1. Thickness: Aluminum sliding doors come in different series, such as 70 and 90. The number in the series refers to the thickness of the door frame in millimeters. For residential use, 70 series aluminum sliding doors are commonly used. When it comes to aluminum sliding windows, you can choose from 55, 60, 70, or 90 series. The selection should be based on the window size and local wind pressure conditions. If the sliding window is used for a closed balcony, it's recommended to go for at least the 70 series to ensure durability and stability.
2. Strength: The tensile strength of the aluminum profile should be at least 157 N/mm², while the yield strength should not be less than 108 N/mm². When purchasing, you can gently bend the profile with your hand and check if it returns to its original shape once released. This test helps determine the quality and flexibility of the material.
3. Color Consistency: The color of the aluminum profiles should be uniform across the entire product. If there is a noticeable difference in color, it may indicate poor quality or improper manufacturing, and it’s better to avoid such products.
4. Flatness: Inspect the surface of the aluminum profile for any dents, bumps, or irregularities. A high-quality aluminum profile should have a smooth and even finish without any visible deformations.
5. Surface Finish: Avoid aluminum doors and windows that have visible defects such as air bubbles (white spots), ash spots (black spots), cracks, burrs, peeling, or other obvious flaws. These issues can affect both the aesthetics and performance of the product.
6. Oxidation Layer: The oxide film on the surface of the aluminum should be at least 10 microns thick. To check this, you can gently scratch the surface with a soft cloth or tool. If the oxide layer can be easily removed, it might be too thin, which could lead to corrosion over time.
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