Tungsten trioxide is also known as yellow tungsten oxide, chemical formula WO₃, its density is 7.16 g / cm³; melting point is 1473 °C; boiling point is about 1700 °C.

As a new type of energy material, the thermoelectric material has a lower environmental pollution than the traditional petrochemical materials. It is a significant environment friendly material.

The nanoscale cesium tungstate powder is a kind of inorganic nano powder which has the best absorption ability to the near infrared. However, it is well known that the price of nano-sized cesium tungstate is more expensive, mainly because the preparation method is not yet mature, and it is difficult to make large-scale production. 

Cesium tungstate is an inorganic transparent thermal insulation material with strong near-infrared absorption and radiation properties. Since its publication, it has been continuously pursued by high-end glass manufacturers and coatings providers.

Violet tungsten oxide, abbreviated as VTO, is named after its purple appearance. It is the best raw material for the production of ultrafine or nanometer tungsten powder. It is produced in the process of precise control of temperature reduction and production of ammonium parotungstate.

Violet tungsten oxide, the chemical name is WO_2.72, purple or blue purple fine crystal powder, purple tungsten oxide has a unique fine needle like structure. Compared with blue tungsten and tungsten, violet tungsten has a special surface and the highest chemical activity. Therefore, violet tungsten is the most suitable for the production of ultrafine tungsten powder.

Tungsten hexafluoride is tungsten and fluorine to form a two element compound WF₆. In the fluorides of tungsten, WF₆ is the only stable and industrialized product.

Smelting is the main method of tungsten metal refining, including arc melting, electron beam melting and regional melting. Electron beam melting and zone melting are mainly used to produce tungsten ingots or single crystals whose purity is more than 99.999.