Unqualified aluminum alloy doors and windows made of inferior aluminum profiles
will cause the aluminum profiles to deform due to the influence of sunlight, air and rain during use, and even cause the glass to break and fall off. 1. The oxide film is thin. National standards stipulate that the oxide film thickness of architectural aluminum profiles should not be less than 10um (micrometers). If the thickness is not enough, the surface of the aluminum profile is easy to rust and corrode. Usually, some aluminum profiles without production name, factory location, production license and qualification certificate in the random inspection have an oxide film thickness of only 2 to 4um, and some do not even have an oxide film. According to experts' estimates, for every reduction of 1um oxide film thickness, each ton of profile can reduce the cost of electricity consumption by more than 150 yuan. 2. The chemical composition is unqualified. The aluminum profile mixed with a large amount of miscellaneous aluminum and scrap aluminum can greatly reduce the cost, but it will cause the chemical composition of the building aluminum profile to be unqualified, and seriously endanger the safety of the construction project. 3. Reduce the wall thickness of the profile. For the 90 series sliding window type, according to the national standard, the minimum wall thickness of the aluminum profile is not less than 1.4mm, and some products are only 0.6 to 0.7mm. For the 46 series of floor bullet doors, the minimum wall thickness of the aluminum profile used in the national standard is not less than 1.62mm. During the random inspection, some products are only 0.97 to 1.18mm. 4. Inferior aluminum profiles greatly reduce the sealing time, reduce the loss of chemical reagents, and reduce costs, but the corrosion resistance of the profiles is also greatly reduced.
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