Make Glass Reflective or Transparent with this Special Film

February 20, 2013, By Sanjeev Ramachandran

Window glass allows visible light to enter buildings, but it reduces thermal insulation between the interior and exterior because it allows transmission of heat as well as visible light.  The use of double-insulating glass and heat-reflecting glass, which possesses a high degree of thermal insulation, has recently become widespread.

But glass that can regulate the amount of light entering a room from the outside would improve energy saving.

This is where the scientists from Japan’s National Institute of Advanced Industrial Science and Technology (AIST) have made a giant stride. They have come up with a film that can be stuck on to any glass, and with the click of a button, the glass can be made reflective or transparent.


This latest all-solid-state switchable mirror film operates as an electrochromic system using electricity.  As it uses only electricity and does not require any special control system, the initial costs for the introduction of the switchable mirror film are low.

The film is made entirely of solid materials, and thus offers easy handling. It can also be used for privacy glass or security equipment needs, as, in its reflective state, it prevents the inside of a building or vehicle from being seen from the outside.

There is a technique for laminating these switchable layers on a film and a 100 micrometer thick electrochromic switchable mirror film has been produced.

This new product is more easily produced, has a better economic efficiency, is more easily recyclable, and is more easy handling than existing switchable mirror films formed on glass.

As the switchable mirror film can be stuck on already built window glass, the range of applications of this film has expanded dramatically.

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