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Pyroarsenic Acid

    • Product Name Pyroarsenic Acid
    • Alias Arsenic acid pyro
    • Einecs 236-333-6
    • Mininmum Order 1 g
    • Factory Site Tengfei Creation Center,55 Jiangjun Avenue, Jiangning District,Nanjing
    • Price Inquiry admin@sinochem-nanjing.com
    • Manufacturer Sinochem Nanjing Corporation
    • CONTACT NOW
    VTB
    Specifications

    HS Code

    902052

    Chemical Name Pyroarsenic Acid
    Chemical Formula H4As2O7
    Iupac Name Tetrahydroxy(dioxo)diarsenic
    Molar Mass 229.84 g/mol
    Appearance Colorless solid
    Melting Point Variable, decomposes on heating
    Solubility In Water Soluble
    Density 2.56 g/cm³ (approximate)
    Cas Number 13598-36-2
    Acidity Pka 1.4 (first dissociation)
    Odor Odorless
    Oxidation State Of Arsenic +5

    As an accredited Pyroarsenic Acid factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.

    Packing & Storage
    Packing Pyroarsenic Acid is packaged in a 500g amber glass bottle, tightly sealed, with hazard labels and safety information clearly displayed.
    Shipping Pyroarsenic acid should be shipped as a hazardous chemical under appropriate regulations. It must be packed in tightly sealed, corrosion-resistant containers and labeled according to UN Hazard Class 6.1 (toxic substances). Keep away from incompatible materials, heat, and moisture. Transportation requires proper documentation and compliance with local, national, and international shipping guidelines.
    Storage Pyroarsenic acid should be stored in a tightly sealed, corrosion-resistant container, clearly labeled, and kept in a cool, dry, well-ventilated area away from heat, moisture, and incompatible substances such as strong bases and reducing agents. Store away from food and combustible materials. Proper personal protective equipment should be available, and the storage area should be equipped for spill containment and emergency response.
    Application of Pyroarsenic Acid

    Applications of Pyroarsenic Acid in Industrial Manufacturing

    Pyroarsenic acid is primarily utilized as a specialty raw material within specific segments of the non-ferrous metallurgy, semiconductors, specialty glass, laboratory reagents, and chemical synthesis sectors. Our production process ensures high purity and controlled batch consistency, supporting the stringent requirements of these downstream industries. Below, we detail the main use cases, compliance standards, dosage practices, process integration points, and end product types for each principal application scenario.

    1. Metallurgical Processing for Complex Ore Smelting

    In metallurgical industries, pyroarsenic acid serves as a fluxing and precipitating agent for the treatment of precious and non-ferrous metal ores containing arsenic, such as those found in copper, gold, and lead extraction. Operations use it to manage arsenic distribution during roasting, smelting, and refining, enhancing impurity removal efficiency and reducing operational hazards from volatile arsenic compounds.

    Industry compliance standards

    • ISO 9001:2015 Quality Management Systems for industrial chemical processing
    • REACH Regulation (EC) No 1907/2006 (Annex XVII restrictions on arsenic compounds)
    • OECD Guidelines for the Testing of Chemicals (Arsenic analysis and waste protocols)
    • Applicable national environmental discharge and handling standards (e.g., US EPA RCRA, China GB 25467)

    Typical usage ratio

    • Dosage ranges from 0.2%–0.6% w/w relative to the ore batch, adjusted based on arsenic content and desired impurity fractionation targets.

    Downstream process integration

    • Direct addition to reaction vessels during sulfuric acid leaching and oxidative roasting. Introduced prior to high-temperature smelting or during impurity precipitation stages in electrolytic refining circuits.

    Final product types

    • Electrolytic copper, doré bullion, lead ingots, gold concentrates with reduced arsenic content.

    2. III-V Semiconductor Compound Synthesis

    Within electronic materials manufacturing, pyroarsenic acid acts as a controlled arsenic source for the preparation of III-V semiconductor precursors such as gallium arsenide (GaAs) and indium arsenide (InAs). Laboratories and fabs utilize its high reactivity for vapor-phase epitaxy and single crystal growth, where trace metallic and oxide impurities must be minimized to parts-per-billion levels for device-grade substrates.

