1. Strength Requirements: Self-adhesive window screens must have a tensile strength of 157 Newtons per square meter and a yield strength of 108 Newtons per square millimeter. When purchasing, try to bend the profile slightly by hand; it should return to its original shape after release.
2. Glossiness Standard: When selecting aluminum alloy door and window profiles, avoid products with obvious surface defects such as open bubbles (white spots), ash (black spots), cracks, burrs, and peeling.
3. Oxidation Inspection: The oxide film on the profile surface should be at least 10 microns thick. During the purchase process, gently run a finger across the profile surface to observe whether the oxide film easily rubs off.
4. Color Consistency: The color of the same aluminum alloy profile should be consistent. If there is a significant color difference, it should not be purchased.
5. Flatness Assessment: Inspect the aluminum alloy profile for any dents or bulges. The surface should be flat.
