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HS Code |
167380 |
| Chemical Name | Fluorosilicic Acid |
| Chemical Formula | H2SiF6 |
| CAS Number | 16961-83-4 |
| Molar Mass | 144.09 g/mol |
| Appearance | Colorless to slightly yellow liquid |
| Odor | Pungent |
| Density | 1.22 g/cm³ (25°C) |
| Boiling Point | 108°C |
| Melting Point | -15°C |
| Solubility in Water | Miscible |
| pH | Less than 1 (strongly acidic) |
| Common Uses | Water fluoridation, metal treatment, glass etching |
| Hazard Classification | Corrosive, toxic |
| UN Number | 1778 |
| Vapor Pressure | 35 mmHg (20°C) |
As an accredited Fluorosilicic Acid factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Fluorosilicic Acid is packaged in a sturdy, corrosion-resistant 25-liter HDPE drum, featuring hazard labels and a secure screw-cap closure. |
| Shipping | Fluorosilicic acid is shipped in tightly sealed, corrosion-resistant containers, such as polyethylene-lined steel drums or tank trucks, to prevent leaks and reactions with metals. It requires proper labeling and placarding as a hazardous material and is transported according to federal and international regulations for toxic and corrosive substances. |
| Storage | Fluorosilicic acid should be stored in tightly closed, corrosion-resistant containers, such as those made from polyethylene, polypropylene, or rubber-lined steel. Store in a cool, well-ventilated area away from incompatible materials like strong bases and metals. Keep containers tightly sealed and clearly labeled. Take precautions to prevent leaks, spills, and exposure to moisture, and ensure accessible emergency eyewash and shower stations. |
Applications of Fluorosilicic Acid in Industrial ManufacturingFluorosilicic acid serves as an essential raw material across multiple heavy and fine chemical industries. Our production controls focus on purity and on consistency from batch to batch, supporting reliable operation in advanced manufacturing environments. Below are critical application segments where this material delivers specialized chemical functionality. 1. Potable Water FluoridationMunicipal water treatment facilities dose this acid to adjust fluoride content, maintaining target levels for health compliance. As a liquid additive, it dissolves completely and reacts with lime or calcium sources present in water, creating the intended fluoride ion concentration for large-scale urban and rural drinking water systems. Accurate metering and feed control are required to ensure consistent output without excess, and ongoing process sampling forms part of continuous plant operation. Industry compliance standards
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2. Aluminum Smelting and Metal Surface TreatmentAluminum primary smelters and downstream surface finishing plants use the acid to remove oxide films and residual contaminants from metal surfaces. The chemical helps in desmutting, cleaning, and pickling of extrusions, castings, and rolled products prior to anodizing or further coating. The rapid reaction with metallic oxides enables controlled etching and preparation without chloride-related corrosion issues. Bath composition, acid concentration, and contact time rely on workpiece alloy and final finish specification. Industry compliance standards
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3. Fluorine Compound Synthesis (Cryolite / Aluminium Fluoride Production)Producers of essential aluminum smelting additives convert this acid, by neutralization with sodium or aluminum salts, into high-purity cryolite (Na₃AlF₆) and aluminum fluoride (AlF₃). These downstream fluorides enable efficient electrolytic reduction of alumina in Hall-Héroult cells. Production requires close stoichiometry, precise feed control, and post-reaction filtration, drying, and classification. The process supports closed-loop recycling of fluoride values from industrial waste and byproducts. Industry compliance standards
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4. Specialized Glass and Ceramic ManufacturingCertain glassworks and technical ceramic plants utilize the acid as a controlled fluxing and etching agent. Small additions modify the melting point, improve glass workability, and increase product resistance to chemical attack. It also finds use in opal glass and as part of degreasing prior to high-value ceramic firing. High-purity grades are critical to avoid visible product defects, and dosing is tailored for each glass or ceramic formulation batch. Industry compliance standards
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5. Electroplating and Industrial Cleaning ChemistryElectroplating companies apply this acid as an additive in pickling, brightening, and surface activation baths, especially for steel, copper, and specialty alloy substrates. It enhances oxide removal and preps metal surfaces for uniform coating adhesion without chloride-induced stress crack or pitting. Industrial-scale cleaning formulations also incorporate it for heat exchanger descaling and maintenance of chemical plant process equipment. The additive must balance metal reactivity with safety and environmental compliance in spent bath disposal. Industry compliance standards
