Bismuth Oxide (Bi₂O₃) Supplier & Manufacturer | CAS 1304-76-3 | High-Purity Grades
Bismuth Oxide (Bi₂O₃) – Complete 2025 Technical & Supplier Guide
Bismuth Oxide (Bi₂O₃, CAS 1304-76-3) is a critical high-purity inorganic oxide used across electronics, ceramics, glass manufacturing, solid oxide fuel cells (SOFCs), and pharmaceutical applications. As industries worldwide transition to lead-free materials, demand for Bismuth Oxide has surged—driven by environmental regulations, technological innovation, and 2025 China export controls that have fundamentally reshaped global supply chains.
This guide provides chemical engineers and procurement managers with comprehensive technical specifications, polymorph analysis, verified supplier information, and market intelligence for strategic sourcing decisions.
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Frequently Asked Questions
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Chemical & Physical Properties of Bismuth Oxide
Bismuth Oxide presents as a yellow crystalline powder with remarkable physical characteristics that make it indispensable in advanced materials applications. The compound has a chemical formula of Bi₂O₃ and is registered under CAS Number 1304-76-3, with a molecular weight of 465.96 g/mol.
The material exhibits a high density of approximately 8.9 g/cm³ and melts at 817°C (1503°F), making it suitable for high-temperature processing. While insoluble in water, Bismuth Oxide dissolves readily in acids, a property leveraged in various analytical and synthesis applications.
One of its most distinctive features is an exceptionally high refractive index of approximately 2.45, which makes it valuable for optical glass applications. The dielectric constant ranges from 18 to 38 depending on the specific application and crystal phase, enabling its use in advanced electronics and capacitor technologies.
The standard commercial form exists in a monoclinic crystal structure (α-phase), thermodynamically stable at room temperature. High-purity grades are available from 99.9% (3N) for general industrial use, through 99.99% (4N) for electronics and medical applications, up to 99.999% (5N) for semiconductor manufacturing and research-grade requirements.
These properties make high-purity Bismuth Oxide particularly valuable in optical, electronic, and energy-related applications where lead-based materials are being phased out globally.
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Crystal Forms (Polymorphs)
Bismuth Oxide exists in several polymorphic forms, each with distinct functional properties that serve different industrial applications:
α-Bi₂O₃ (Monoclinic Phase) is the thermodynamically stable form at room temperature and represents the standard commercial grade used in glass and ceramics manufacturing. This is the yellow powder most commonly supplied to industry.
β-Bi₂O₃ (Tetragonal Phase) is a metastable phase exhibiting enhanced ionic conductivity, making it valuable for advanced electronics applications where ion transport is critical.
γ-Bi₂O₃ (Body-Centered Cubic) finds relevance in electronic and catalytic applications, particularly in semiconductor processing where its unique structure provides specific performance advantages.
δ-Bi₂O₃ (Cubic, High-Temperature Phase) is the most remarkable polymorph, exhibiting exceptional oxygen-ion conductivity above 730°C. This phase is critical for Solid Oxide Fuel Cell (SOFC) applications and next-generation energy storage systems, where rapid oxygen-ion transport is essential for performance.
Understanding these polymorphs is essential for materials engineers selecting the appropriate phase for specific applications, particularly in high-performance electronics and next-generation energy technologies.
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Applications of Bismuth Oxide Across Industries
Electronics & Semiconductors
Bismuth Oxide plays a crucial role in modern electronics, serving as dielectric layers in multilayer ceramic capacitors (MLCCs), varistors, and voltage-dependent resistors. Its high dielectric constant makes it ideal for miniaturization efforts in consumer electronics. The material is also fundamental to Solid Oxide Fuel Cell (SOFC) technology, where it functions as an electrolyte material enabling efficient energy conversion.
Glass & Ceramics Manufacturing
The transition to lead-free crystal glass has positioned Bismuth Oxide as the premium replacement for traditional lead oxide in fine glassware. Its high refractive index creates brilliant optical effects in precision lenses and specialty glass products. The material also serves as a key ingredient in ceramic glazes, specialty pigments, and low-temperature sintering additives.
Catalysis & Environmental Applications
In the petrochemical industry, Bismuth Oxide functions as a selective oxidation catalyst, while environmental applications include NOx reduction, CO oxidation, and photocatalytic water treatment systems. These applications contribute to cleaner industrial processes and pollution control.
Pharmaceutical & Medical Technology
The medical sector relies on Bismuth Oxide for its non-toxic nature and radiopaque properties. Applications include dental root canal sealers, radiation shielding materials that replace lead, and contrast agents for medical imaging. The material's physiological inertness makes it ideal for direct human contact applications.
Energy & Green Technology
As the world transitions to renewable energy, Bismuth Oxide serves as an oxygen-ion conductor in fuel cells, battery electrode materials, solar cell components, and systems for green hydrogen production. These applications position it at the forefront of the clean energy revolution.
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Available Purity Grades & Specifications
Industrial applications require precise control over purity and particle characteristics, making grade selection a critical procurement decision.
