1. Thickness: Aluminum sliding doors come in different series, such as 70 and 90. The number in the series indicates the thickness of the door frame in millimeters. For example, a 70 series aluminum sliding door is suitable for home use. When it comes to sliding windows, you can choose from 55, 60, 70, or 90 series. The selection should be based on window size and local wind pressure conditions. If you're installing an aluminum sliding window for a closed balcony, it's recommended to go for at least a 70 series to ensure durability and safety.
2. Strength: The tensile strength of the aluminum profile should be at least 157 N/mm², and the yield strength should be no less than 108 N/mm². When purchasing, you can gently bend the frame with your hand. If it returns to its original shape after releasing, it's a good sign of quality and flexibility.
3. Color Consistency: The color of the aluminum profiles should be uniform across the entire product. If there are visible color differences, it’s best to avoid purchasing that item, as it may indicate poor manufacturing or finishing processes.
4. Flatness: Check the surface of the aluminum profile for any dents, bumps, or irregularities. A high-quality product should have a smooth and even finish without any deformations.
5. Surface Quality: Look out for defects such as air bubbles (white spots), ash spots (black spots), cracks, burrs, peeling, or other visible imperfections. These can affect both the aesthetics and the performance of the aluminum doors and windows.
6. Oxidation Layer: The oxide film on the surface should be at least 10 microns thick. To check this, you can gently scratch the surface. If the oxide layer easily rubs off, it might not meet the required standards for durability and corrosion resistance.
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