Tungsten(VI) Oxide, also known as tungsten trioxide or tungstic anhydride, is a chemical compound containing oxygen and the transition metal tungsten. It is soluble in hot alkali solutions. Insoluble in water and acids. Slightly soluble in hydrofluoric acid.
| Tungsten Trioxide | |
| Synonym: | Tungstic anhydride,Tungsten(VI) oxide,Tungstic oxide |
| CAS No. | 1314-35-8 |
| Chemical formula | WO3 |
| Molar mass | 231.84 g/mol |
| Appearance | Canary yellow powder |
| Density | 7.16 g/cm3 |
| Melting point | 1,473 °C (2,683 °F; 1,746 K) |
| Boiling point | 1,700 °C (3,090 °F; 1,970 K) approximation |
| Solubility in water | insoluble |
| Solubility | slightly soluble in HF |
| Magnetic susceptibility (χ) | −15.8·10−6 cm3/mol |
High Grade Tungsten Trioxide Specification
| Symbol | Grade | Abbreviation | Formula | F.s.s.s(µm) | Apparent Density(g/cm³) | Oxygen Content | Main content (%) |
| UMYT9997 | Tungsten Trioxide | Yellow Tungsten | WO3 | 10.00～25.00 | 1.00～3.00 | - | WO3.0≥99.97 |
| UMBT9997 | Blue Tungsten Oxide | Blue Tungsten | WO3-X | 10.00～22.00 | 1.00～3.00 | 2.92～2.98 | WO2.9≥99.97 |
Note:Blue Tungsten mainly mixed ; Packing:In iron drums with double inner plastic bags of 200kgs net each.
What is Tungsten Trioxide used for?
Tungsten Trioxide is used for many purposes in industry, such as tungsten and tungstate manufacturing which are used as X-ray screens and for fire proofing fabrics. It is used as a ceramic pigment. Nanowires of Tungsten (VI) oxide are capable of absorbing a higher percentage of the sun radiation since it absorbs blue light.
In everyday life,Tungsten Trioxide is frequently used in manufacturing tungstates for x-ray screen phosphors, for fireproofing fabrics and in gas sensors. Due to its rich yellow color, WO3 is also used as a pigment in ceramics and paints.
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