Hydrofluorosilicic Acid 23% (HFS)

Product Overview

Hydrofluorosilicic Acid 23% (HFS) is a colorless, technical grade 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
• Grade: Technical
• 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.

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