The selection method of aluminum alloy doors and Windows

How to choose aluminum 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 sealing performance. The sealing performance directly affects the use 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, do not fade, do not fall off, almost no maintenance, spare parts have a long service life.
(4) Elegant decorative effect. Aluminum alloy doors and Windows have artificial oxide film and color into a composite film, this composite film is not only corrosion resistance, wear resistance, a certain fire resistance, and high brightness. Aluminum alloy doors and Windows due to light weight, processing and assembly precision, accurate, so open and close light and flexible, no noise.
Aluminum alloy material deformation of doors and Windows, push-pull and other phenomena are common. Consumers should note the following points when purchasing:
Look at the material. There are mainly 6 aspects for reference in the material use:
Thickness: There are 70 series and 90 series of aluminum sliding doors, and 70 series can be used for aluminum sliding doors inside the residence. The number of series indicates the number of millimeters of the thickness of the frame structure. Aluminum alloy sliding window has 55 series, 60 series, 70 series, 90 series four kinds. Series selection should be based on the size of the window and the local wind pressure value. The aluminum alloy sliding window used to close the balcony should not be less than 70 series.
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 moderately bend the profile by hand, and it should be able to return to its original state after letting go.
Chroma: 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 aluminum alloy profiles, there should be no depression or bulge.
5. Gloss: Aluminum alloy doors and Windows avoid choosing profiles with open bubbles (white spots) and ash (black spots) on the surface, as well as cracks, burrs, peeling and other obvious defects.
Oxidation degree: the thickness of oxide film should reach 10 microns. When purchasing, you can lightly scratch the surface of the profile to see whether the oxide film on the surface can be wiped off