Hydrofluorosilicic Acid 23% (HFS)

Product Overview

Hydrofluorosilicic Acid 23% (HFS) is a highly corrosive, aqueous solution of fluorosilicic acid, widely utilized across various industrial and municipal sectors. As a primary agent for industrial fluoridation, this inorganic compound requires precise handling and deep technical understanding due to its strong acidic profile and fuming nature. Alliance Chemical supplies high-quality HFS to meet the rigorous demands of industrial processing, surface preparation, and pH adjustment within our catalog of industrial acids.

Characterized as a colorless, fuming liquid with a penetrating, pungent odor, this chemical is highly reactive and requires robust materials of construction for storage and transport. Alliance Chemical coordinates safe and efficient distribution of this asset across our network, ensuring that your chemical supply chain remains uninterrupted. We provide access to comprehensive documentation, helping industrial operations maintain regulatory compliance while managing hazardous materials. Whether utilized in glass etching, metal cleaning, or municipal water fluoridation, this compound delivers consistent, high-strength performance across diverse manufacturing landscapes.

Why This Grade

The 23% concentration of Hydrofluorosilicic Acid is the standard industrial dilution optimized for stability, handling convenience, and material compatibility. Lower concentrations introduce excess water into industrial processes, which can dilute active baths and compromise the efficiency of surface treatments or chemical synthesis. Conversely, higher concentrations of fluorosilicic acid exhibit significantly higher vapor pressures, making them highly volatile, prone to excessive outgassing, and extremely dangerous to store and handle without highly specialized pressurized equipment. Purchasing the pre-formulated 23% concentration provides the optimal balance between chemical activity and operational safety.

Using an incorrect or unverified concentration can lead to severe operational failure modes, including the rapid degradation of process piping, under-fluoridation in municipal applications, or incomplete descaling in metal finishing operations. Standardizing on Alliance Chemical's Hydrofluorosilicic Acid 23% (HFS) ensures predictable dosing metrics, allowing automated monitoring systems to maintain exact chemical limits. Unrefined or off-spec grades can introduce heavy metal contaminants, leading to catalyst poisoning or unwanted secondary precipitates in your chemical reactions. By choosing this carefully controlled 23% dilution, facilities minimize deposit risks in dosing pumps and protect downstream mechanical infrastructure from premature corrosive failure.

Industrial Applications

• Municipal Water Fluoridation: Employed by municipal water systems to adjust fluoride levels to standard target concentrations for municipal water treatment programs, read more about our industrial water treatment products.
• Metal Cleaning and Etching: Utilized in the metal finishing industry for oxide removal, surface preparation, and etching of silicon wafers in electronics.
• Ceramics and Cement Hardening: Formulated into industrial concrete treatments to accelerate curing times, harden surfaces, and improve overall structural density.
• Wood Preservation: Used as an active ingredient in wood preservation formulations to protect structural timbers from wood-boring insects and rot.
• Chemical Intermediate Synthesis: Serving as a critical precursor for manufacturing aluminum fluoride, synthetic cryolite, and other specialized fluorinated compounds.

Hazmat & Shipping

Hydrofluorosilicic Acid 23% is highly regulated for transport due to its aggressive corrosive properties toward metals and biological tissue. It is officially classified under United States Department of Transportation (DOT) and international regulations as UN1778, Hazard Class 8, Packing Group II, with the proper shipping name Fluorosilicic acid. The mandatory signal word is DANGER. Alliance Chemical coordinates all logistics in strict compliance with hazmat shipping mandates, utilizing dedicated carriers and DOT-approved containers to ensure safe transit from our facilities to your receiving dock.

Because this substance carries the hazard statement H314 (Causes severe skin burns and eye damage), personnel must utilize rigorous personal protective equipment (PPE) during any transfer or handling operations. Mandated safety gear includes chemical-resistant splash goggles, full-face shields, heavy-duty neoprene or nitrile gloves, and acid-resistant aprons or full protective suits. Standard operating procedures must dictate that a safety shower and eye wash station be immediately accessible in the handling area. Proper respiratory protection, such as a self-contained breathing apparatus or an acid-gas respirator, must be worn if fumes or vapors exceed permissible exposure limits.

Handling & Storage

Storage of Hydrofluorosilicic Acid 23% must occur within a controlled temperature range, ideally between 40°F and 90°F, to prevent crystallization and minimize fuming. Compatible container materials include high-density polyethylene (HDPE), polypropylene, or rubber-lined steel; glass, stoneware, and most common metals are highly incompatible and will suffer rapid corrosive attack. Keep containers tightly closed in a dry, cool, and well-ventilated area, away from strong bases, strong oxidizing agents, and reactive metals. Secondary containment is highly recommended to mitigate spill risks.

Order & Documentation

At Alliance Chemical, we prioritize regulatory transparency and operational safety for all clients. A detailed Certificate of Analysis (COA) is available upon request to verify physical and chemical specifications for your specific lot, and a safety data sheet (SDS) is provided with every order we ship. To proceed with your procurement needs, you can Request a Quote or Download the SDS to review safe handling guidelines.

Why Buy from Alliance Chemical

Since 1997, Alliance Chemical has supplied premium industrial chemicals from Taylor, Texas under CAGE Code 1LT50, with a COA and SDS included on every order. For industrial use only.