In the production of warm fiber, the use of ammonium metatungstate as an additive can make it far superior to the thermal fiber produced by other additives, such as: good thermal insulation and non-toxicity.

The nano yellow tungsten oxide warm clothing is a garment with excellent heat storage and heat preservation effect ,which is synthesized by scientists with and the development of science and technology.

Yellow tungsten oxide warm fabric not only has the advantages common to general warm fabrics, such as good air permeability, resilience, laminate, non-fading and warmth, also it has anti-radiation,wear-resistant, anti-static, anti-corrosion, and It is good for the body. These advantages are mainly determined by the nature of the nano yellow tungsten oxide. Among them, the physical properties of nano particle size yellow tungsten oxide: density is 7.16g/cm3; melting point is 1473°C; boiling point is 1700°C; good stability, high hardness, wear resistance, electrical conductivity and thermal conductivity; insoluble in water and Other organic acids other than hydrofluoricacid acid (HF). Warm fabrics are more comfortable by imitation of warm fabrics with good physical properties.

Warm fiber can be prepared by using nano yellow tungsten oxide (WO3) as raw material, because nano grain size yellow tungsten oxide has the ability to absorb solar energy, and can convert light energy into far infrared ray, thereby improving its heat storage and warming effect and obtaining energy storage performance. Rays returning to the human body not only can play a role in heat preservation, but also deep into the subcutaneous layer, which can improve metabolism and promote blood circulation, so the fiber is good for your health.