Tungsten Trioxide, Tungsten Oxide, Dioxotungsten, Tungstic Anhydride, 1314‑35‑8

Tungsten Trioxide, Tungsten Oxide, Dioxotungsten, Tungstic Anhydride, 1314‑35‑8

Tungsten trioxide (CAS 1314‑35‑8):

📑 Quick Facts

• CAS No: 1314‑35‑8

• Chemical Formula: WO₃

• Molecular Weight: 231.84 g/mol

• Density: ~7.16 g/cm³

• Melting Point: ~1473 °C

• Packaging Types: 25 kg bags, drums, IBCs

• HS Code: 2825.90 (metal oxides, tungsten compounds)

⚙️ Technical Properties

• Appearance: Yellow crystalline powder (can appear greenish depending on hydration state)

• Solubility: Insoluble in water, soluble in alkalis and acids

• Crystal Structure: Monoclinic (stable at room temperature), polymorphic transitions at high temperature

• Purity Grades: 99.0–99.99% (industrial vs. high‑purity grades)

🏭 Applications

• Metallurgy: Intermediate for tungsten metal and tungsten carbide production

• Pigments: Yellow coloration in ceramics and glass

• Electrochromic Devices: Smart windows, displays (WO₃ thin films change color under voltage)

• Catalysis: Used in petrochemical and environmental catalysts

• Electronics: Gas sensors, optical coatings, photocatalysis

🔬 Production Methods / Sources

• Obtained by calcination of ammonium paratungstate (APT)

• Thermal decomposition of tungstic acid or tungsten salts

• High‑purity WO₃ produced via controlled crystallization and purification

📊 Sector Suitability Table

🧾 Other Names

• Tungsten(VI) oxide

• Tungstic anhydride

• Dioxotungsten(VI)

• WO₃

🛡️ Safety & MSDS Summary

• GHS Pictograms: ⚠️ Irritant, 🌍 Environmentally hazardous

• Storage: Dry, sealed packaging, avoid moisture

• PPE: Gloves, goggles, dust mask/respirator

• Waste: Collect as heavy metal oxide waste, dispose via licensed facilities

🌍 Market & Commercial Information

• Purity Grades: 99%, 99.9%, 99.99%

• Packaging: 25 kg bags, 50 kg drums, 1000 kg IBCs

• Producer Regions: China, Austria, USA (major tungsten refiners)

• Trade Names: Tungstic oxide, WO₃

🧪 Quality & Analytical Data

• Tests: ICP‑OES (trace metals), XRD (phase), BET (surface area), particle size distribution

• Forms: Powder, nanopowder, thin‑film precursors

🌱 Environmental & Sustainability Aspects

• Waste Management: Classified as heavy metal oxide; requires controlled disposal

• Recycling: Recoverable from tungsten scrap and spent catalysts

• Carbon Footprint: Moderate; depends on mining and refining of tungsten ores