How to choose aluminum alloy doors and windows
Compared with steel wood doors and windows, aluminum alloy doors and windows have the following advantages:
1) Light weight and high strength. The density is only 1/3 of steel.
2) Good sealing performance. Airtight performance directly affects the function of doors and windows and energy consumption. The sealing performance includes four aspects: air tightness, water tightness, heat insulation and sound insulation.
3) Good durability, easy to use and maintain. Aluminum alloy doors and windows do not rust, fade, or fall off, almost no maintenance is required, and the service life of spare parts is extremely long.
4) The decorative effect is elegant. The surface of aluminum alloy doors and windows has an artificial oxide film and is 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 high gloss. Due to the light weight of aluminum alloy doors and windows, the processing and assembly are precise and accurate, so the opening and closing are light and flexible, and there is no noise.
It is not uncommon for aluminum alloy materials to have doors and windows deformed, pushing and pulling, etc. Consumers should pay attention to the following points when purchasing:
Take a look at the material. There are 6 main aspects for reference in materials:
⒈Thickness: There are two types of aluminum alloy sliding doors: 70 series and 90 series, and 70 series can be used for aluminum alloy sliding doors inside the house. The series number indicates the thickness of the door frame in millimeters of the construction dimension. 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 determined according to the size of the window opening and the local wind pressure value. Aluminum alloy sliding windows used as closed balconies should not be less than 70 series.
⒉ 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 be able to return to its original shape after letting go.
3. Chromaticity: The same aluminum alloy profile should have the same color and luster. If the color difference is obvious, it is not suitable for purchase.
⒋ Flatness: Check the surface of the aluminum alloy profile, there should be no dents or bulges.
⒌Gloss: Aluminum alloy doors and windows should avoid buying profiles with open bubbles (white spots) and slag (black spots) on the surface, as well as cracks, burrs, peeling and other obvious defects.
⒍Oxidation degree: The thickness of the oxide film should reach 10 microns. When purchasing, you can swipe on the surface of the profile to see if the oxide film on the surface can be wiped off.