When evaluating the pros and cons of aluminum doors and windows, there are six main factors to consider in terms of material quality: 1. Thickness: Aluminum sliding doors come in different series such as 70 and 90. The 70 series is commonly used in homes, where the number indicates the thickness of the door frame in millimeters. For sliding windows, common series include 55, 60, 70, and 90. Choosing the right series depends on the window size and local wind pressure. If you're using aluminum sliding windows for a closed balcony, it's recommended to go for at least the 70 series to ensure durability. 2. Strength: The tensile strength should be around 157 N/mm², while the yield strength should be about 108 N/mm². When testing, gently bend the profile with your hand. If it returns to its original shape when released, it's a good sign of quality. 3. Color Consistency: The color of the aluminum profiles should be uniform across all pieces. If there's a noticeable color difference, it may not be a suitable choice. 4. Flatness: Inspect the surface of the aluminum profile to ensure it's smooth without any dents or bulges. 5. Surface Finish: Avoid any visible defects like air bubbles (white spots), ash (black spots), cracks, burrs, peeling, or other obvious flaws that could affect both appearance and performance. 6. Oxidation Resistance: The oxide film on the surface should be at least 10 microns thick. To test, lightly scratch the surface and check if the oxide layer can be easily removed. If it wipes off easily, it may indicate poor quality. By paying attention to these six aspects, you can make a more informed decision when selecting aluminum doors and windows for your home. Whether you're looking for energy efficiency, durability, or aesthetic appeal, understanding these key features will help you choose the best option for your needs. Aluminum Pivot Doors,Pivot Doors Exterior,Wooden Pivot Doors,Pivot Front Door Lemon Building Material Co., Ltd. , https://www.lemonbuilding.com