Standard purity levels begin at 99.9% (3N) for general industrial applications, glass manufacturing, and ceramic production. Electronics, high-performance catalysts, medical devices, and optical applications typically specify 99.99% (4N) purity. For the most demanding applications—semiconductor manufacturing, advanced optics, and research-grade work—99.999% (5N) material is available.
Particle size control ranges from standard −200 mesh (75 μm) powder through micronized grades of 1–10 μm, down to nano-scale Bi₂O₃ at 20–100 nm for advanced applications. Custom particle size distributions can be engineered for specific application requirements.
Phase control and color variations include the standard yellow α-Bi₂O₃ commercial-grade monoclinic phase, phase-pure grades with XRD verification for electronics applications, and stabilized δ-phase variants for high-temperature ionic conductor applications.
These specifications are critical for industries requiring batch-to-batch consistency and regulatory compliance.
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Manufacturing Quality Control & Standards
Leading Bismuth Oxide suppliers employ rigorous quality protocols to ensure consistent performance. The manufacturing process begins with controlled oxidation synthesis using precision temperature and atmosphere control, followed by comprehensive analytical testing.
Batch-level traceability provides full supply chain documentation, while ICP-OES and ICP-MS analysis detects trace metal impurities below 10 ppm. XRD phase verification confirms polymorph identification and purity, complemented by laser diffraction particle size analysis and SEM imaging to characterize morphology.
Reputable suppliers maintain ISO 9001:2015 certification, ensuring quality management system compliance across all operations. These measures guarantee consistent performance for regulated industries including aerospace, defense, medical devices, and semiconductor manufacturing.
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Trusted Bismuth Oxide Suppliers – 2025 Global Directory
Finding a reliable Bismuth Oxide supplier with guaranteed purity, consistent specifications, and stable inventory has become mission-critical in 2025. Export controls and supply chain disruptions have elevated supplier selection from a cost decision to a strategic risk-management priority.
United States: Atlantic Metals & Alloys
Atlantic Metals & Alloys is a premier US-based supplier of high-purity Bismuth Oxide (Bi₂O₃) serving aerospace, defense, semiconductor, and advanced materials sectors. They offer purity grades from 99.9% to 99.999% (3N–5N) with particle sizes ranging from −200 mesh to nano-powder (20 nm).
Their strength lies in providing ASTM-compliant technical documentation for defense and aerospace applications, with full batch traceability for regulated industries. With US-based inventory and expedited shipping capabilities, they support semiconductor fabs, aerospace OEMs, national laboratories, and medical device manufacturers requiring ITAR-compliant sourcing.
Europe & United Kingdom: Kite Metals
Kite Metals is a strategic supplier for UK and EU markets, specializing in REACH-compliant specialty oxides for glass, ceramics, electronics, and lead-free material production. They have secured non-Chinese sourcing alternatives for supply chain resilience, a critical advantage as European manufacturers diversify their supply base.
With European warehousing in Germany and the UK, they provide fast delivery of 99.9%–99.99% purity material with full Certificate of Analysis documentation. Technical support is available in English, German, and French, with custom packaging options for cleanroom and pharmaceutical applications. This makes them ideal for European glass manufacturers, ceramic producers, electronics companies, and pharmaceutical firms navigating REACH regulations.
Brazil & South America: Fortis Metals
Fortis Metals provides localized distribution of Óxido de Bismuto across South America, with headquarters in Brazil and regional warehousing. Their competitive advantage lies in GHS-compliant SDS documentation in Portuguese and deep understanding of Brazilian customs and regulatory requirements.
They offer flexible packaging from 1 kg bags to bulk drums, with 99.9%–99.99% purity grades certified by ICP-MS analysis. Their regional expertise spans automotive, metallurgical, and chemical sectors, with optimized logistics that reduce lead times and import costs. This makes them the go-to partner for South American automotive manufacturers, metallurgical operations, glass producers, and chemical companies requiring local support.
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Global Bismuth Oxide Market Outlook (2025–2030)
The Bismuth Oxide market is experiencing unprecedented transformation. In early 2025, China—controlling approximately 80% of global bismuth supply—introduced export controls on bismuth metal and refined products, triggering price increases exceeding 200% in Western markets and forcing manufacturers to fundamentally rethink their sourcing strategies.
Market Size & Growth Projections
The global market, valued at approximately USD 85 million in 2024, is projected to reach USD 120 million by 2030, representing a compound annual growth rate of 5.8% to 6.2%. The primary growth driver is the worldwide transition to lead-free manufacturing across multiple industries.
Primary Demand Drivers
Lead-free material mandates under RoHS, REACH, and EPA regulations are phasing out lead-based oxides across consumer electronics, automotive, and industrial applications. The expansion of SOFC and fuel cell technology for the hydrogen economy represents another major growth vector, as nations invest in clean energy infrastructure.
