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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>
==References==
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