Leybold Optics: heat treatable low emissivity coatings for architectural glass applications

2014-08-20 | Coatings

Heat treatable low emissivity layer stacks available in the market are often proprietary and involve metallic, oxidic and nitridic layers. In this article, Leybold Optics describes an alternative set of layer stacks which comprises only metallic and oxidic layers and which can be obtained with the company’s coaters.

Leybold Optics: heat treatable low emissivity coatings for architectural glass applications
Introduction
Low emissivity coating (low-E) is a standard application in architectural glass industry to reduce heat exchange of buildings through window glass. It reduces heat loss in winter and heating-up in summer whereby the energy costs for heaters and air conditioning facilities are reduced significantly.
Heat treatable low emissivity coatings are designed for efficient production of thermally toughened safety glass. Due to the fact that tempered glass cannot be cut, a low-E coating that withstands the tempering process for safety glass manufacturing is coated on standardized large area glass panes. As it can be produced with high through-put and high coating yield, it is a cost efficient way to provide low-E coatings on tempered architectural glass.
Leybold Optics’ alternative layer stacks, which contain only metallic and oxidic layers, consist of a silver layer contained in an appropriate arrangement of different blocking and dielectric layers with a high reflectance in infrared spectra range and high transmittance for visual light. It withstands heat treatment requirements for safety glass production. The described layer stack provides a transmittance of more than 80 per cent at a sheet resistance of less than 3Ω/□. By splitting the silver into two or three different layers, divided by dielectric films, sheet resistance  can be reduced to 1 Ω/□ at a transmittance of 76 per cent. Compared to other temperable layer stacks, the solution described here consists of metals an...


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Article taken from Glass-Technology International bi-monthly magazine (6 issues per year)
Year: 2014 number: 4
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