casement opening window:easy to open and install ,occupy litter place ,with rigidity structure,heat -resisting ,soundproof , 1.Glass thickness:5mm+9A+5mm insulating ,5mm+6A+5mm insulating ,5mm+9A+5MM+9A+5mmdoule insulating function glass ,6mm single glass.2.Surface treatment:Anodic oxidation ,electrophoretic painting,powder coating,fluoro-carbon painting.3:High security4:Glass types:tempered ...