Inferior aluminum profiles have the following four characteristics:
1. The thickness of the oxide film is thin. The national standard stipulates that the thickness of the oxide film of the building aluminum profile should not be less than 10um (microns). The thickness is not enough, and the surface of the aluminum profile is easy to rust and corrode. In the sampling inspection, some aluminum profiles without production name, factory address, production license and certificate have an oxide film thickness of only 2 to 4um, and some even have no oxide film. According to expert estimates, for every 1um reduction in oxide film thickness, the cost of electricity consumption can be reduced by more than 150 yuan per ton of profile. For example, solar aluminum profiles are aluminum materials whose surface has been oxidized by sand surface and are not easy to rust and be corroded, and the thickness of the oxide film is generally more than 15U.
2. The chemical composition is unqualified. Aluminum profiles mixed with a large number of miscellaneous aluminum and scrap aluminum can greatly reduce costs, but will lead to unqualified chemical composition of architectural aluminum profiles, which seriously endangers the safety of construction projects.
3. Reduce the wall thickness of the profile.
4. 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.
