[China Aluminum Network] Substandard aluminum alloy doors and windows, due to the impact of sunlight, air, rain, etc., will cause the deformation of aluminum profiles, and even cause the glass to crack and fall off. St624 Fixed Stereo Microscope ,Amscope Dissecting Microscope,Stereo Inspection Microscope,Swift Stereo Eighty Microscope Ningbo Beilun Kalinu Optoelectronic Technology Co.,Ltd , https://www.yxmicroscope.com
Oxide film thickness is thin. The national standard specifies that the thickness of the aluminum oxide film in the building shall not be less than 10 μm. The thickness is not enough. The surface of aluminum profiles is rusted and corroded. Sampling inspection of some no name, site, production license, certification of aluminum profiles, the oxide film thickness is only 2 to 4um, and some even without oxide film. According to experts' estimates, the thickness of the oxide film can be reduced by more than 150 yuan per ton of material for each ton of material.
Unqualified chemical composition. The introduction of a large amount of aluminum and aluminum scrap aluminum can greatly reduce the cost, but will lead to the failure of the chemical composition of aluminum profiles, seriously jeopardizing the safety of construction projects.
Reduce profile wall thickness. 90 series sliding window type, according to national standards, the wall thickness of aluminum profiles is not less than 1.4mm, and some Guangdong products are only 0.6 to 0.7mm. 46 series of floor-ejection type, the national standard for the use of aluminum wall thickness is not less than 1.62mm, sampling, Guangdong some of the products only 0.97 to 1.18mm.
The inferior aluminum profiles greatly reduce the sealing time, reduce the loss of chemical reagents, and reduce the cost, but the corrosion resistance of profiles is also greatly reduced.