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6. Agrochemical and Fertilizer ManufacturingProducers of specialized fertilizers employ this acid as a fluorine source in the production of sodium fluorosilicate and other fluorinated compounds used for crop protection and micronutrient formulations. Controlled dosing during synthesis impacts product solubility and nutrient release rates. Process design ensures operator safety and minimizes fluoride emission to the environment. Product applications target regulated agricultural use with detailed labelling and field application protocols. Industry compliance standards
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Producing fluorosilicic acid (H2SiF6) from our own lines gives real insight into what makes this product popular among industrial users. Our plant operates around-the-clock, and every shift starts and ends with rigorous routines for checking the clarity, density, and acidity of each batch. From the start, our approach to producing this acid focuses on meeting key quality markers that customers actually care about: purity, concentration, transparency, and minimal unwanted byproducts. Most shipments run at a standard 23% to 25% solution, and every tank gets checked for haze or sediment. If the acid doesn’t pour crystal clear with the right colorless finish, it doesn’t go out.
We manufacture fluorosilicic acid by capturing hydrogen fluoride gas in a controlled reaction with high-purity silica. Our lines use purpose-built ceramic and steel reactors, which maintain the reaction temperature and pressure for predictable yields and consistent quality. By controlling raw materials right at our door—imported quartz, or locally sourced ones with strict composition controls—we avoid variability. In-house spectrometry follows each batch through key points, so we catch even trace metals or excessive residues well before drums see a label. That sort of process stability keeps customers returning, because one day’s bulk tank won’t deviate from the next.
Fluorosilicic acid rarely gets seen in a pure form at anyone’s worksite, but what users notice is how all the pieces fit together in their operations. Take municipal water authorities: they watch for the right acid concentration, clarity, and flow rates, since any hiccup will end up visible in public water reports. We hear from utility technicians that slow-running feeds or crystallization in their injection pumps means clogged lines, lost time, and sometimes public complaints. The municipal grade we produce runs at a set acid range and gets tested for arsenic, lead, and heavy metals. Shipments undergo extra filtration so they reach waterworks free of granular debris or clouding.
Chemical blending operations require something a little different. Here, the focus is on reactivity and minimum contamination. The cleanest batches feed into aluminum, fertilizer, and general industrial synthesis, where strange odors or residues mean ruined lots and delayed shipments. Our industrial-grade lots undergo double-wash purification to drop impurities lower than industry norms, strengthening downstream reactions and allowing more precise blends.
Our technical team often discusses the industry’s shift between various acids because each comes with pros and cons. Fluorosilicic acid sets itself apart from other fluoride-bearing acids—like hydrofluoric acid or sodium fluoride—mainly due to handling, cost, and regulatory comfort. As a liquid, fluorosilicic acid is easier to meter and store than hydrofluoric acid and comes with less volatility, so it fits well in bulk storage tanks and long-distance shipping. Operators don’t face the same risks as with pure hydrogen fluoride. Sodium fluoride offers another route to fluoridation but puts more solid handling needs and dust risks on the table, which some municipal users try to avoid.
Handling makes up a big share of acid selection. Our crews deal with nearly every acid known to industrial chemistry—phosphoric, sulfuric, nitric, hydrochloric, and organic mixes; none have quite the same profile as fluorosilicic acid. It delivers high concentrations of fluoride in a stable form and can dissolve easily in water lines with little risk of precipitate. If you compare that with old-school solid forms or volatile gases, the reduction in storage headaches becomes clear pretty fast. Transporters, too, see the value, with liquid tanks allowing larger loads and easier tank washing.
Still, every acid has its niche. We see customers coming to us when regulatory paperwork points toward liquid fluoridating agents, when plant safety protocols restrict the use of anhydrous hydrogen fluoride, and when older facilities want to upgrade from bulk powders. On the other hand, some specialist uses require other compounds, and we keep clear lines open with clients about where fluorosilicic acid fits best.
