Metallurgical, High Purity & Electronic Grade Blue Tungsten Oxide (BTO) CAS 39318-18-8 Tungsten Powder Precursor, Catalyst & Electrochromic Functional

Blue Tungsten Oxide (Abbr: BTO, formula WO₂.₉ / W₁₈O₄₉, CAS: 39318-18-8, EINECS: 235-215-3, HS Code: 2825901900) is a dark blue to blue-black fine powder, a non-stoichiometric tungsten oxide with abundant oxygen vacancies. We supply industrial and high-purity grades with purity up to 99.95%, complying with international powder metallurgy and functional material standards. It features excellent reducibility, uniform particle size, stable crystal structure and special optical/electrochemical properties. Widely used as core raw material for tungsten powder production, cemented carbide manufacturing, and functional materials in ceramic, electronic and catalytic industries.Blue Tungsten Oxide (Abbr: BTO, formula WO₂.₉ / W₁₈O₄₉, CAS: 39318-18-8, EINECS: 235-215-3, HS Code: 2825901900) is a dark blue to blue-black fine powder, a non-stoichiometric tungsten oxide with abundant oxygen vacancies. We supply industrial and high-purity grades with purity up to 99.95%, complying with international powder metallurgy and functional material standards. It features excellent reducibility, uniform particle size, stable crystal structure and special optical/electrochemical properties. Widely used as core raw material for tungsten powder production, cemented carbide manufacturing, and functional materials in ceramic, electronic and catalytic industries.

Applications
Powder Metallurgy & Cemented Carbide (Core Application)
Primary raw material for producing pure tungsten powder, doped tungsten powder and tungsten carbide powder. It is further processed into tungsten rods, tungsten wires, cemented carbide tools, dies and wear-resistant parts. Its excellent reducibility ensures uniform grain size and stable performance of final tungsten products, being the most widely used intermediate in the tungsten processing industry.
Ceramic & Glass Industry
Used as high-temperature blue colorant for architectural ceramics, sanitary ware and craft ceramics. It also serves as functional additive for smart glass and heat-insulating coatings, endowing glass with electrochromic and near-infrared shielding properties, and is applied in energy-saving architectural glass and automotive window films.
Petrochemical & Catalytic Industry
Applied as desulfurization catalyst and photocatalyst in petrochemical refining and wastewater treatment. Its oxygen vacancy structure provides abundant active sites, improves catalytic reaction efficiency, and is also used as catalyst carrier for organic synthesis and environmental purification processes.
Electronic & Functional Material Field
Used to prepare gas-sensitive sensors for detecting toxic gases such as NO₂ and NH₃, with high sensitivity and low detection limit. It is also a core material for electrochromic devices, semiconductor thin films and ultraviolet shielding materials, widely used in electronic components and new energy fields.
Pigment & Coating Industry
High-performance inorganic blue pigment for high-temperature resistant coatings, anti-corrosion coatings and art coatings. It has excellent weather resistance, light fastness and high temperature stability, no fading under long-term outdoor exposure, suitable for harsh environment coating systems.
Other Industrial Applications
Used as functional additive for fire-resistant fabrics, X-ray shielding materials and high-temperature lubricants. It also serves as raw material for preparing nano tungsten materials and special tungsten-based functional materials in aerospace and national defense industries.

Product Advantages
✅ High purity & low impurities: 99.95% minimum purity with ultra-low metal impurity content, ensures stable performance of downstream products
✅ Excellent reducibility: Unique oxygen vacancy structure, fast and uniform reduction reaction, ideal for producing high-quality tungsten powder
✅ Controllable particle size: Uniform particle size distribution, customizable specifications to match different production processes
✅ Multi-functional properties: Integrates catalytic, electrochromic, gas-sensitive and optical properties, suitable for diversified high-end applications
✅ Stable batch quality: Consistent crystal phase and composition between batches, reliable for large-scale continuous industrial production
✅ Mature supply chain: Stable raw material base and mature production process, guarantee reliable delivery and competitive price

Packaging & Storage
Standard packaging: 25kg iron drums or woven bags with inner PE liner; 500kg / 1000kg FIBC bulk bags for large orders. Store in a cool, dry and well-ventilated warehouse at room temperature. Keep containers tightly sealed, strictly protected from moisture, and avoid contact with acids, alkalis and reducing agents. Shelf life is 24 months under proper storage conditions.
Safety Information
Classified as non-hazardous goods for regular transportation. Avoid inhalation of dust and prolonged skin contact. Wear dust mask and protective gloves during handling. In case of contact with eyes or skin, rinse immediately with plenty of clean water. Complete MSDS and quality inspection certificates are available upon request.

With 15 years of experience in chemical foreign trade, we offer the following core strengths to support your procurement needs:
1.A 70,000 ㎡ warehouse (20,000 MT capacity) with moisture-proof and temperature-controlled systems, enabling efficient fulfillment of large-volume orders.
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3.Transparent lead time for hazardous chemicals: 45–60 days, with clear delivery schedules.
4.Certified with a Hazardous Chemical Business License and ISO certification, ensuring smooth customs clearance.
5.6 packaging options with customizable logos to minimize product loss during transportation.
6.Over 400 chemical SKUs available for one-stop procurement, helping you reduce sourcing costs.
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