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A layer of film (of 100 μm thickness or greater) can prevent the ejection of spall when a projectile impacts on its surface, which otherwise creates small dagger-like shards of glass that can cause injury. Switchable films can be switched from opaque to clear by a safe voltage under 36V AC.
The remaining frequencies (or wavelengths) are free to be reflected or transmitted. This is how colored glass is produced. Most liquids and aqueous solutions are highly transparent. For example, water, cooking oil, rubbing alcohol, air, and natural gas are all clear.
Doped metal oxides for use as transparent conducting layers in photovoltaic devices are typically grown on a glass substrate. This glass substrate, apart from providing a support that the oxide can grow on, has the additional benefit of blocking most infrared wavelengths greater than 2 μm for most silicates, and converting it to heat in the glass layer.
A film is attached to the window frame to trap a pocket of air between the glass and the film, creating a double-glazed system with an insulating gap of still air. Thermal conductivity of still air is 0.024 W/(m.K) and much lower than that of glass (0.96 W/(m.K)). [1]
Some types of smart films can be applied to existing glass windows using either a self-adhesive smart film or special glue. [10] Spray-on methods for applying clear coatings to block heat and conduct electricity are also under development. [11]
#17 Frosted Glass Window Film: Let The Light In, Keep The Nosy Neighbors Out! Review: "The quality Of this window vinyl is thick and sturdy. Very easy to apply as you can see in the image.