From years on the factory floor, it’s clear that quality assurance doesn’t stop at the lab table. Big buyers send their own techs and independent auditors, who want to see more than titration curves or pH readings. We walk through sample pulls, shipment logs, and maintenance histories—covering every shift’s records on batch cleaning, tank integrity, and worker safety. Many buyers also want live access to test data, including spectrographs of trace contaminants down to parts per billion, as these play a role in everything from food processing certification to capital projects for water treatment upgrades.
Auditors often quiz us about feedstock sources, environmental controls, and the fate of any byproducts or washwater. We put extra effort into capturing and recycling any gas-phase emissions or spent solutions to local partners for responsible reuse. Fines or restrictions are a real concern in chemical manufacturing, and our protocols aim to exceed required standards year after year.
Experience proves that the most important aspects of fluorosilicic acid revolve around predictability in use. At municipal water plants, operators rely on the steady chemistry of our acid to achieve the precise fluoride levels needed for legislative compliance. We field calls from cities monitoring real-time fluoride levels—often down to tenths of parts per million. Dosing systems work far more reliably with a liquid product than with solid forms that can cake or clump, especially in humid regions.
In fertilizer manufacturing, fluorosilicic acid’s value traces directly to its high fluoride content, which helps mobilize other elements in the blends. Fertilizer lines run smoother when the acid incorporates with minimal residue, and we coordinate with process engineers to deliver packaging that matches their dosing equipment. By optimizing acid strength and density, we help them reduce downtime and cleaning frequency between lots.
Industrial cleaning and metalworking see repeated benefits with our acid, mainly due to its ability to remove oxides and scale without introducing more unwanted ions compared to other acids. Customers count on our product to deliver repeat performance—no spotty results, and no random surface corrosion that might compromise finishing or safety.
Handling a highly acidic material like fluorosilicic acid means safety shapes every step of storage and shipping. We train every team member in hazard recognition, acid spillage routines, and emergency first response. Over several years, nearly every incident on the line traces back to overlooked maintenance, open valves, or unexpected wastage—not the product itself failing, but process errors or equipment upsets. We emphasize routine walkarounds, double checks on every fill, and rigorous tank inspections.
Industry benchmarks require double-walled storage and backup containment, so we reinforce our own protocols with real-world drills and ongoing training. Every shift transitions with detailed logs and eye-contact handoffs to prevent missed warnings. Equipment upgrades—such as automatic shutoff valves and high-visibility acid lines—earned a reputation in our industry as vital investments rather than regulatory “red tape.” Supervisors regularly check for early signs of corrosion, leaks, or off-gassing. Each drum, tote, or railcar receives a thorough final inspection before it leaves our dock.
Transport partners receive in-house safety guides and acid-resistant gear. We encourage feedback from truckers and operators, as their close-up experience with loading and delivery provides valuable improvement suggestions. On the rare occasion one of our shipments encounters handling trouble on the road, both our response plan and field contacts get activated within minutes.
Modern chemical manufacturing means tracking every liter from cradle to grave. Fluorosilicic acid production especially comes under environmental scrutiny due to the nature of the byproducts and the transportation scale. We built our facility to capture off-gases in purpose-designed scrubbers using caustic sprays and filtration media, reducing atmospheric release of fluorinated vapors. The spent media gets treated and shipped to specialist recycling plants, keeping us well inside regulatory limits—and providing peace of mind to local neighbors.
Wastewater and run-off from manufacturing undergo neutralization before any controlled release. Every week, third-party labs test downstream samples for fluorides, pH, and trace metals. Results tie directly to our factory bonus system; clean records keep everyone motivated. We publish annual waste reports for our buyers and community partners.
Accidents still challenge the best-run operations. A serious spill or reaction years ago taught us to separate acid lines from water headers and install redundant safeguards. Since adopting these lessons, we have rarely encountered significant issues, and our environmental reports have held strong. Strict records keep our team vigilant, and community trust has grown.
