After nearly 30 years of development, aluminum alloy doors and windows have gradually replaced plastic aluminum doors and windows and become the leading product of doors and windows. It is far－fetched to say that aluminum alloy doors and windows are high－end products. Because of its strong metal characteristics, there is still a big gap with the matching of high－end furniture products. Coupled with human favor for wood, aluminum－wood composite doors and windows have gradually become the new darling of the high－end door and window market. Nowadays, aluminum－wood composite doors and windows can be seen in villas, hotels, high－end clubs and other occasions. So, how to buy high-end aluminum alloy doors and windows?

One,Product surface quality affects appearance
The quality of the door and window surface quality will directly affect the overall installation effect afterwards, so you should pay attention to the quality of the door and window surface when purchasing from the following aspects: 　1. There should be no obvious damage to the decorative surface of doors and windows, and the protective film on the surface of doors and windows should not have any scratches or scratches. 　
2. The coloring surfaces of adjacent components on doors and windows should not have obvious color difference. 　
3. The surface of doors and windows should not have aluminum scraps, burrs, oil spots or other stains; there should be no overflowing adhesive at the assembly connection; there should not be too many nail holes exposed, affecting the appearance.

Second, the smaller the product size deviation, the better
　　Aluminum alloy door and window products will have a qualified range of dimensional deviation, the smallest dimensional deviation is better. Out of scope, it is a non-qualified product. For example, there are standards stipulating that the width and height of the slot of the door and window frame should be 2000mm, and the allowable deviation range is 1.0mm; the verticality of the front and side of the door and window frame (including the splint) is 2000mm, and the allowable deviation range is 2.0 mm, etc.

Third, the material needs to meet the requirements of 5 aspects
Aluminum alloy doors and windows products have five major requirements in terms of materials: 　
1. Thickness: There are 75 series, 88 series, 103 series, and 120 series of aluminum alloy sliding doors (the number of series represents the thickness of the door frame in millimeters). 88 series can be used for aluminum alloy sliding doors inside the house. Aluminum alloy sliding windows are available in 50 series, 55 series, 70 series, 76 series, 118 series, 130 series, etc., and should be determined according to the size of the window hole and the local wind pressure value. Among them, the aluminum alloy sliding window used as a closed balcony should not be less than 55 series.　
2. Strength: The tensile strength should reach 157 Newtons per square millimeter, and the yield strength should reach 108 Newtons per square millimeter. When buying, you can use your hand to bend the profile moderately, and it is very good to restore the shape after releasing your hand.　
3. Flatness: When checking the surface of aluminum alloy profiles, there should be no dents or bulges.
4. Glossiness: Aluminum alloy doors and windows should avoid buying profiles with open bubbles (white spots) and slag (black spots) on the surface, as well as obvious defects such as cracks, burrs, and peeling.　
5. Oxidation degree: The thickness of the oxide film should reach 10 microns. When buying, you can swipe on the surface of the profile to see if the oxide film on the surface can be wiped off.

Fourth,The components of aluminum alloy doors and windows are firmly connected
In terms of components, the connection of aluminum alloy doors and windows should be firm, and Rongfa doors and windows also have advantages in this regard.