1, depending on whether the materials are of high quality. Good aluminum alloy doors and windows are all primary aluminum, and the thickness, strength and oxide film meet the relevant national standards. For example, the wall thickness is above 1.4mm, the tensile strength reaches 157 Newton per square millimeter, the yield strength reaches 108 Newton per square millimeter, and the oxide film thickness reaches 10 micron. If you use recycled aluminum, you can't reach the top.

2. See if the workmanship is fine. Good aluminum alloy doors and windows have fine workmanship, smooth tangent, consistent angle, shiny and textured surface, natural and even spraying color, free opening and closing, no air leakage, rain leakage and glass cracking, and can resist strong winds and external forces to ensure that doors and windows are not damaged.

In short, the above two points can not be ignored when buying aluminum alloy doors and windows, so as to buy high-quality aluminum alloy doors and windows.