If you are considering a purchase, here are several key aspects to evaluate:
*Profiles: Pay attention to the aluminum alloy grade (e.g., 6063-T5 is common for construction), the wall thickness (which must meet national standards), and the surface treatment process (such as powder coating or electrophoresis); these factors determine the profile's strength, weather resistance, and aesthetic appeal.
*Thermal Break Strips: This is the key feature distinguishing standard aluminum windows from "thermal break" aluminum windows. Thermal break aluminum connects the interior and exterior aluminum sections using a low-thermal-conductivity PA66 nylon strip (the thermal break strip), creating a "thermal break" that significantly improves the window's thermal insulation performance. When inspecting, ensure the strip is made of nylon rather than cheap PVC.
*Glass: Check if it is insulated glass (double or triple glazing), note the thickness of the spacer/air gap (e.g., 9A, 12A, 15A), verify if inert gas (like argon) is used, and see if specialized glass like Low-E (low-emissivity) is employed to enhance thermal insulation or solar shading. Different glass configurations suit different needs.
*Hardware: This is an area worth investing in. Ask about the hardware brand and test the handle for smooth operation and a substantial feel. High-quality hardware should operate smoothly, feel solid, and lock securely.
*Sealing Design: Check that the sealing strips on the window frame and sash are intact and resilient; multi-layer sealing designs generally offer better performance. Try closing the sash to feel how tightly the sealing strips are compressed.
*Craftsmanship and Installation: "The product accounts for 30%, while installation accounts for 70%." Even the best window will underperform if installed improperly. Pay attention to the flatness of the corner joints and the uniformity and neatness of the sealant lines; also, ask the vendor about their installation process and the auxiliary materials used (such as sealants and mounting brackets).
