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==Thermoplastics used==
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).
==Production==
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* '''Bottom layer:'''..Glass
Within this last specification mentioned above, the 2 thermoplastic layers together with the LED Interlayer<ref>http://www.ledglass.ch/ledglass</ref> will reach a total thickness of about 2mm. The usually very economical PVB is the most used [[Laminated_glass|lamination interlayer]]. Its lamination is based on a nip roller pre-heating step folowed by an autoclaving process with a final stage at 135 °C and 14 athmospheres. However, polyester has a better adhesion to [[Thermoplastics_polyurethanes_(TPU)|TPU]]<ref>http://en.wikipedia.org/wiki/Solutia</ref> or to [[Ethylene-vinyl_acetate|EVA (also to EVASafe)]], which are often laminated using simple vacuum tables. The 2 thermoplastic interlayers have a high adhesion to stone, wood, metals, foam, fabric and many Polymers. So they may be used to produce different products outside the typical glass business.
==References==
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