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The LED–glass composite material may consist of using transparent metallized glass<ref>Hahn, T., EP0900971A1 [http://v3.espacenet.com/publicationDetails/biblio?DB=EPODOC&adjacent=true&locale=en_EP&FT=D&date=19990310&CC=EP&NR=0900971A1&KC=A1 "Lighting device containing LEDs on glass"]</ref> as electricity conductor. In this case the final composite specification will be:
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==Thermoplastics==
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Because most of the glass companies are not skilled to mount LEDs (light emitting diodes) onto metallized glass, it makes sense to locate the LEDs on a separate transparent conductive polymeric interlayer, which may be laminated by any glass lamination unit. In other words, the remaining process for glass lamination units will consist of laminating together standard glass using 2 layers of thermoplastic interlayers to sandwich ready to use LED-embedded films. This process will be quite similar for 3D curved LED–glass<ref>[http://www.ledglass.ch Video with 3D curved laminated LED–glass]</ref>. The final specification will be:
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Within this last specification mentioned above, the 2 thermoplastic layers together with the LED interlayer will reach a total thickness of about 2 mm. The usually very economical PVB is the most used [[Laminated glass|lamination interlayer]]. Its lamination is based on a nip roller pre-heating step followed by an autoclaving process with a final stage ideally below 125 °C and 14 athmospheres. However, polyester has a better adhesion to [[Thermoplastics polyurethanes (TPU)|TPU]], to [[Ethylene-vinyl acetate|EVA]] or to EVASafe[http://www.bridgestone.com/products/diversified/evasafe/index.html EVASAfe], which are often laminated using simple vacuum tables. EVASafe contain some hygroscopic crosslinking agent, which will allow its partial crosslinking to active sites of the substrates. TPU may be used up to 125 °C. EVASafe should be used below 110 °C. These transparent conductive thermoplastics may also be used for [[Transparent_heating_film|transparent heating]] of glass laminates.
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