Doors and windows made of aluminum profiles extruded from aluminum alloys 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, economical and durable, diversified colors, pollution-free, and can be recycled and reused. They are widely used in high-end public buildings. General residential and industrial plants. Aluminum alloy windows can be divided into ordinary aluminum alloy windows and energy-saving aluminum alloy windows. The energy-saving aluminum alloy window is 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 windows", the minimum measured wall thickness of the main section of the main section of the main force should not be less than 1.4mm. At present, the aluminum alloy profile for the production of doors and windows on the market is mainly subjected to force. The minimum measured wall thickness of the unit substrate is less than 1.4 mm. If the wall thickness is too small, it will directly affect the life of the window and the wind pressure resistance. 2. Airtight performance. The airtight performance index of the energy-saving aluminum alloy window is: the air permeation amount per unit length q1≤1.5 (m3/(m·h)); the air permeation amount per unit area is q2≤4.5 (m3/(m2·h)). Due to the poor quality of the selected sealing strip and the level of production, the airtight performance of many aluminum alloy windows does not 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. The standard requires K≤3.0W/(m2·K). 4. Glass properties (visible light transmittance, shading coefficient, dew point). It is also one of the energy-saving indicators for evaluating aluminum alloy windows. According to the requirements of the current energy-saving window, the shading coefficient is ≤0.55, the visible light transmittance is ≥0.4, and the dew point is ≤-40°C. Shopping tips 1. Look at the quality of production. There should be no obvious damage to the decorative surface of the door and window. It means that the protective film on the surface of the door and window should not have scratches and scratches. There should be no noticeable chromatic aberration on the colored surfaces of adjacent members on the doors and windows. There should be no aluminum chips, burrs, oil spots or other stains on the surface of the 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 heat insulation aluminum profile, the main profile wall thickness should be greater than 1.4mm; the same aluminum alloy profile should have the same color, if the color difference is obvious, that is, it should not be purchased; check the surface of the aluminum alloy profile, there should be no depression or bulging; aluminum Alloy doors and windows avoid the appearance of open air bubbles (white spots) and ash (black spots), as well as cracks, burrs, peeling and other obvious defects; oxide film thickness should be 10 microns, can be light on the surface of the profile when purchased Scratch and see if the oxide film on the surface can be wiped off. 3. Look at the assembly quality. Repeatedly switch multiple times to check whether the switch force is too heavy; whether the sealing strip is firm; whether the hardware assembly is complete; whether the sash window frame overlap quantity meets the requirements (standard requirements flat window is not less than 6mm, sliding window is not 8mm). 4. Look at the glass. Whether it is hollow glass, there is no coating. [Follow the WeChat public account "Jiuzhengmen Window Network" to view the latest hot article "Your door factory is being messed up by these people!!!" More industry exchanges please join the Jiuzhengmen window network exchange group] Garden Light,Solar Garden Wall Light,Outdoor Garden Lights,Garden Lamp Post NINGBO ZHENGUO INTELLINGENT LIGHTING CO.,LTD , https://www.zguolight.com