Is it a broken bridge insulation aluminum profile with a main profile wall thickness greater than 1.4mm; The color of the same aluminum alloy profile should be consistent. If the color difference is obvious, it is not suitable for purchase; Check the surface of the aluminum alloy profile for any dents or bulges; The thickness of the oxide film should reach 10 microns. When purchasing, you can lightly scratch the surface of the profile to see if the oxide film on its surface can be wiped off.
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