    Industry compliance standards

    • SEMI C41: Specification for Grade 6N-7N semiconductor chemicals
    • RoHS Directive 2011/65/EU (Restriction of hazardous substances in electronic equipment)
    • IEC 60747-5 Semiconductor devices standard
    • Internal corporate quality control SOPs for trace metals and particulates

    Typical usage ratio

    • 0.01–0.05 molar equivalents relative to the group III metal precursor, precisely metered to balance stoichiometry and growth rate in MOCVD or LEC furnace conditions.

    Downstream process integration

    • Intensively purified and dosed into quartz or graphite reaction cells for direct vaporization or surface deposition, preceding carrier gas and substrate introduction steps.

    Final product types

    • Single crystal GaAs wafers, InAs ingots, photodetector substrates, LED epitaxial layers.

    3. Specialty Optical Glass Manufacturing

    The glass industry employs pyroarsenic acid as a fining and refining agent to remove micro-bubbles and control coloration in high-performance lead crystal and specialty optics production. Its chemical properties help stabilize melts, prevent devitrification, and reduce iron-induced discoloration during batch melting.

    Industry compliance standards

    • EN 572-1:2016 Glass in building – Basic soda lime silicate glass products (for specialty compositions)
    • ASTM C1036-16 Standard specification for flat glass (where arsenic use is permitted)
    • EU REACH Annex XVII/ELV Exemptions (where relevant for specialty optic grades)
    • Internal batch traceability and worker exposure SOPs per ISO 45001

    Typical usage ratio

    • 0.05–0.2% by glass batch weight, optimized for melt composition, targeted haze elimination, and desired transmission properties.

    Downstream process integration

    • Bathed directly into the primary melting tank at controlled temperature ramping, in parallel with oxidizing agents and colorants. Homogenized for 30–90 minutes before forming operations.

    Final product types

    • High-refractive lens blanks, precision optical fibers, specialty laboratory glassware, camera optic elements.

    4. Laboratory Analytical Reagents and Standards

    Analytical laboratories source pyroarsenic acid as a certified standard and reagent for wet chemical analysis. It is used in redox titration protocols, trace arsenic determination, and specialized oxidative procedures in water and soil testing. High batch reproducibility and low secondary metal contamination are critical for accredited testing labs.

    Industry compliance standards

    • ISO/IEC 17025:2017 General requirements for the competence of testing and calibration laboratories
    • AOAC Official Methods for arsenic determination in environmental matrices
    • EPA SW-846 Method 7060A: Arsenic (Atomic Absorption, Furnace Technique)
    • Manufacturing under GMP and GLP conditions for reagent production

    Typical usage ratio

    • Concentration and dosage determined by analytical method, typically used as 0.05–0.1 M standard solutions and as spike or calibration standards in the low mg/L to μg/L range.

    Downstream process integration

    • Measured dilution and formulation of ready-to-use certified reference materials. Preparation performed in ISO class 5–7 cleanrooms for critical applications.

    Final product types

    • Primary and secondary reference solutions, titration standards, trace analysis calibration kits, high-purity titrants.
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    Certification & Compliance
    More Introduction

    Pyroarsenic Acid: Manufacturing Excellence and Real-World Value

    Our Perspective on Pyroarsenic Acid

    Pyroarsenic acid, with the formula H4As2O7, often enters chemical discussions in niche contexts, but very few in the market actually work at the heart of production. Day in and day out, we see this compound handled not as a line on a spec sheet, but as a product of years of refinement and vigilance over safety, purity, and process control. There is no shortcut to making reliable pyroarsenic acid—our teams interact directly with every batch and every evolving application, and we know what stands behind a drum or drum label.

    We offer pyroarsenic acid in a range of purity grades tailored to suit industrial and research needs. Our standard model has become known for consistency in both laboratory-scale and production-scale settings. Chemists ask about its arsenic pentoxide assay, moisture content, solubility, and residue after evaporation. Every parameter matters. And none of it happens by magic—every step, from raw arsenic trioxide acquisition to final crystallization, takes careful measurement and adjustment.

