useful in etching glass, metal casting, and electroplating.
Ammonium hexafluorosilicate is also used to help neutralize washing machine water as a laundry sour.
Ammonium hexafluorosilicate is an inorganic fluorosilicate compound with the chemical formula (NH4)2SiF6, typically supplied as a white crystalline solid.
Ammonium hexafluorosilicate is soluble in water and serves as a practical source of fluoride and silicon-containing ions in a variety of industrial and chemical processes.
Ammonium hexafluorosilicate is commonly used in glass and metal surface treatment, specialty cleaning formulations, textile processing, chemical synthesis, and the preparation of fluorosilicate-containing materials.
Ammonium hexafluorosilicate may also be employed in surface modification and technical formulations where controlled fluoride activity is required.
Ammonium hexafluorosilicate's defined composition, good water solubility, and compatibility with aqueous processing systems make Ammonium hexafluorosilicate a versatile material for industrial, laboratory, and specialty chemical applications.
Ammonium hexafluorosilicate is a high-purity chemical widely used in water treatment and the glass industry.
Ammonium hexafluorosilicate's CAS number is 16919-19-0.
Ammonium hexafluorosilicate is also effective in the production of fluorescent lamps and in pesticide formulations.
Ammonium hexafluorosilicate is available in industrial grade from reliable suppliers.
Ammonium hexafluorosilicate is manufactured according to strict quality control standards and provides consistent performance in various applications.
Uses of Ammonium Hexafluorosilicate:
Ammonium hexafluorosilicate finds use as a disinfectant, and it is useful in etching glass, metal casting, and electroplating.
Ammonium hexafluorosilicate is also used to help neutralize washing machine water as laundry sour.
Ammonium hexafluorosilicate is used in glass etching, frosting, and surface treatment applications.
Ammonium hexafluorosilicate is also employed in metal surface processing, specialty cleaning formulations, textile treatment, and chemical synthesis.
Ammonium hexafluorosilicate serves as a source of fluoride and silicon in various industrial processes and can be used in the preparation of other fluorosilicate-containing materials.
Structure of Ammonium Hexafluorosilicate:
Ammonium hexafluorosilicate has three major polymorphs: α-(NH4)2[SiF6] form is cubic (space group Fm3m, No. 225) and corresponds to the mineral cryptohalite.
The β form is trigonal (scalenohedral) and occurs in nature as mineral bararite.
A third (γ) form was discovered in 2001 and identified with the hexagonal 6mm symmetry.
In all three configurations, the [SiF6]2− octahedra are arranged in layers.
In the α form, these layers are perpendicular to directions.
In the β- and γ- forms, the layers are perpendicular to the c-axis. (Note: trigonal symmetry is part of the hexagonal group, but not all hexagonal crystals are trigonal.
The silicon atoms of α-(NH4)2[SiF6] (alpha), have cubic close packing (CCP).
The γ form has hexagonal close packing and the β-(NH4)2[SiF6] has primitive hexagonal packing.
In all three phases, 12 fluorine atoms neighbor the (NH4)+.
Although bararite was claimed to be metastable at room temperature, Ammonium hexafluorosilicate does not appear one polymorph has ever turned into another.
Still, bararite is fragile enough that grinding it for spectroscopy will produce a little cryptohalite.
Even so, Ammonium hexafluorosilicate assumes a trigonal form at pressures of 0.2 to 0.3 GPa.
The reaction is irreversible.
If it is not bararite, the phase is at least very closely related.
The hydrogen bonding in (NH4)2[SiF6] allows this salt to change phases in ways that normal salts cannot.
Interactions between cations and anions are especially important in how ammonium salts change phase.
Chemical Properties of Ammonium Hexafluorosilicate:
Ammonium hexafluorosilicate is noncombustible, but it will still release dangerous fumes in a fire, including hydrogen fluoride, silicon tetrafluoride, and nitrogen oxides.
Ammonium hexafluorosilicate will corrode aluminium.
In water, Ammonium hexafluorosilicate dissolves to form an acid solution.
Natural Occurrence of Ammonium Hexafluorosilicate:
This chemical makes rare appearances in nature.
Ammonium hexafluorosilicate is found as a sublimation product of fumaroles and coal fires.
As a mineral, Ammonium hexafluorosilicate is either called cryptohalite or bararite, the two being two polymorphs of the compound.
Stability and Reactivity of Ammonium Hexafluorosilicate:
Chemical Stability:
Ammonium hexafluorosilicate is stable under normal recommended storage and handling conditions.
Reactivity:
The substance may react with strong acids, bases, and other incompatible materials.
Conditions to Avoid:
Avoid excessive heat, moisture, and contact with incompatible substances.
Incompatible Materials:
Strong acids, strong bases, and strong oxidizing agents should be avoided.
Hazardous Decomposition Products:
Heating may produce ammonia, hydrogen fluoride, silicon tetrafluoride, and other fluorine-containing fumes.
Handling and Storage of Ammonium Hexafluorosilicate:
Safe Handling:
Handle in a well-ventilated area and minimize dust generation.
Hygiene Measures:
Wash hands and exposed skin thoroughly after handling.
