Hexafluorosilicic acid (CAS#16961‑83‑4)
It is an inorganic acid. It is used for public water fluoridation to reduce dental caries and fluorosis. It serves as raw material to make aluminium fluoride, cryolite and various hexafluorosilicates, silicon and silica. It works as electrolyte for lead refining in the Betts process, and as a reagent to break Si‑O bonds of silyl ethers in organic synthesis.
Hexafluorosilicic acid Chemical Properties |
Boiling point | 108-109°C |
density | 1.22 g/mL at 20 °C (lit.) 1.31 g/mL at 25 °C |
vapor pressure | 23hPa at 19.85℃ |
refractive index | 1.3500 |
Fp | 108-109°C |
storage temp. | −20°C |
solubility | H2O: 1 mg/mL, clear, colorless |
form | Liquid |
pka | 1.83[at 20 ℃] |
color | Clear colorless |
Specific Gravity | 1.38 (40%) |
Water Solubility | Miscible with water. |
Hydrolytic Sensitivity | 0: forms stable aqueous solutions |
Merck | 14,4182 |
Exposure limits | ACGIH: TWA 2.5 mg/m3 |
Stability: | Stable in aqueous solution. |
InChI | 1S/F4Si.2FH/c1-5(2,3)4;;/h;2*1H |
InChIKey | AUJBMDCSBIPDEH-UHFFFAOYSA-N |
SMILES | F.F.F[Si](F)(F)F |
CAS DataBase Reference | 16961-83-4(CAS DataBase Reference) |
EPA Substance Registry System | Fluosilicic acid (16961-83-4) |
Safety Information |
Hazard Codes | C |
Risk Statements | 34-35-20/21/22 |
Safety Statements | 26-36/37/39-45-27 |
RIDADR | UN 1778 8/PG 2 |
WGK Germany | 3 |
RTECS | VV8225000 |
F | 8-10 |
Hazard Note | Corrosive |
TSCA | TSCA listed |
HazardClass | 8 |
PackingGroup | II |
HS Code | 28111990 |
Storage Class | 6.1D - Non-combustible acute toxic Cat.3 |
Hazard Classifications | Acute Tox. 3 Dermal |
Hazardous Substances Data | 16961-83-4(Hazardous Substances Data) |
Toxicity | LD50 oral in rat: 430mg/kg |
Hexafluorosilicic acid CAS#16961‑83‑4
Product Application
Main Industrial Scenarios
Hexafluorosilicic acid serves as a fluoride source for manufacturing various hexafluorosilicate salts. It acts as electrolyte in the Betts electrolytic process for lead refining, and functions as a key organic‑synthesis reagent to cleave Si‑O bonds of silyl ethers. Besides, it is applied for wood preservation and surface modification of calcium carbonate materials.
Extended Application Fields
Water‑treatment industry: Used for public‑water fluoridation to adjust fluoride content in drinking water.
Chemical raw material: Critical feedstock for producing aluminium fluoride, synthetic cryolite, silicon and silicon dioxide.
Surface‑treatment sector: Used in special metal processing and auxiliary agent for ceramic formulation.
Product Specifications & Chemical Properties
Basic Parameters
CAS No.: 16961‑83‑4
Chemical Formula: H₂SiF₆
Appearance: Clear transparent liquid
Molecular Weight: 144.09
Water Solubility: Fully miscible with water
Stability: Stable under proper storage conditions; reacts violently with strong bases, corrosive to most metals and glassware.
Packaging & Transportation
Standard Packaging Options
Common packing options include IBC tote tank and HDPE drum. Custom‑built packaging is available upon customer technical requirement.
UN transport classification: UN 1778, Hazard Class 8, Packing Group II, fully compliant with IMDG and ADR dangerous‑goods shipping rules.
Transport Notes
Operate with anti‑corrosion protective tools to prevent drum damage and liquid leakage. Avoid direct sunlight and high‑temperature environment in transit. Strictly prohibit mixed‑loading with alkalis, metal products, food and feed.
Storage Requirements
Store in cool, well‑ventilated warehouse. Keep containers tightly sealed at all times. Isolate from strong alkalis, metals and glass‑made containers. Keep away from heat source. Storage area shall be equipped with leakage‑collection facilities for emergency handling.
Delivery & After‑sales Service
Lead Time
In‑stock goods: 2‑3 working days
New production order: 7‑10 working days
Our Service Support
Pre‑shipment inspection: Batch‑specific factory test report will be issued before shipment.
Sample support: Small‑volume lab test samples can be provided for evaluation.
Customization: Concentration adjustment is acceptable according to customer process requirements.
After‑sales response: Prompt technical reply for quality‑related feedback after goods arrival.
Document supply: Complete export documents including SDS and batch‑wise COA can be supplied.
Cooperation & Customer Cases
Our hexafluorosilicic acid is steadily supplied to water‑treatment enterprises, fluoride‑salt chemical plants, non‑ferrous‑metal smelters and fine‑chemical manufacturers. Our cooperative clients cover Southeast Asia, Middle East and Latin‑American regions. Different concentration grades can match requirements for water treatment, salt‑making, metallurgy and material‑modification scenarios.
FAQ
Q1: What is your MOQ for hexafluorosilicic acid?
A1: Standard MOQ is 1 FCL. Small trial‑order volume can be negotiated for long‑term potential partners.
Q2: Can concentration of hexafluorosilicic acid be adjusted?
A2: Yes. We support customized concentration according to customer production technology.
Q3: What protective measures are needed during handling?
A3: Wear anti‑acid chemical goggles, corrosion‑resistant gloves and protective clothing. Avoid skin and eye contact. Prevent liquid leakage into soil and water system.
Q4: Can you provide SDS and batch‑specific COA?
A4: Yes. SDS and batch Certificate of Analysis will be provided along with shipping documents.
Q5: What payment terms are available for bulk shipments?
A5: T/T and irrevocable L/C at sight are supported for large‑volume orders.
Safety Reminder
This product is corrosive. It will cause severe burns upon skin and eye contact. Inhalation of vapors will irritate respiratory tract. Operate with adequate ventilation. Waste liquid and contaminated packaging shall be disposed strictly complying with local environmental‑protection regulations simplot.
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