    How We Make a Difference in Quality

    Over years, we have honed our crystallization and dehydration processes to avoid problematic byproducts and keep contaminant levels at a minimum. Every shipment springs from rigorous raw material testing, monitored furnace conditions, and staged moisture removal. Pyroarsenic acid does not tolerate sloppy technique; even trace interference can show up as an off note in high-end glass manufacturing or as background in mineral analysis labs. To customers seeking high purity for specialized work—such as trace metal analysis—the reliability of a manufacturer’s process means the difference between a useful reagent and a wasted research cycle.

    For pyrometallurgists, researchers, or tech developers looking at heavy metal extraction, our product brings consistency across batches. Every kilogram shipped has endured characterization for arsenic oxidation state, absence of phosphate interference, and validated stability under various transport conditions. Our internal data shows long-term chemical stability in sealed containers when stored according to recommendations, reducing the risk of material loss or degradation upon arrival at the customer’s facility.

    Applications That Drive Innovation

    Pyroarsenic acid finds a home in both classic and emerging applications. In traditional glass formulation, its role as a clarifying agent can outperform alternate arsenic compounds thanks to reliable oxygen release and improved solubility. In mineral analysis, it plays a key part in dissolving refractory ores. Our research colleagues confirm that switching from other arsenic acids to our product can cut sample preparation time for geochemists, boosting both throughput and reproducibility.

    In the metals industry, pyroarsenic acid supports selective precipitation of specific elements, giving process chemists greater accuracy over separation protocols. It also holds value in analytical reference material production, where small impurities from poorly-manufactured batches can induce wide error margins. We have partnered with laboratories committed to environmental compliance, helping them maintain accuracy when measuring arsenic content in soils and water. Our ability to ship product that maintains its character across delivery zones reduces variance in test results—a real advantage in regulatory environments that require defensible laboratory outcomes.

    Pyroarsenic Acid Versus Other Arsenic Compounds

    Many newcomers ask how pyroarsenic acid stacks up against arsenic trioxide or arsenic acid. The differences go well beyond formulae. While arsenic trioxide serves as a starting point, its crowded impurity profile often trips up downstream synthesis. Arsenic acid, although widely supplied, lacks the dehydration stability and reactivity profile needed in several niche processes. Pyroarsenic acid brings stronger dehydration, granting added control for anyone trying to tune redox reactions or manage residual water.

    We have seen examples where substituting pyroarsenic acid in classical glassmaking led to brighter clarity and more stable melt chemistry, allowing for better oversight in mass production. Our partners in specialty ceramics and pigments have reported fewer color shifts and improved product uniformity compared to arsenic trioxide-derived ingredients. Feedback from academic laboratories indicates that using our high-purity pyroarsenic acid cut background interference in spectroscopy protocols.

    Scale-up specialists know that stability during storage and transport matters. Pyroarsenic acid provides less vapor loss and less shift in water content than some alternatives. Our attention to packaging—using moisture-tight containers and rapid-batch handling—adds another layer of reliability.

    Addressing Real-World Handling and Safety

    Manufacturing any arsenic compound requires strict attention to occupational safety and process containment. Each employee undergoes training in controlled air systems, leak detection, and safe decanting protocols. Our facilities operate continuous air monitoring—arsenic exposure leaves no margin for error. We commit to transparent practices, reporting on-site test results to local regulators and workplace safety panels. Few chemical risks draw as much scrutiny as arsenic, and experience has proven to us that documentation is as important as engineering controls in building trust.

    We continue to invest in waste minimization, exploring avenues for recovery and treatment of secondary streams. Pyroarsenic acid itself represents an upgrade in efficiency in some flowsheets—its high reactivity allows for shorter process cycles and permits smaller volumes in some applications, reducing overall inventory risk. For customers managing hazardous materials inventories, that improvement translates to safer sites and simpler compliance checks.

    Problems in the Broader Market—and What Can Be Done

    If our industry has learned anything, it is that the market for arsenic derivatives hosts both specialist producers and those who simply batch and bottle. Differences in production sequence, source material, and quality control lead to wide variations across offerings. Some resellers blend mixed grades without full analysis, resulting in out-of-spec shipments or batches contaminated with phosphorus and silica. We receive regular reports of subpar material that disrupted glass batch trials or blunted research efforts. On the regulatory side, incomplete documentation—lack of batch traceability or missing safety analysis—can delay delivery or invite fines.

