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Why aluminum door with more and more? How do I know the quality of aluminum alloy doors?

Why aluminum door with more and more?
First, starting from the aluminum door Features:
First, the durability of aluminum alloy used in the same window, steel, wood and other materials;
Second, aluminum windows and doors are currently the most commonly used basic bridge, which is to use insulated aluminum indoor and outdoor bar will be separated, so that you can greatly improve the insulation effect; Also with the use of hollow glass together after , it is completely eliminated the indoor condensation phenomenon;
Third, light weight, high strength: aluminum alloy compositions are mostly thin-walled hollow core section, easy to use, reduce weight, and the cross-section has a high flexural strength, doors and windows made of durable, deformation.
Fourth, good sealing performance: Aluminum lends itself to extrusion, profile cross-section size, accuracy, and processing accuracy.
Optional waterproof, elasticity and durability are relatively good sealing material, such as layering and silicone rubber sealant series.
In terms of profile, various seal fixing groove, has been accompanied by sections in the extrusion molding process is completed together, to install the sealing material for the creation of favorable conditions.
Fifth, the attractive appearance: anodized aluminum surface after the treatment, the liver can present the ancient copper lead. Gold, silver and other colors, you can choose any river, through the oxidation and smooth shine. Large sash frame, can insert large areas of glass, so brightly lit interior, enhancing the facade between the actual situation of indoor and outdoor contrast, make the room more rich layers.
Sixth, corrosion resistance: aluminum alloy oxide layer does not fade. Do not fall off, do not need paint, easy maintenance, no maintenance.
How do I know the quality of aluminum alloy doors?
How to distinguish good and bad aluminum door:
First, look at the use of materials. Quality aluminum windows and doors used in aluminum, thickness, strength and oxide film, should comply with the relevant provisions of national standards, should be 1.2 mm wall thickness, tensile strength reached 157 Newtons per square millimeter, the yield strength to reach every Newton 108 mm, the thickness of the oxide film should reach 10 microns. If you can not reach the above criteria, it is of poor quality aluminum windows and doors, can not be used.
Second, look processing. High-quality aluminum doors and windows, precision machining, installation stress, good sealing performance, switch freely. Poor quality of aluminum doors and windows, aluminum blind selection series and specifications, processing shoddy, to sawing instead of milling is not required for installation, sealing performance is poor, switch does not ease, not only emerge glass burst and leaking air leakage phenomenon, and encounter to strong winds and external, easy to push and pull part or glass scraped off or touch down, wounding and breaking things.
Third, look at the price. In general, high-quality aluminum windows and doors because of the high production costs, the price is higher than the low-grade aluminum alloy doors and about 30%. Some have only 0.6-0.8 mm wall thickness made of aluminum alloy doors and windows, tensile strength and yield strength is much lower than the relevant national standards, the use of very safe. In addition, there are more self-employed processing aluminum windows and doors, they do not know the structural characteristics and properties of aluminum windows and doors. In order to reduce the cost of cutting corners, shoddy, larger product risks, generally should not be used. The best selection of regular aluminum windows and doors manufacturer of the product.