Oxide film thickness is thin. The national standard stipulates that the oxide film thickness of architectural aluminum profiles should not be less than 10um (microns). If the thickness is not enough, the surface of the aluminum profile is easy to rust and corrode. Some aluminum profiles without production name, factory address, production license, and certificate of conformity in the random inspection have an oxide film thickness of only 2 to 4um, and some even have no oxide film. According to expert estimates, every reduction in the thickness of the oxide film by 1um can reduce the cost of electricity consumption by more than 150 yuan per ton of profiles.
The chemical composition is unqualified. Aluminum profiles mixed with a large amount of miscellaneous aluminum and waste aluminum can greatly reduce the cost, but it will lead to unqualified chemical composition of architectural aluminum profiles, which seriously endangers the safety of construction projects.
Reduce profile wall thickness. 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 Guangdong products are only 0.6 to 0.7mm. For the 46 series floor-to-door type, the minimum wall thickness of the aluminum profile used by the national standard is not less than 1.62mm. During the sampling inspection, some products in Guangdong are only 0.97 to 1.18mm.
Inferior aluminum profiles greatly reduce the sealing time, reduce the loss of chemical reagents, and reduce the cost, but the corrosion resistance of the profiles is also greatly reduced
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