Semiconductor manufacturing growth continues driving demand for high-κ dielectric materials, while the medical sector increasingly specifies non-toxic radiopaque materials to replace lead in imaging and dental applications. Premium optical glass innovation for consumer electronics and automotive displays adds further momentum.
Regional Market Dynamics
Europe and the United Kingdom are experiencing 6–7% annual growth driven by REACH compliance mandates and lead-free glass requirements. Premium crystal glass and automotive glass sectors are the primary demand sources.
The United States market, growing at 5–6% annually, is led by semiconductor manufacturing, aerospace and defense applications, and SOFC commercialization for stationary power and backup systems.
Brazil and South America show the strongest regional growth at 7–8% annually, fueled by expanding automotive electronics manufacturing and growing pharmaceutical and medical device production capabilities.
Asia-Pacific markets outside China are experiencing 8–9% annual growth, with India, Japan, and South Korea driving electronics demand while simultaneously accelerating supply chain diversification away from Chinese sources.
Supply Chain Challenges & Strategic Implications
The China export controls represent a long-term structural tightening of bismuth availability, not a temporary disruption. Bismuth metal prices are expected to remain elevated through at least 2027, while secondary sourcing from European and North American refiners expands capacity in response to demand.
Major OEMs are implementing strategic stockpiling, building 12–18 month inventory buffers to insulate production from supply shocks. The procurement recommendation is clear: establish dual-source agreements with geographically diversified suppliers and negotiate long-term contracts to mitigate both price and availability risk.
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Safety, Handling & Regulatory Compliance
Bismuth Oxide is classified as non-hazardous under normal conditions with low acute toxicity under the GHS system. Standard handling precautions include use in well-ventilated areas and avoiding dust inhalation—NIOSH-approved respirators are recommended for prolonged exposure. Standard PPE includes safety glasses, gloves, and lab coats.
Storage requires a cool, dry environment between 15–25°C, with containers kept sealed to prevent moisture absorption. The material should be stored away from strong acids to prevent unwanted reactions.
The material is REACH registered for EU/UK markets, RoHS compliant as a lead-free alternative, TSCA listed under US EPA approval, and globally identified by CAS 1304-76-3.
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Packaging & Logistics
Suppliers typically offer laboratory scale packaging in 100 g, 500 g, and 1 kg bottles for R&D work. Industrial scale requirements are met with 5 kg, 10 kg, and 25 kg bags, while bulk supply options include 50 kg drums, supersacks, and custom palletization for large-volume manufacturing.
Lead times vary by region and specification: US suppliers typically deliver within 3–7 business days domestically, European suppliers within 5–10 business days intra-EU, and South American suppliers within 7–14 business days regionally. Custom grades requiring ultra-high purity or specialized particle size distributions typically require 3–6 weeks for production and quality verification.
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Why Choose a Specialized Bismuth Oxide Supplier
In a volatile raw-materials market, supplier selection criteria must extend far beyond price considerations. Leading suppliers differentiate through guaranteed purity and phase control, ensuring consistent batch-to-batch performance that eliminates costly reformulation and requalification work.
Custom particle engineering capabilities provide application-specific particle size distribution and morphology, while full technical documentation—including Certificates of Analysis, Safety Data Sheets, and regulatory compliance certificates—supports quality systems and regulatory submissions.
Diversified supply chains offering non-Chinese sourcing options mitigate geopolitical and regulatory risk, while industry-specific expertise provides technical support for formulation development and process optimization. Finally, flexible minimum order quantities support both R&D laboratories conducting feasibility studies and production-scale manufacturing operations.
These capabilities are critical for long-term supply security and product quality assurance in an increasingly complex global supply environment.
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Additional Bismuth Oxide FAQs
However, Bi₂O₃ offers a unique combination of high refractive index, favorable dielectric constant, excellent ionic conductivity at elevated temperatures, and lead-free compliance that no single alternative fully replicates. This is why it remains the material of choice for premium glass, advanced electronics, and fuel cell applications.
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Conclusion: Securing Your Bismuth Oxide Supply in 2025 and Beyond
Bismuth Oxide (Bi₂O₃) is a cornerstone material for industries transitioning to sustainable, lead-free manufacturing. From next-generation electronics and solid oxide fuel cells to pharmaceutical innovations and precision optics, high-purity Bismuth Oxide enables critical technological advancement across diverse sectors.
With 2025 export controls and supply chain volatility reshaping the global market, selecting a reliable Bismuth Oxide supplier with guaranteed purity, technical expertise, regulatory compliance, and diversified sourcing has never been more strategically important.
Whether you require ASTM-compliant materials for US aerospace applications, REACH-registered supply for European manufacturing, or localized logistics in South America, partnering with established suppliers like Atlantic Metals & Alloys, Kite Metals, and Fortis Metals ensures supply continuity and product quality.
At Fortis Metals, we specialize in high-purity Bismuth Oxide and specialty chemicals, supporting global manufacturers with technical guidance, flexible packaging, and reliable supply. Contact us today to discuss your Bismuth Oxide requirements and secure your strategic supply chain.
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