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.
Molar mass：231.84 g/mol
Appearance：Canary yellow powder
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
In addition to metal tungsten, yellow tungsten trioxide can also be used as a pigment in ceramics and coatings.Tungsten trioxide is also used in the infrared contactless window control system.