The main functions laminate glass are to protect the radiation energy inside from emitting, while to allow the radiation of sun''s energy inside as much as possible, so the glass can keep the temperature inside and retrench central heating.The hollow glass is widely used in the skyscrapers and dwelling houses in usa, japan and europe etc. Technical data:Mm Maximum specification:2500mmx1800mm Minimum specification:540mmx200mm Thickness of aluminum framework:4a 6a 9a 12a 15a Thickness of glass:4-12mm