High-Performance Window Films

The new generation of high-performance films relies on properties of reflectivity and emissivity rather than absorption. Spectrally selective coatings reject heat gain by blocking the infrared spectrum responsible for almost half the heat contained in sunlight, while blocking much less of the visible light. These film properties are achieved with microthin layers of various metals applied to polyester films; performance properties are manipulated by using different types and quantities of metals. The low-emissivity technology used in contemporary window films is the same as that used in low-emissivity windows; see

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