Tungsten oxide (WO3) may be applied for producing thermal insulation paper. Tungsten oxide is a new material discovered in recent years, which can be used as transparent heat insulation coating.
WO3 nanopowder has the best near infrared absorptive capacity. It not only has strong absorption characteristics in the near-infrared region, and has strong transmission characteristics in the visible region, but also in the ultraviolet region it has a strong shielding property. It also has broad application prospects in the field of architectural glass insulation multi-industry, automotive films, sun heat, plastic greenhouses, and so on.
Near-infrared shielding means that solar radiation incident on the material is absorbed, transmitted, and reflected. Among them, absorption ratio is α, reflection ratio is β, and transmittance is γ. Then, α+β+γ=1. When α, β decrease, then γ will increase, so, suitable material such as SnO2, ZnO, TiO2, Fe2O3, Cr2O3, Mn2O3, ZnS, CoO, NiO and other compounds should be chosen to block specific wavelength. So, the absorption and transmission of visible light of this type of thermal insulation paper are reduced, and the reflection of near-infrared light is enhanced, to achieve the effect of NIR-shielding and heat insulation.
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http://www.tungsten-powder.com/tungsten-oxide.html
