Key quality indicators and purchase points of energy-saving aluminum alloy windows

Doors and windows made of aluminum extruded aluminum profiles are called aluminum alloy doors and windows. Aluminum alloy doors and windows have become one of the main building door and window products in my country due to their light weight, high strength, good performance, strong decoration, economical durability, diversified colors, non-polluting, General residential and industrial plants. Aluminum alloy windows can be divided into ordinary aluminum alloy windows and energy-saving aluminum alloy windows. Energy-saving aluminum alloy windows are made of heat-insulating aluminum alloy profiles and energy-saving glass (insulating glass, LOW-E glass, heat-absorbing glass, coated glass, vacuum glass, etc.).　　Key indicators　　1. Profile wall thickness. According to the requirements of the national standard GB/T8478-2008 'Aluminum Alloy Doors and WindowsAt present, the minimum measured wall thickness of the main force-bearing unit base material of aluminum alloy profiles sold on the market for the manufacture of doors and windows is less than 1.4mm. If the wall thickness is too small, it will directly affect the service life and wind pressure resistance of the window.　　 2. Airtight performance. The airtight performance index of energy-saving aluminum alloy windows is: air permeability per unit length q1≤1.5 (m3/(m·h)); air permeability per unit area q2≤4.5 (m3/(m2·h)). However, due to the poor quality of the selected sealing strip and the influence of the production level, the airtight performance of many aluminum alloy windows fails to meet the requirements of energy-saving windows.　　 3. Heat transfer coefficient (heat preservation performance). The heat transfer coefficient is one of the energy-saving indicators for direct evaluation of aluminum alloy windows, and the standard requires K≤3.0W/(m2·K).　　 4. Glass performance (visible light transmittance, shading coefficient, dew point). It is also one of the energy-saving indicators for evaluating aluminum alloy windows. According to the current requirements of energy-saving windows, the shading coefficient is ≤0.55, the visible light transmittance is ≥0.4, and the dew point is ≤-40°C.　　Purchase tips　　1. Look at the production quality. There should be no obvious damage on the decorative surface of doors and windows, which means that the protective film on the surface of doors and windows should not have scratches. There should be no obvious chromatic aberration on the colored surface of adjacent components on doors and windows. There should be no aluminum chips, burrs, oil spots or other stains on the surface of doors and windows, and there should be no spilled adhesive at the assembly joints.　　 2. Look at the material. Whether it is a broken bridge thermal insulation aluminum profile, the wall thickness of the main profile should be greater than 1.4mm; the color of the same aluminum alloy profile should be the same, if the color difference is obvious, it is not suitable to buy; check the surface of the aluminum alloy profile, there should be no depression or bulging; For alloy doors and windows, avoid choosing profiles with open bubbles (white spots) and slag (black spots), cracks, burrs, peeling and other obvious defects; the thickness of the oxide film should reach 10 microns. Scratch it to see if the oxide film on the surface can be wiped off.　　 3. Look at the assembly quality. Repeat the switch many times to check whether the switching force is too heavy; whether the sealing strip is firm; whether the hardware assembly is complete; whether the overlap of the sash window frame meets the requirements (standards require that the casement window is not less than 6mm, and the sliding window is not less than 8mm).　　 4. Look at the glass. Whether it is hollow glass and whether there is coating.
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