... and clean 2.heat insulation 3.watertightness, windtightness,airtightness aluminum windows:1.frame material: upvc\pvc\palstic\aluminum\aluminum alloy.etc2 ... )5.sorts:sliding window,casement window,hung window\title and turn window.etccolor:white, red, green, grey, gold and so onfeatures1 ... )THERMAL BREAKK<1.5NOISE INSULATERw≥45LIGHTING PERFORMANCETr≥0.60 aluminum windows