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Commercial Fulfillment Snapshot
Buy Hydrofluorosilicic Acid 23% (HFS) with faster decisions and fewer back-and-forth emails.
Ships from Taylor, Texas. In-stock orders placed before 1:00 PM CT (Mon-Thu) and before 12:00 PM CT (Fri) typically ship same business day. Order online 24/7.
Who Buys This
- Municipal water treatment facilities
- Industrial chemical manufacturers
- Metal finishing & electroplating shops
- Environmental remediation companies
- Laboratory testing facilities
Purity / Grade Guide
- Industrial & lab applications
- Verified purity, COA included
- Suitable for commercial processes
- 23% concentration for balanced handling
Pack Sizes
- 1 Quart: lab & small jobs
- 1 Gallon: shop & maintenance
- 5 Gallon: production & regular use
- 15 Gallon: mid-volume operations
- 55 Gallon: bulk drum
- 275 Gallon: high-volume tote
- 330 Gallon: max-volume tote
SDS / COA / TDS
- UN 1778 Class 8 packaging
- Complete SDS with every order
- Certificate of Analysis included
- Corrosive liquid transport requirements
Small Packs: UPS Ground nationwide for pints, quarts, and gallons.
LTL / FTL: ABF, SEFL, Saia, XPO, and partner carriers for pails, drums, totes, and full truckloads.
Support: Email or call for freight options, hazardous-material routing, and lead-time confirmation.
Product Overview
Hydrofluorosilicic Acid 23% (HFS) is a colorless, aqueous solution of fluorosilicic acid (H₂SiF₆), designed for precise fluoride delivery in industrial and municipal applications. Also known as Hexafluorosilicic Acid, this product serves as a primary precursor in the synthesis of fluorinated organic and inorganic compounds and is the standard agent for water fluoridation programs.
Our HFS formulation delivers a consistent 23% assay with strict color control (APHA ≤ 8), ensuring compatibility with sensitive downstream processes. With a density of approximately 1.15 g/mL, it allows for accurate volumetric dosing in continuous flow systems. This material is widely used in metal finishing for corrosion inhibition, electroplating, and pH adjustment in environmental management systems.
Alliance Chemical supplies Hydrofluorosilicic Acid in high-density polyethylene (HDPE) packaging ranging from 1 quart to 330-gallon totes to suit any scale of operation. All shipments include a comprehensive Safety Data Sheet (SDS) outlining proper handling for this corrosive material.
Key Properties
- Chemical Formula: H₂SiF₆
- CAS Number: 16961-83-4
- Concentration: 22.5 – 23.5% (Typical 23%)
- Appearance: Colorless liquid
- Molecular Weight: 144.28 g/mol
- Density (25°C): 1.15 g/mL
- Specific Gravity: 1.15 – 1.20
- pH: Acidic (Controlled by formulation)
- Solubility: Fully soluble in water
Common Applications
- Municipal Water Fluoridation: Used to adjust fluoride levels in drinking water systems according to municipal and regulatory guidelines.
- Chemical Synthesis: Acts as a high-purity source of fluorine for synthesizing fluorosilicates and other fluorinated compounds.
- Metal Surface Treatment: Utilized in electroplating baths and hardening cement/concrete surfaces.
- Corrosion Inhibition: Integrated into processing streams to provide fluoride-based protection in metal finishing.
- pH Adjustment: Employed in industrial water treatment to stabilize pH levels while delivering fluoride ions.
Safety Precautions
Hydrofluorosilicic Acid is corrosive and must be handled with strict adherence to safety protocols. Store in a cool, dry, well-ventilated area away from direct sunlight in original HDPE containers. Avoid contact with strong bases, glass, ceramics, and oxidizing agents.
Personal Protective Equipment (PPE): Always wear chemical-resistant gloves, splash goggles, face shields, and protective clothing when handling this product. Ensure emergency eyewash stations and safety showers are accessible.
Transport & Handling: Classified as UN 1760, Corrosive liquid, n.o.s. (Hydrofluorosilicic Acid), Class 8, PG II. Refer to the Safety Data Sheet (SDS) for detailed emergency response, spill containment, and first-aid procedures.
Benefits
Consistent Assay: Manufactured to a tight 23% concentration for reliable dosing calculations.
Versatile Packaging: Available in small pack sizes for lab use and bulk drums/totes for plant operations.
High Purity: Low residue and controlled impurities support demanding chemical synthesis and treatment applications.
Regulatory Support: Fully documented with SDS and Certificates of Analysis (CoA) available upon request.
Related Products
| Property | Value |
|---|---|
| Molecular Weight | 144.08 g/mol |
| Formula | H2SiF6 |
| Assay | 23% |
| Grade | Technical |
| Form | Liquid |
| Solubility | Soluble in water and alcohol |
| Appearance | Colorless, fuming liquid |
| Melting Point | -20 °C |
| Boiling Point | 108 °C |
| Specific Gravity | 1.12 |
| Industry | Environmental, Industrial, Wastewater |
Frequently Asked Questions About Hydrofluorosilicic Acid 23% (HFS)
What is Hydrofluorosilicic Acid 23% (HFS) and what is its chemical formula?
