1. Check whether the surface of aluminum alloy profile is concave or convex; Aluminum alloy doors and windows should avoid buying profiles with obvious defects such as bubbles (white spots), dusting (black spots), cracks, burrs and peeling.
2. The profile thickness of aluminum alloy doors and windows is preferably above 1mm, because under the premise of normal use, such profiles will not be deformed for 5 to 8 years.
3. High-quality aluminum alloy doors have fine processing and exquisite welding, and the splicing place is very flat, while inferior aluminum alloy doors and windows are shoddy, and the corners of door frames cannot be spliced flat, and sometimes even large gaps appear.
4. When choosing the aluminum alloy door with glass inlay, especially the product designed with insulating glass, we must pay attention to its sealing performance.
5. Pay attention to the quality of hardware: the quality of hardware accessories is directly related to the service life of aluminum alloy doors and windows.
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