Regular or licensed production enterprises shall indicate product marks on the obvious parts of their aluminum alloy products, including the name or trademark of the production enterprise, product name, product model or mark, production date or number. There should be obvious words and signs such as "moistureproof", "handle with care" and "upward" on the packing box.
Second, the surface quality.
The surface quality of doors and windows directly affects the decorative effect of the whole wall after installation. Check the surface quality of doors and windows should pay attention to the following aspects:
A, doors and windows decoration surface should not have obvious damage, which means that the protective film on the surface of doors and windows should not have scratches.
B, doors and windows on the color surface of adjacent components should not have obvious color difference.
C there should be no aluminium scrap, burr, oil stain or other stains on the surfaces of doors and windows, and there should be no overflowing adhesive at the assembly joints.
D, doors and windows adjacent components (horizontal and vertical) joint smoothness and angle regularity.
E, door and window glass sealant uniform, smooth, there is no leakage or breakpoint, to ensure the sealing effect. (Of course, some of them are sealed with sealing tape, which depends on the material of the tape. At present, EPDM tape has good anti-aging and sealing effect. ) 。
F, door and window glass is a key component. The quality of glass largely determines the quality of doors and windows. Intuitively, of course, there are no cracks, scratches, bubbles and other defects, which can be seen with the naked eye from the front and observed from the side through the glass reflection effect. If insulating glass is used, you should also pay attention to whether the hollow partition is intact (this situation is usually not easy to see with naked eyes, but it can be detected by small tests, or it can be seen when the weather changes, especially when the indoor and outdoor temperature difference is large and the sealed partition is damaged, fog will form in the hollow cavity, and the greater the indoor and outdoor temperature difference, the more obvious it will be).
Third, the size deviation.
The smaller the dimensional deviation of aluminum alloy door and window frames, the better. Under normal circumstances, manufacturers will have construction drawings, and users can measure and compare them with measuring tools themselves.
Four, aluminum alloy door and window components.
Aluminum alloy door and window components should be firmly connected, and the connection parts should be sealed and waterproof with corrosion-resistant filling materials.
Fifth, look at the material.
As far as materials are concerned, there are six main aspects for reference:
1. Thickness: There are 70 series and 90 series aluminum alloy sliding doors, and 70 series aluminum alloy sliding doors can be used in houses. The serial number indicates the millimeter of the structural dimension of the door frame thickness. There are four kinds of aluminum alloy sliding windows: 55 series, 60 series, 70 series and 90 series. Series selection should be based on window size and local wind pressure value. Aluminum alloy sliding windows used as closed balconies should not be less than 70 series.
2. Strength: the tensile strength should reach 157 Newton per square millimeter, and the yield strength should reach 108 Newton per square millimeter. When buying, you can bend the profile moderately by hand, and it should be able to recover after letting go.
3. Chromaticity: The same aluminum alloy profile should have the same color. If the color difference is obvious, it is not suitable for purchase.
4. Smoothness: Check the surface of aluminum alloy profile, and there should be no depression or protrusion.
5. Glossy: For aluminum alloy doors and windows, avoid buying profiles with obvious defects such as bubbles (white spots), dusting (black spots), cracks, burrs and peeling.
6. Oxidation degree: the thickness of oxide film should reach 10 micron. When buying, you can scrape the surface of the profile to see if the oxide film on its surface can be wiped off.
In modern society, more and more plastic steel doors and windows are used. Plastic steel doors and windows are increasingly favored by people because of their strong corrosion resistance, good water tightness and heat insulation, and simple maintenance. In recent years, the development momentum is extremely rapid, but it is easy to ignore many hidden problems when it develops too fast. And there are many good and poor quality materials on the market. Most people don't know enough about its performance. Without any testing tools, I am not familiar with its performance, especially how to identify the quality of doors and windows in yingtan, and sometimes I am deceived.