Double clear 5+9A+5mm tempered glass and thermal break aluminum frame are consisted for unbreakable window.
When buying this kind of door window, should check material above all.
Generally speaking, the aluminum alloy that is used at high grade analok aluminum frame window, thickness, intensity and oxide film all accord with national concerned standard. The thickness of the oxide film should be up to 10 microns. If it exceeds national standards, then of course even products with European standards are the best choice.
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