Doors and windows made of aluminum profiles extruded from aluminum alloy are called aluminum alloy doors and windows. Aluminum alloy doors and windows have become one of the main building door and window products in China due to their light weight, high strength, good performance, strong decoration, economic durability, diverse colors, no pollution, and recyclability. They are widely used in high-end public buildings, general residential buildings, 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 insulated aluminum alloy profiles and energy-saving glass (insulating glass, LOW-E glass, heat absorbing glass, coated glass, vacuum glass, etc.).

Key indicators

1. Wall thickness of the profile. According to the requirements of the national standard GB/T8478-2008 "Aluminum Alloy Doors and Windows", the minimum measured wall thickness of the main load-bearing unit base material of the main profile section should not be less than 1.4mm. At present, the aluminum alloy profiles for door and window production sold in the market mainly bear the minimum measured wall thickness of the base material, which is mostly less than 1.4mm. Excessive wall thickness will directly affect the lifespan and wind resistance performance of the window.

2. Air tightness performance. The air tightness performance index of energy-saving aluminum alloy windows is: unit seam length air permeability q1 ≤ 1.5 (m3/(m · h)); The air permeability per unit area q2 ≤ 4.5 (m3/(m2 · h)). However, due to the poor quality and manufacturing level of the selected sealing strips, the air tightness performance of many aluminum alloy windows cannot meet the requirements of energy-saving windows.

3. Heat transfer coefficient (insulation performance). The heat transfer coefficient is one of the energy-saving indicators for directly evaluating 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 for energy-saving windows, the shading coefficient is ≤ 0.55, the visible light transmittance is ≥ 0.4, and the dew point is ≤ -40 ° C.

Quality Tips

1. Check the quality of production. The decorative surface of doors and windows should not have obvious damage, which means that the protective film on the surface of doors and windows should not have scratches or abrasions. There should be no significant color difference on the colored surfaces of adjacent components on doors and windows. There should be no aluminum shavings, burrs, oil stains or other stains on the surface of doors and windows, and there should be no adhesive overflow at the assembly joints.

2. Check the material. Is it a broken bridge insulation aluminum profile with a main profile wall thickness greater than 1.4mm; The color of the same aluminum alloy profile should be consistent. If the color difference is obvious, it is not suitable for purchase; Check the surface of the aluminum alloy profile for any dents or bulges; Aluminum alloy doors and windows should avoid purchasing profiles with open bubbles (white spots) and ash residue (black spots) on the surface, as well as obvious defects such as cracks, burrs, peeling, etc; The thickness of the oxide film should reach 10 microns. When purchasing, you can lightly scratch the surface of the profile to see if the oxide film on its surface can be wiped off.

3. Check the assembly quality. Repeatedly switch on and off multiple times, check if the switching force is too heavy; Is the sealing strip secure; Is the hardware assembly complete; Whether the overlap amount of window sashes and frames meets the requirements (standard requirements for casement windows are not less than 6mm, and sliding windows are not less than 8mm).

4. Look at the glass. Whether it is insulated glass, whether there is coating, etc.