From our technical viewpoint, the differences between fluorosilicic acid and other fluoride sources show up in lab tests, longevity of feed equipment, and consistency of end-product. Users see fewer blockages and less mineral scale, which often means lower maintenance costs over the year. Hydrofluoric acid, for example, demands extensive personal protection protocols for plant operators, and the risk profile in storage rises with temperature swings or physical shocks. On the other hand, sodium fluoride powders require conveyors, dust collection, and special bulk hoppers for dosing—missing out on the benefits of direct injection.
Regulatory agencies and buyers’ auditors explain their growing preference for our liquid acid by mentioning shorter onboarding periods for new staff, improved documentation, and a greater track record for dose accuracy. Fines and compliance failures still occur with solid alternatives, mainly because it’s tougher to control precise feed rates in older dosing gear. We regularly review customer records showing fewer corrective actions and easier audit paths when switching to our product.
Real-world feedback from our partners constantly shapes how we package and deliver fluorosilicic acid. Bulk tankers remain the standard for regional water utilities and fertilizer blenders, offering the highest throughput and the most efficient handoff. Meanwhile, smaller sites favor intermediate bulk containers (IBCs) for flexibility. We’ve invested in improved acid-resistant linings, level sensors, and tamper-evident valves in response to customer input about leaks and losses.
Outbound logistics builds on lessons learned from older packaging methods. We coordinate with logistics specialists so every delivery aligns with the acid’s unique properties. Drivers follow precise routing to minimize transit time, reducing off-gassing and container stress. Maintenance cycles for our tanker fleet run frequent, with spot testing for residues and pressure testing before reloading.
Some buyers with long-term contracts work with us to install dedicated site tanks, pipelines, and metering pumps. Our crews regularly visit for calibration and retraining, ensuring ongoing performance and reliability. Older plants seeking to upgrade consult us on new pipes, sensors, and dosing setups; we share insight based on decades of operation and first-hand troubleshooting.
Supplying fluorosilicic acid is more than just filling orders—it requires ongoing partnership. Our technical support teams answer routine questions about compatibility, pump settings, or spill cleanup. Experienced operators provide training for new water plant techs and industrial users. For novel applications, we run bench-scale tests in our own labs using customer feedstocks, identifying process bottlenecks or contamination risks before they escalate.
Whenever regulatory changes or industry recalls raise questions, our engineers and compliance managers coordinate with buyers to keep documentation up-to-date. We routinely assist with written procedures, training materials, and audit prep sessions. Clients depend on reliable data for annual reviews, so our records remain available and transparent.
Disruption causes headaches for everyone involved in chemical processing. Our inventory management approach emphasizes redundancy—on-site buffer tanks, local warehousing partners, and pre-scheduled delivery cycles. With multi-year contracts, buyers receive forecasted shipment plans and priority support. The value lies in preventing out-of-stock events and maintaining dosage stability. Outages of even a few hours at the municipal level can mean regulatory penalties or costly flushing and re-batching.
We’ve endured transportation strikes, severe weather, and even global shortages of silica feedstocks by diversifying sources and coordinating with local industries. Our management works directly with rail, road, and port operators to avoid border delays, and if needed, we airfreight critical shipments. Every supply hiccup becomes a chance to improve, document weak points, and tighten systems.
We notice that leading cities and manufacturers come back to direct factory sources for the reliability and technical coverage that third-party traders struggle to provide. Our drivers recognize sites and operators by name, making every delivery personal instead of transactional.
Working with fluorosilicic acid has taught us that no two customers use it quite the same way. Every stop at a water treatment site or chemical plant brings a new story—corroded pump seals, improved test results, or new safety hurdles. Starting batches at dawn and wrapping late-night runs leaves our crews with a sense of the product’s importance not just in big industrial settings but in every glass of water and every finished metal part that leaves the assembly line.
We measure success not only in full tanks and clean lab reports, but also in relationships built on honesty, clear communication, and a commitment to safety. Our production lines adapt as industries change, blending tradition and innovation. Most of all, we focus on the practical realities operators face every day, delivering acid that meets their needs with the same careful oversight and pride that marks every turn of a reactor valve.