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Heat-mirror glass is a type of glass with a transparent coating that allows sunlight (short-wavelength radiation) to enter a space but reflects heat (longer-wavelength radiation) generated within that space back inside. This technology was introduced in 1984 and, when used in double-glazed windows, offers insulation comparable to that of a wall.1

The development of glass in construction saw significant advancements during the second industrial age. Techniques for producing clear plate glass were perfected, and by the 1940s, prefabricated double-glazed panels became available, utilizing the insulating principle of trapped air between glass layers. In the 1960s, reflective glass with metallic coatings was introduced to reduce solar gain. Heat-mirror glass further enhanced energy efficiency by managing radiant heat transfer.1

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