First, the wind pressure resistance and watertight performance: Due to the low strength and rigidity of the steel doors and windows, although the lining is strengthened, its wind pressure resistance and watertight performance are about two grades lower than that of the aluminum alloy doors and windows. Because the lining steel of plastic steel doors and windows is not connected to the complete frame system at the corners of the inner cavity of the profile, the plastic welding angular strength of the window frame, the four corners of the fan and the butyl byte point is relatively low. Second, airtight performance: Because the frame and fan components are welded, the airtightness of the steel doors and windows should be slightly better than that of the aluminum alloy doors and windows that are connected by screws. However, the dimensions of the heavy-duty sliding door profiles are relatively high, and the frame and fan are tightly matched, so the two are still in At a level. Third, insulation performance: The insulation performance of plastic steel doors and windows is not as good as that of aluminum alloy doors and windows, and the frame window of aluminum alloy windows accounts for about 10% smaller than the plastic steel doors and windows. Furthermore, the aluminum door and window frame fan profiles are not solid, and the hollow aluminum profiles are thicker than plastic. The wall thickness of the profile is about 40% smaller. Fourth, lighting performance: The lighting performance of plastic steel doors and windows is worse than that of aluminum alloy doors and windows. The shading area of ​​framed fan members is about 10% larger than that of aluminum alloy doors and windows. The visual field and decorative effect are poor, which is not conducive to energy saving and consumption reduction of architectural lighting. Five, sound insulation performance: The sound insulation performance of the heavy sliding door is mainly due to the sound insulation effect of the glass which accounts for about 80% of the window area. Aluminum alloy doors and windows "have good glass thickness, construction and sealing properties, so its sound insulation is very good. Magnetics Toys,Toy Magnet,Neodymium Magnet Toys,Magnetic Squares Toy Honesun Industrial Co.,Limited , https://www.chinamagnetise.com