Hydrofluorosilicic Acid 23% (HFS) is a chemical compound with the molecular formula H2SiF6, registered under CAS Number 16961-83-4 by the Chemical Abstracts Service (PubChem), with a molecular weight of 144.08 g/mol. Alliance Chemical supplies Hydrofluorosilicic Acid 23% (HFS) in Technical grade for laboratory, industrial, and commercial applications.
What are the physical properties of Hydrofluorosilicic Acid 23% (HFS)?
According to the NIOSH Pocket Guide to Chemical Hazards, Hydrofluorosilicic Acid 23% (HFS) is supplied as a colorless, fuming liquid. It has a melting point of -20°C, a boiling point of 108°C. The specific gravity is 1.12 relative to water. Solubility: Soluble in water and alcohol.
What grade and purity of Hydrofluorosilicic Acid 23% (HFS) does Alliance Chemical offer?
Alliance Chemical offers Hydrofluorosilicic Acid 23% (HFS) in Technical grade with a purity assay of 23%. Every lot ships with a Certificate of Analysis (COA) and Safety Data Sheet (SDS) prepared in accordance with OSHA Hazard Communication Standard 29 CFR 1910.1200 and GHS Revision 7. Download SDS.
What are common industrial applications of Hydrofluorosilicic Acid 23% (HFS)?
Hydrofluorosilicic Acid 23% (HFS) serves a wide range of sectors, including Environmental, Industrial, and Wastewater.Alliance Chemical provides the documentation and quality certifications required for use in regulated environments.
What PPE is required when handling Hydrofluorosilicic Acid 23% (HFS)?
OSHA-mandated PPE per 29 CFR 1910.132-138:Chemical-resistant gloves (20+ mil neoprene or PVC), full face shield over safety goggles (ANSI Z87.1), acid-resistant apron or chemical suit, closed-toe chemical-resistant footwear. Emergency eyewash station and safety shower must be accessible within 10 seconds per ANSI Z358.1. Consult the SDS available from Alliance Chemical for complete PPE requirements.
What are the storage requirements for Hydrofluorosilicic Acid 23% (HFS)?
Store perOSHA 29 CFR 1910.1450: Dedicated corrosives cabinet with secondary containment (110% volume per EPA 40 CFR 264.175). Temperature range:15-25°C. Segregate from:bases, reactive metals, organic materials. Maximum storage:2-3 years unopened.
What is the emergency spill procedure for Hydrofluorosilicic Acid 23% (HFS)?
Emergency response per EPA SPCC (40 CFR 112) and OSHA 29 CFR 1910.120: (1) Alert personnel, evacuate area to 50 feet. (2) Eliminate ignition sources if flammable. (3) Don PPE per SDS Section 8. (4) Stop leak if safe; use emergency shutoffs. (5) Contain with non-combustible absorbent materials, dike with sand/earth. (6)Carefully neutralize with sodium bicarbonate (5-10% solution), monitor exothermic reaction. (7) Collect in DOT-approved containers, label as hazardous waste. Check 40 CFR 302.4 for Reportable Quantity. Emergency: Chemtel 1-800-255-3924 (24/7). Non-emergency: Alliance Chemical 512-365-6838.
What is the DOT shipping classification for Hydrofluorosilicic Acid 23% (HFS)?
DOT Classification per 49 CFR 172.101:See SDS Section 14 for specific UN number, Hazard Class8 (Corrosive), Packing GroupII/III. Requires: Hazmat shipping papers (49 CFR 172.200), UN specification packaging (49 CFR 173), hazmat labels (172.400). Alliance Chemical ships all orders in DOT-compliant packaging with proper documentation.
How must Hydrofluorosilicic Acid 23% (HFS) waste be disposed?
Disposal per RCRA (40 CFR 261-265):Characteristic waste D002 (Corrosive, pH ≤2 or ≥12.5). Generator requirements: EPA ID number required if >100 kg/month (40 CFR 262.12). Use EPA-permitted Treatment, Storage, Disposal Facility (TSDF). Never discharge to sewer without POTW written approval (40 CFR 403). Container disposal: Triple rinse (40 CFR 261.7), offer for reconditioning/recycling. State regulations may be more stringent — check with your local environmental agency. Consult the Alliance Chemical SDS for product-specific disposal guidance.
Does Alliance Chemical provide an SDS and COA for Hydrofluorosilicic Acid 23% (HFS)?
Yes. Alliance Chemical provides a Safety Data Sheet (SDS) and Certificate of Analysis (COA) for every lot of Hydrofluorosilicic Acid 23% (HFS). The SDS is prepared in accordance with OSHA Hazard Communication Standard 29 CFR 1910.1200 and the Globally Harmonized System (GHS) Revision 7, covering all 16 required sections including hazard identification, first aid measures, firefighting measures, handling and storage, exposure controls, and regulatory information. The SDS is available for download directly from this product page. COAs are available upon request by contacting Alliance Chemical at 512-365-6838.
STX-Z79-T3R
$17.02
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