We can judge the quality of aluminum doors and windows through the selection of aluminum profiles, the quality of aluminum surface treatment and internal processing, and the price of aluminum alloy doors and windows. So, what is the quality standard of aluminum alloy doors and windows?
The quality standard of aluminum alloy doors and windows is judged from many factors
1、 Materials for aluminum alloy doors and windows
The thickness, strength and oxide film of aluminum profiles used for high-quality aluminum alloy doors and windows should comply with the relevant national standards. The wall thickness of the main load-bearing bars of aluminum alloy windows should be more than 1.4mm, the wall thickness of the main stress bars of the aluminum alloy doors should be more than 2.0mm, the tensile strength should be 157 n / m2, the yield strength should be 108 n / m2, and the oxide film thickness should be 10.0 mm Micron. If can not reach the above standard, it is inferior aluminum alloy door and window, cannot use.
2、 Processing of aluminum alloy doors and windows
High quality aluminum alloy doors and windows, good sealing performance. After blind selection of aluminum profile series and specifications, rough processing, saw cutting instead of milling, installation not in accordance with requirements, poor sealing performance, not easy to switch, not only air and rain leakage, but also glass burst and other phenomena, and encounter strong wind and external force, it is easy to pull part or glass scraping or falling, damage and injury.
3、 Price of aluminum alloy doors and windows
In general, the cost of aluminum alloy doors and windows is 30% higher than that of high-quality aluminum doors and windows. The tensile strength and yield strength of aluminum alloy doors and windows made of aluminum profiles with wall thickness of only 0.6-0.8mm are much lower than the relevant national standards, so they are very dangerous to use. In addition, the processing of aluminum alloy doors and windows more individual, they do not understand the structural characteristics and performance of aluminum alloy doors and windows. In order to reduce costs, shoddy work and shoddy materials, such aluminum alloy doors and windows have greater hidden dangers, and are generally not suitable for use. When selecting aluminum alloy doors and windows, it is better to choose the products of regular aluminum alloy doors and windows manufacturers. Here is a special note: the national standard profile thickness is 1.4mm, if the supplier chooses 1.0mm or 1.2mm wall thickness or even thinner materials, they are all unqualified aluminum alloy doors and windows products, which should be paid special attention to.
4、 Look at the material of aluminum alloy doors and windows
Materials are mainly reflected in the following six aspects:
1. Thickness: there are 70 series and 90 series aluminum alloy sliding doors and windows, and 70 series can be used for aluminum alloy sliding doors inside residential buildings. The number of aluminum alloy series indicates the thickness of door frame and the number of mm of structural dimension. There are four kinds of common aluminum alloy sliding windows: 55 series, 60 series, 70 series and 90 series. The selection should be determined according to the size of the window opening and the local wind pressure value. The aluminum alloy sliding window used as the closed balcony should not be less than 70 series.
2. Strength: tensile strength should reach 157 n / m2 and yield strength should reach 108 n / m2. When purchasing, the profile can be moderately bent, and it should be able to return to its original state after release.
3. Color: the same aluminum alloy profile color should be consistent, if the color difference is obvious, it is not suitable to purchase.
4. Flatness: check the surface of aluminum alloy profile, there should be no depression or bulge.