With the progress of the times, many people began to pay attention to the life quality. The comfort of live environment is an important attention area, therefore, in recent years, aluminum windows and doors became more popular for the consumers. You can see it in daily life, here you need to know how to judge the material quality from 6 points

1. Thickness: Aluminum sliding door profiles could be divided into 2 series: 70 series and 90 series. Interior doors could apply 70 series profile. 70 series means the width of the door frame is 70mm. Meanwhile, aluminum sliding window profiles have 4 series: 55 series, 60 series, 70 series, 90 series. You could decide which series for your windows according to the hole size and local window pressure value. If use for balcony windows, the aluminum sliding window width could not be small than 70 series.

2. Strength: Tensile strength should reach per square mm 157 Newton and yield strength should reach per square mm 108 Newton. When shopping, you could bend the profile with hand moderately , after the release should it be able to restore.

3. Color: The color of the same root aluminum alloy section should be consistent, if color difference is obvious, it is not advisable to buy.

4. Surface smoothness: Check the surface of the aluminum alloy profile, it should be without sunken or crowning.

5. Gloss: When purchase aluminum alloy windows and doors to avoid open any air bubble ( white spots ) and ash ( black spots ), and cracks, burr, Peeling and other obvious defects.

6. Oxidation degree: The thickness of the oxide film shall reach 10 microns. When shopping the aluminum windows and doors, you can scratch softly on the profile surface to see if the surface of the oxide can be erased.