[China Aluminum Industry Network] When evaluating the pros and cons of aluminum doors and windows, there are six key factors to consider when selecting materials:
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1. Thickness: Aluminum sliding doors come in different series, such as 70 and 90. For home use, the 70 series is usually sufficient. The series number represents the thickness of the door frame in millimeters. For sliding windows, common series include 55, 60, 70, and 90. The choice of series should depend on the size of the window opening and the local wind pressure. If you're installing sliding windows for a closed balcony, it's recommended to choose at least the 70 series to ensure durability.
2. Strength: The tensile strength should be around 157 Newtons per square meter, while the yield strength should be no less than 108 Newtons per square millimeter. When purchasing, you can gently bend the profile with your hands; if it returns to its original shape after releasing, it's a good sign of quality.
3. Color: The color of the aluminum alloy should be consistent throughout. If there's a noticeable difference in color, it may indicate poor quality or uneven coating, which is not advisable for purchase.
4. Flatness: Check the surface of the aluminum profile for any dents or bulges. A flat and even surface is essential for both aesthetics and functionality.
5. Gloss: Avoid buying aluminum doors and windows that have surface imperfections like bubbles (white spots), ash (black spots), cracks, burrs, peeling, or other visible defects. These can affect both appearance and performance.
6. Oxidation Resistance: The oxide film on the surface should be at least 10 microns thick. To check this, you can lightly rub the surface with your finger. If the oxide layer easily comes off, it might not meet quality standards.
In addition to these six factors, it's also important to consider the brand reputation, warranty, and installation quality. A well-made aluminum door or window not only enhances the look of your home but also improves energy efficiency and security. Always ask for samples and inspect them carefully before making a final decision.