1. Check whether the alloy aluminum plate has obvious distortion, whether the surface is smooth and flat, whether there are cracks or boldness, scratches, and burrs. If you find any, it is best not to buy.
2. Carefully check whether the surface color of the alloy aluminum plate has different shades of color difference. The color difference means that the quality is not good enough. Of course, you can also compare profiles of the same type together. Of course, if the color difference is too obvious, it is best not to buy it. Check whether the section thickness of the alloy aluminum plate is the same as the marked model.
3. Use a smooth hard object to scratch the surface of the alloy aluminum plate, and a white scratch will be left. Wipe the alloy aluminum plate gently with your hands and observe. If it cannot be wiped off, it means that the quality of the material may be problematic, but on the contrary, if It can be easily wiped off, indicating that the thickness of the oxide film on the surface of the profile is qualified.
