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Tungsten trioxide is an inorganic substance with the chemical formula of WO3, it is yellow powder, insoluble in water, soluble in alkali, slightly soluble in acid. Used for making high melting point alloys and hard alloys, tungsten wires, and fire-resistant materials. It can be obtained by co melting tungsten ore with soda ash and adding acid.

Tungsten trioxide is mainly used for calcination and reduction to produce tungsten powder and tungsten carbide powder, and then to produce cemented carbide products, such as the manufacturing of tools and molds. It can also be used to manufacture pure tungsten products, tungsten bars, tungsten wires, and tungsten electrodes; and the use of shielding materials for counterweights and radiation. There are also a small amount of colorants used as yellow Ceramic in industrial production. In the shipbuilding industry, tungsten oxide is used as an important anti-corrosion paint and coating material.

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