Quality of UPVC profiles: UPVC profiles are the decisive factor in the quality of plastic steel doors and windows. High-quality UPVC profiles should have a multi-cavity design, moderate wall thickness, and contain anti-aging and anti-UV additives. The appearance should be smooth and green in color. In addition, by comparing the cross-sections of different profiles, you can observe their color and feel for preliminary identification.
Quality of hardware accessories: The hardware of high-end doors and windows are all made of metal, and their inherent strength, appearance and usability directly affect the performance of doors and windows. Therefore, choosing hardware made of metal can improve the durability of your doors and windows.
Inspection of assembly quality: Observe whether the appearance of doors and windows is smooth and undamaged, whether the welding angles are neat, whether the hardware is complete, whether there is steel lining, etc. These are important indicators for evaluating the quality of door and window assembly.