No Widgets found in the Sidebar

If you are looking for high-quality products, please feel free to contact us and send an inquiry, email:

About Tungsten Oxide WO3 Powder:
Tungsten trioxide is an inorganic substance with the chemical formula WO3, yellow powder. It is obtained by adding acid after the fusion of ore and soda ash.
Tungsten trioxide is a light yellow orthorhombic crystalline powder. The color changes from lighter to darker when heated. The specific gravity is 7.16 g/cm3, the melting point is 1473°C, and the boiling point is 1750°C. It sublimates significantly at 850°C and turns green when melted. It is stable in the air, insoluble in water and inorganic acids except for hydrofluoric acid, and can be slowly dissolved in ammonia water and concentrated sodium hydroxide solution.
Tungsten(VI) oxide, also known as tungsten trioxide or tungstic anhydride, WO3, is a chemical compound containing oxygen and the transition metal tungsten. It is obtained as an intermediate in the recovery of tungsten from its minerals.  Tungsten ores are treated with alkalis to produce WO3. Further reaction with carbon or hydrogen gas reduces tungsten trioxide to pure metal.
Tungsten(VI) oxide occurs naturally in the form of hydrates, which include minerals: tungstite WO3·H2O, meymacite WO3·2H2O and hydrotungstite (of the same composition as meymacite, however sometimes written as H2WO4). These minerals are rare to very rare secondary tungsten minerals.
The crystal structure of tungsten trioxide is temperature-dependent. It is tetragonal at temperatures above 740 °C, orthorhombic from 330 to 740 °C, monoclinic from 17 to 330 °C, triclinic from -50 to 17 °C, and monoclinic again at temperatures below -50 °C. The most common structure of WO3 is monoclinic with space group P21/n.
Tungsten trioxide is a strong oxidizing agent: it reacts with rare-earth elements, iron, copper, aluminum, manganese, zinc, chromium, molybdenum, carbon, hydrogen and silver, being reduced to a pure tungsten metal. Reaction with gold and platinum reduces it to dioxide. Feel free to send an inquiry to get the latest price if you would like to buy Tungsten Oxide WO3 Powder in bulk.

Performance of Tungsten Oxide WO3 Powder:

Tungsten trioxide is a light yellow orthorhombic crystal powder. The color changes from light to dark when heated. The specific gravity is 7.16 g/cubic centimeter, the melting point is 1473°C, the boiling point is 1750°C, it sublimates remarkably at 850°C, and turns green when melted. Stable in air, insoluble in water and inorganic acids other than hydrofluoric acid, and slowly soluble in ammonia water and concentrated hot sodium hydroxide solution.

Technical Parameter of Tungsten Oxide WO3 Powder:

WO3 Certificate of Analysis—ppm












How is Tungsten Oxide WO3 Powder produced?
Tungsten trioxide can be prepared in several different ways. CaWO4, or scheelite, is allowed to react with HCl to produce tungstic acid, which decomposes to WO3 and water at high temperatures.
CaWO4 + 2 HCl → CaCl2 + H2WO4
H2WO4 → H2O + WO3
Another common way to synthesize WO3 is by calcination of ammonium para tungstate (APT) under oxidizing conditions:
(NH4)10[H2W12O42] • 4H2O → 12 WO3 + 10 NH3 + 10 H2O
Applications of Tungsten Oxide WO3 Powder:
Tungsten trioxide has many uses in daily life. It is often used in industry to manufacture X-ray phosphors, fireproof fabrics and gas sensors. Due to its rich yellow color, WO3 can also be used as a pigment for ceramics and paints.
1.Tungsten trioxide is mainly used for calcining reduction to produce tungsten powder and tungsten carbide powder and then used for the production of cemented carbide products, such as the manufacture of tools and molds.
2.Tungsten trioxide can also be used to manufacture pure tungsten products, tungsten bars, tungsten wires, tungsten electrodes;
3.In industrial production, a small amount of tungsten trioxide is also used as a colorant for yellow ceramics.
4.In the shipbuilding industry, tungsten oxide of tungsten is used as an important anticorrosive paint and coating material.
5.In recent years, tungsten trioxide has been used to produce electrochromic windows or smart windows. These windows are electrically switchable glass, and the light transmission properties can be changed by applying a voltage. This allows users to tint their windows, thereby changing the amount of heat or light passing through.
6.X-ray screen and fireproof textile and the colorant and analysis reagent of chinaware, etc.
7.Tungsten trioxide can be used as a weight and radiation shielding material.
8.WO3  also has been under extensive research because of its importance for its electro-optical, electrochromic, ferroelectric and catalytic, etc.
9.Radiation shielding material and the producing metal tungsten material.

Storage Condition of Tungsten Oxide WO3 Powder:
Tungsten Oxide WO3 Powder should be stored in dry, cool and sealing of the environment, can not be exposure to air, in addition, should avoid the heavy pressure, according to ordinary goods transportation.

Packing & Shipping of Tungsten Oxide WO3 Powder:
It is packed in double plastic bags inside, which can be filled with argon in vacuum; it can be vacuumed and filled with argon for protection..
Tungsten Oxide WO3 Powder packing: vacuum packing, 100g, 500g or 1kg/bag, 25kg/barrel, or as your request.
Tungsten Oxide WO3 Powder shipping: could be shipped out by sea , by air, by express as soon as possible once payment receipt.
Tungsten Oxide WO3 Powder CAS 1314-35-8插图

Tungsten Oxide WO3 Powder Properties

Other NamesTungsten trioxide, Tungstic anhydride, Tungsten(VI) oxide, Tungstic, oxide
CAS No.1314-35-8
Compound FormulaWO3
Molecular Weight231.84 g/mol
Appearanceyellow, purple, blue powder
Melting Point1,473 °C
Solubility in waterInsoluble
Density7.16 g/cm3
Particle Size70nm
Boling point1700 °C 
Specific HeatN/A
Thermal ConductivityN/A
Thermal ExpansionN/A
Young’s ModulusN/A
Exact Mass231.936 g/mol
Monoisotopic Mass231.935644 Da

Tungsten Oxide WO3 Powder Health & Safety Information

Safety WarningN/A
Hazard StatementsN/A
Flashing pointNot applicable
Hazard CodesN/A
Risk CodesN/A
Safety StatementsN/A
RTECS NumberYO7760000
Transport InformationNONH for all modes of transport
WGK GermanyN/A
Inquiry us

By admin