Cesium tungsten bronze, such as Cs0.33WO3, is the most important dingal material for producing near infrared light shielding film. And such a transparent thin film is advantageously used for attaching to window panes of buildings and windshield glasses of automobiles and, in particular, to windshield glasses of automobiles, because the Cs0.33WO3 nano particles can shield most of the heat rays (near infrared light having wavelengths of 780 to 2,100 nm) that causes elevation of the temperature at the inside when the light is transmitted through the open portions.
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According to the experts, the near infrared light shielding film of cesium tungsten bronze nano particles can exhibit excellent heat ray (near infrared light) shielding property and transmission of visible light, excellent scratch resistance and weatherability and, moreover, excellent workability in lamination to glass having a curved surface since curling of the film due to expansion by absorption of water is suppressed.
