Fluosilicic acid
Fluosilicic acid (CAS: 16961-83-4, Formula: H2SiF6) is a strong inorganic acid with a molar mass of 144.09 g/mol. Available as an aqueous solution with an assay typically between 33.5-35%, it is a corrosive and toxic compound. It finds application in various industrial processes including water treatment for fluoridation, metal surface treatment, and as a reagent in chemical synthesis.
- IUPAC
- Fluorosilicic acid,Hexafluorosilicic acid,Hydrogen hexafluorosilicate
- Synonyms
- Fluorosilicic acidHexafluorosilicic acidHydrogen hexafluorosilicate
Water Fluoridation
Fluosilicic acid is commonly used in municipal water treatment facilities to introduce fluoride ions, which help prevent tooth decay in the general population.
Metal Surface Treatment
It acts as a pickling agent for metals, particularly for steel, to remove rust and scale. It is also used in the treatment of non-ferrous metals like aluminium and magnesium.
Chemical Synthesis
As an inorganic acid, it serves as a precursor or reagent in the synthesis of various organosilicon compounds and other specialty chemicals.
Glass and Ceramic Etching
Its corrosive properties make it useful in the etching of glass and in certain ceramic manufacturing processes.
| Molecular weight | 144.09 |
|---|---|
| Linear formula | H2SiF6 |
| Assay | 33.5-35% |
| Density | 1.22 g/mL at 20 °C(lit.)1.31 g/mL at 25 °C |
| Concentration | 20-25 wt. % in H2O |
| Impurities tested | ≤0.003% heavy metals (as Pb) |
Hazard statements
- H302Harmful if swallowed
- H311Toxic in contact with skin
- H314Causes severe skin burns and eye damage
Precautionary statements
- P280Wear protective gloves, clothing and eye/face protection
- P305IF IN EYES
- P310Immediately call a POISON CENTER or doctor
| Protective equipment | Faceshields, full-face respirator (US), Gloves, Goggles, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Transport (UN / ADR) | UN 1778 8 / PGII |
| Water hazard class (WGK, DE) | 2 |
| Hazard codes (EU) | C |
| Risk statements (R) | 20/21/22-35 |
| Safety statements (S) | 26-36/37/39-45 |
| Cation traces | Fe: ≤100 mg/kg |
| Anion traces | chloride (Cl-): ≤100 mg/kgphosphate (PO43-): ≤1000 mg/kgsulfate (SO42-): ≤100 mg/kg |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Fluosilicic acid used for?
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Fluosilicic acid is primarily used for water fluoridation, metal surface treatment, and as a reagent in chemical synthesis.
What is the CAS number and formula for Fluosilicic acid?
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The CAS number for Fluosilicic acid is 16961-83-4, and its chemical formula is H2SiF6.
What grade and purity does Tech Serve Solutions supply for Fluosilicic acid?
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Tech Serve Solutions supplies Fluosilicic acid with an assay of 33.5-35%. We do not represent this product as USP, BP, or EP grade.
What are the main safety hazards when handling Fluosilicic acid?
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Fluosilicic acid is dangerous; it is corrosive, toxic if swallowed, and causes severe skin burns and eye damage. Appropriate personal protective equipment, including gloves, eye protection, and respiratory protection, must be used. Always consult the Safety Data Sheet (SDS) before handling.
How is Fluosilicic acid packed, shipped, and exported by TSS?
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Fluosilicic acid is shipped as UN 1778, hazard class 8, Packing Group II, according to ADR regulations. TSS exports globally, adhering to all relevant transport and regulatory requirements.
How can I request a sample or quote for Fluosilicic acid?
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To request a sample or quote, please contact our sales team through the website or by phone, providing your specific requirements.
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