    Facing these issues, manufacturers who control their own process can offer reliable chain-of-custody and transparent lab data. Our teams trace every lot from source to shipment, and we report every impurity above accepted government or customer thresholds. Feedback from industry groups tells us that regular proficiency testing and public accountability keep standards high. While not every competitor follows this ethos, our experience shows that diligence builds confidence among technical customers, and that confidence outlasts market dips or logistical fluctuations.

    Material Science and Customer Collaboration

    Routine partnerships with end users keep our quality standards aligned with practical application. We do not stop at a product’s theoretical use: we regularly test new procedures in our pilot labs, simulating extreme batch conditions or process upsets, so that customers do not face surprises during scale-up or troubleshooting. Failures under test conditions offer valuable lessons; they help us improve packaging, support stabilization agents, and flag potential transport hazards before a truck or container ever leaves our gates.

    Technical support thrives on honest communication. We bring together analytical chemists, process engineers, and regulatory managers to answer application questions, offer test data, or discuss custom packaging. We have handled urgent requests—unplanned plant outages, laboratory restock emergencies, or documentation needs during regulatory audits. By directly operating our manufacturing and logistics, we shorten feedback cycles, offering advice based on observed rather than hypothetical scenarios.

    Sustainability and Forward Movement

    The environmental impact of every process sits under the microscope these days. Regulatory pressure on heavy metals keeps increasing, and public understanding now shapes many procurement and research decisions. Our sustainability work includes not just waste minimization but efforts to substitute lower-impact energy input and explore circular use of arsenic byproducts. We participate in industry workgroups seeking to lower overall hazard footprints without sacrificing product integrity.

    We have made strides in reducing residual arsenic emissions, linking process improvements with water and energy savings. Reuse of aqueous effluent, lowered furnace temperatures, and reduction of fugitive dust keep both public risk and employee exposure in check.

    What Sets Our Manufacturing Apart

    Manufacturing specialty chemicals such as pyroarsenic acid builds on a foundation of trust between producer and user. We maintain deep technical records on process stability, impurity profiles, and batch traceability. Continuous process control eliminates guesswork—timing, temperature, and reactant purity are logged and reviewed in real time. Rapid response to customer technical requests and a willingness to engage in problem solving, not just order taking, distinguish vertically integrated producers from mere handlers of chemical inventory.

    Years of shipping to diverse destinations—laboratories, glass plants, extractive metal processors—have highlighted the importance of understanding regulatory climates across borders. Supporting documentation runs as deep as customer need requires, often exceeding baseline regulations. Our technical staff remains accessible for remote audits, providing reassurance on specification adherence or handling procedures.

    Challenges and Solutions: Toward a Better Industry Standard

    As regulations tighten, the ability to demonstrate sustainable, tightly-controlled production will separate manufacturers who engage closely with their community and customers from those who rely on distance and resellers. Many facilities around the world still lack secondary containment or maintain only sporadic batch records. We have learned from incidents in the field—unexpected container corrosion, transit delays, off-specification readings—by investing in better material handling and container selection. Our trucks leave the plant only after all relevant documentation, from MSDS to trace impurity reports, is reviewed and verified by technical staff.

    The challenge of educating newer buyers and researchers remains. Bidding wars sometimes undercut quality with off-grade shipments. We regularly host webinars and on-site training for those wishing to learn about critical handling, assay methods, and safe disposal, leveraging open-source analytics where proprietary restraints are not a barrier. By bringing our production expertise directly to those who use the product, we hope to set a precedent for plain talk, clear expectations, and high standards.

    Conclusion: Real Value Goes Beyond the Barrel

    Pyroarsenic acid does not solve every technical problem. Yet, its role as a specialty chemical cannot be dismissed by anyone working in advanced materials, analytical sciences, or industrial processing. Our years in manufacturing have taught us that real progress comes not from the sale of a bulk commodity but from the guarantee that each delivery meets stated goals, respects safety, and supports innovation. Our continuing investment in process refinement, documentation, and long-term user relationships forms the true difference between mere supply and actual partnership in progress. For every project or batch that depends on high-purity arsenic chemistry, a trusted manufactured product becomes more than just a reagent—it is a critical building block in achieving reliable, documented, and forward-looking outcomes.