Storage Conditions:
Store in a cool, dry, and well-ventilated place with the container tightly closed.
Container Requirements:
Use suitable tightly sealed containers and protect the material from moisture.
First Aid Measures of Ammonium Hexafluorosilicate:
Inhalation:
Move the affected person to fresh air and obtain medical attention if symptoms occur.
Skin Contact:
Wash the affected area thoroughly with plenty of water and remove contaminated clothing.
Eye Contact:
Rinse cautiously with plenty of water for several minutes and obtain medical attention if irritation persists.
Ingestion:
Rinse the mouth with water and seek medical attention.
Firefighting Measures of Ammonium Hexafluorosilicate:
Suitable Extinguishing Media:
Use extinguishing media appropriate for the surrounding fire.
Specific Fire Hazards:
Heating may generate irritating or toxic fluorine-containing decomposition products.
Protective Equipment:
Firefighters should wear suitable protective clothing and self-contained breathing apparatus when necessary.
Firefighting Procedures:
Cool exposed containers with water spray and prevent contaminated firefighting water from entering drains.
Accidental Release Measures of Ammonium Hexafluorosilicate:
Personal Precautions:
Avoid breathing dust and ensure adequate ventilation during cleanup.
Protective Equipment:
Wear suitable gloves, protective clothing, and eye protection.
Environmental Precautions:
Prevent large quantities from entering drains, waterways, or soil.
Cleanup Methods:
Carefully collect spilled material without generating excessive dust and place it in a suitable closed container for disposal.
Exposure Controls/Personal Protection of Ammonium Hexafluorosilicate:
Engineering Controls:
Provide adequate general ventilation and local exhaust where dust may be generated.
Eye Protection:
Wear safety glasses or chemical protective goggles.
Hand Protection:
Use suitable chemical-resistant protective gloves.
Skin Protection:
Wear appropriate protective clothing.
Respiratory Protection:
Use suitable particulate respiratory protection where ventilation is insufficient or airborne dust may be present.
Identifiers of Ammonium Hexafluorosilicate:
Chemical Name: Ammonium hexafluorosilicate
IUPAC Name: Diammonium Hexafluorosilicate
CAS Number: 16919-19-0
EC Number: 240-968-3
Molecular Formula: (NH4)2SiF6
Molecular Mass: 178.15 g/mol
PubChem CID: 28127
UN Number: 2854
Chemical Type: Inorganic fluorosilicate salt
Name: diazanium;hexafluorosilicon(2-)
CAS Number: 16919-19-0
EINECS: 240-968-3
FDA UNII: 1X545W620G
MDL: MFCD00010887
Molecular Weight: 178.15347920
Formula: F6 H8 N2 Si
CAS Number: 16919-19-0
ChemSpider: 26182
ECHA InfoCard: 100.037.229
EC Number: 240-968-3
PubChem CID: 28145
RTECS number: VV7800000
UNII: 1X545W620G
UN number: 2854
CompTox Dashboard (EPA): DTXSID6047076
InChI: InChI=1S/F6Si.2H3N/c1-7(2,3,4,5)6;;/h;2*1H3/q-2;;/p+2
Key: ITHIMUMYFVCXSL-UHFFFAOYSA-P
InChI=1/F6Si.2H3N/c1-7(2,3,4,5)6;;/h;2*1H3/q-2;;/p+2
Key: ITHIMUMYFVCXSL-SKRXCDHZAK
SMILES: F[Si-2](F)(F)(F)(F)F.[NH4+].[NH4+], [NH4+].[NH4+].F[Si--](F)(F)(F)(F)F
Properties of Ammonium Hexafluorosilicate:
Physical State: Solid
Appearance: White crystalline solid
Odor: Odorless
Molecular Formula: (NH4)2SiF6
Molecular Mass: 178.15 g/mol
Density: Approximately 2.0 g/cm³
Melting Point: Decomposes on heating
Solubility in Water: Soluble
Chemical formula: (NH4)2[SiF6]
Appearance: White crystals
Density: 2.0 g cm−3
Melting point: 100 °C (212 °F; 373 K) (decomposes)
Solubility: dissolves in water and alcohol
Appearance: white crystalline solid (est)
Assay: 95.00 to 100.00
Food Chemicals Codex Listed: No
Specific Gravity: 2.01100 @ 25.00 °C.
Flash Point: 32.00 °F. TCC ( 0.00 °C. ) (est)
Specifications of Ammonium Hexafluorosilicate:
Molecular weight: 178.15
EINECS: 240-968-3
SMILES: [NH4+].[NH4+].F[Si--](F)(F)(F)(F)F
Melting Point: °Cd ec.)
Merck: 14,527
Density: 2.01 g/mL at 25 °C
Class: Specialty Chemicals
Function: Preservative
Industry: Industrial, Organics
Related compounds of Ammonium Hexafluorosilicate:
Other cations:
Hexafluorosilicic acid
Sodium fluorosilicate
Names of Ammonium Hexafluorosilicate:
IUPAC name:
Ammonium hexafluorosilicate
Other names:
Ammonium hexafluorosilicate
Ammonium fluosilicate
Ammonium silicofluoride
