The characteristics of aluminum alloy doors and windows Compared with steel and wood doors and windows, aluminum alloy doors and windows have the following advantages:

1. Light weight and high strength. The density is only l/3 of steel.
2. Good airtight performance. Airtight performance directly affects the use function and energy consumption of doors and windows. Airtight performance includes four aspects: airtightness, watertightness, heat insulation and sound insulation.
3. Good durability, easy to use and maintain. Aluminum alloy doors and windows do not rust, fade, fall off, require almost no maintenance, and the service life of spare parts is extremely long.
4. The decorative effect is elegant. The surfaces of aluminum alloy doors and windows are artificially oxidized and colored to form a composite film layer. This composite film is not only corrosion-resistant and wear-resistant, but also has a certain fire resistance, and its gloss is extremely high. Aluminum alloy doors and windows are easy to open and close without noise due to their light weight and precise and accurate processing and assembly.

The doors and windows of aluminum alloy materials may be deformed, pushed and pulled, etc. There are mainly 6 aspects that can be referred to in terms of materials and materials when purchasing:

1. Thickness: There are two kinds of aluminum alloy sliding doors, 70 series and 90 series. The aluminum alloy sliding doors inside the house can be 70 series. The series number represents the mm of the thickness of the door frame. There are four kinds of aluminum alloy sliding windows: 55 series, 60 series, 70 series and 90 series. The selection of the series should be based on the size of the window opening and the local wind pressure value. The aluminum alloy sliding windows used as closed balconies should not be less than 70 series.
2. Strength: The tensile strength should reach 157 Newtons per square millimeter, and the yield strength should reach 108 Newtons per square millimeter. When purchasing, you can bend the profile moderately with your hands, and it should return to its original shape after letting go.
3. Chromaticity: The color of the same aluminum alloy profile should be consistent. If the color difference is obvious, it is not suitable to buy.
4. Flatness: Check the surface of the aluminum alloy profile, there should be no depression or bulge.
5. Glossiness: Aluminum alloy doors and windows should avoid purchasing profiles with open air bubbles (white spots) and ash residue (black spots) on the surface, as well as obvious defects such as cracks, burrs, and peeling.
⒍Oxidation degree: The oxide film thickness should reach 10 microns. When purchasing, you can lightly scratch the surface of the profile to see if the oxide film on the surface can be wiped off.