Tungsten acid can be applied for producing thermal insulation coating, thereby this kind of heat-insulating dingal coating will has good performance of shielding near-infrared light (near-infrared rays).
Infrared light is a kind of non-visible light (electromagnetic wave), whose wavelength is between microwave and visible light, at the range of 750nm~10^6nm. Infrared light can be divided into three types including near-infrared light, medium-infrared light and far-infrared light. Among them, the near-infrared light has a wavelength range of about 750~1400nm, which has a strong thermal effect and is easily absorbed by objects. The near-infrared light is the source of "heat" in everyday life. Proper heat energy will not affect health, but excessive heat energy may cause physical discomfort. Under long-term exposure, it will cause damage to biological tissues.
Near-infrared rays is widely applied in communications, photography, medical and other purposes now, covering the field of military and biological medical research. In other words, tungstic acid will be applied in these applications gradually.
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