The following are the methods to judge the quality of aluminum alloy shell:

1. Check the degree of oxidation: When purchasing, you can lightly scratch the surface of the profile to see if the oxide film on the surface can be wiped off.

2. Check the color: The color of the same aluminum alloy profile should be consistent. If the color difference is obvious, it is not suitable for purchase. Generally, the cross-section color of a normal aluminum alloy profile is silver-white and the texture is uniform. If the color is dark, it can be determined that it is recycled aluminum or waste aluminum forged.

3. Check the flatness: Check the surface of the aluminum alloy profile, there should be no depression or bulging. The aluminum profile processed by a regular manufacturer has a flat and bright surface. If it is a small workshop, due to the machine or raw materials, the profile surface will appear slightly bumpy. The balcony window synthesized by such an aluminum alloy profile is very easy to oxidize and deform in the later stage.

4. Check the strength: When purchasing, you can bend the profile moderately by hand. If the profile can be bent without effort, then it can be determined that the strength of the aluminum profile does not meet the standard. In addition, the strength of the profile is not the harder the better. Aluminum has a certain toughness and is not a hard material. It can be forged into different shapes by using this characteristic. Therefore, the owner needs to identify the brand and observe carefully when purchasing.

5. Glossiness: Aluminum alloys should avoid purchasing profiles with open bubbles and ash on the surface, as well as cracks, burrs, peeling and other obvious defects. If the above phenomena occur, it can be determined that it is recycled aluminum or waste aluminum secondary processing. Such materials are prone to cracking and oxidation in the later stage due to uneven texture and messy alloy ratio.