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When evaluating the pros and cons of aluminum doors and windows, there are six main factors to consider:
1. Thickness: Aluminum sliding doors come in different series such as 70 and 90. The 70 series is commonly used in homes, with the number indicating the thickness of the frame in millimeters. For sliding windows, common options include 55, 60, 70, and 90 series. The choice of series should be based on window size and local wind pressure. If the window is for a closed balcony, it's recommended to use at least the 70 series for better durability.
2. Strength: The tensile strength should be around 157 Newtons per square meter, and the yield strength should be approximately 108 Newtons per square millimeter. When testing, you can gently bend the profile with your hand and check if it returns to its original shape when released. This helps determine the quality of the material.
3. Color Consistency: The color of the aluminum profiles should be uniform. If there’s a noticeable color difference, it may indicate poor quality or uneven coating, which is not ideal for purchase.
4. Flatness: Inspect the surface of the aluminum profile to ensure it is smooth and free from dents or bulges. A flat surface indicates good manufacturing quality.
5. Surface Finish: Look for any visible defects like air bubbles (white spots), ash (black spots), cracks, burrs, peeling, or other imperfections. These can affect both the aesthetics and performance of the product.
6. Oxidation Resistance: The oxide film on the surface should be at least 10 microns thick. To test this, you can gently scratch the surface and see if the oxide layer comes off easily. A high-quality product will have a durable and even oxide layer that resists wear and tear over time.
By paying attention to these six aspects, you can make a more informed decision when choosing aluminum doors and windows, ensuring they meet both functional and aesthetic requirements.
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