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:
* Top Layer:...Standard glass
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==Thermoplastics==
The transparent thermoplastic material will usually show a quite similar light refractive index compared to glass. Typical thermoplastics used in the glass industry to produce these type of security glazings will consist of Thermoplastic Polyurethane<ref>Bayer Inc., US2006135728 [http://v3.espacenet.com/publicationDetails/biblio?CC=JP&NR=2006169536A&KC=A&FT=D&date=20060629&DB=EPODOC&locale=en_EP "Thermoplastic polyurethane (TPU) having good adhesion to glass "]</ref> (TPU), Ethyl-Vinyl-Acetate<ref>Bridgestone Inc., DE4308885(B4) [http://v3.espacenet.com/publicationDetails/biblio?CC=DE&NR=4308885A1&KC=A1&FT=D&date=19930923&DB=EPODOC&locale=en_EP "Laminated glass with thermoset film of (meth)acrylate or hydrocarbon resin – containing EVA and organic peroxide for high impact strength, penetration resistance and transparency"]</ref> (EVA) or Poly-Vinyl-Butyral<ref>Solutia Inc., WO03057478 [http://v3.espacenet.com/publicationDetails/biblio?DB=EPODOC&adjacent=true&locale=en_EP&FT=D&date=20080320&CC=IL&NR=162701A&KC=A "GLASS LAMINATION PROCESS AND APPARATUS"]</ref> (PVB).
