How to look at aluminum alloy doors and windows? I bought it here at Maoming Gaoshan Building Materials Market. Please give me some advice. Recommend several cost-effective brands.

According to your question, the global aluminum network can be summarized as follows: the quality of aluminum alloy doors and windows can be roughly judged from the selection of raw materials (aluminum profiles), the quality of aluminum surface treatment and internal processing, and the price of aluminum alloy doors and windows.

A look at the material, the thickness, strength and oxide film of high-quality aluminum alloy doors and windows should meet the relevant national standards. The wall thickness should be above 65438 0.2 mm, the tensile strength should reach 65438 057 Newton per square millimeter, the yield strength should reach 65438 008 Newton per square millimeter, and the oxide film thickness should reach 65438 00 micron. If you can't meet the above standards, it is inferior aluminum alloy doors and windows and can't be used.

Second, processing, high-quality aluminum alloy doors and windows, fine processing, exquisite installation, good sealing performance and convenient opening and closing. Inferior aluminum alloy doors and windows blindly adopt aluminum profile series and specifications, and the processing is shoddy. Saw instead of milling, not installed as required. Poor sealing performance, uncomfortable switch, not only air leakage and rain leakage, but also glass cracking. When encountering strong wind and external force, it is easy to scratch or touch the push-pull part or glass, damaging things and hurting people.

Third, look at the price. In general, high-quality aluminum alloy doors and windows are about 30% higher than inferior aluminum alloy doors and windows because of their high production cost. Some aluminum alloy doors and windows made of aluminum profiles with a wall thickness of only 0.6-0.8 mm are far below the relevant national standards in tensile strength and yield strength, so they are unsafe to use.

In addition, there are many self-employed people who process aluminum alloy doors and windows at present, and they don't understand the structural characteristics and performance of aluminum alloy doors and windows. In order to reduce the cost, cutting corners and shoddy products have great hidden dangers and are generally not suitable for use. It is best to choose the products of regular aluminum alloy doors and windows manufacturers. It should be noted that the current national standard profile thickness is 1.4 mm, and if the supplier chooses materials with a wall thickness of 1.2mm or even thinner, they are all unqualified products. Please pay attention when buying.