[China Glass Network] 1. Manufacturers with formal or production licenses shall indicate the product logo on the obvious parts of their door and window products, including: manufacturer name or trademark, product name, product model or mark, date of manufacture or serial number. . There should be obvious “moisture-proofâ€, “careful and light†and “upward†words and signs on the package. 2, the quality of the door and window surface quality directly affects the decorative effect of the entire wall after installation. Pay attention to the following aspects when checking the surface quality of doors and windows: 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. The flatness of the joints of the adjacent members of the door and window (horizontal and vertical) and the rules of the angle of formation. Whether the door and window glass sealant is uniform and smooth, and there are no leaks or breaks to ensure the sealing effect. (Of course, some seals are used for sealing. This depends on the material quality of the strip. At present, the anti-aging and sealing effect is better than the EPDM strip) Door and window glass is a key component. Intuitively, of course, there are no cracks, scratches, bubbles, etc. These can be seen from the front with the naked eye, while observing from the side through the reflective effect of the glass. If the insulating glass, please pay attention to whether the hollow spacer is intact (this is usually not easy to see with the naked eye, but can be detected by small tests, or can be seen when the weather changes, especially the indoor and outdoor temperature difference is large, the sealing spacer When it is destroyed, it will form fog in the hollow cavity, and the larger the temperature difference between inside and outside is, the more obvious it is) 3, the door and window frame size deviation is small, under normal circumstances, the manufacturer will have construction drawings, users can take the measurement and comparison. 4. The connection between the door and window components should be firm, and the connection part should be sealed and waterproofed with corrosion-resistant filling material. (Accessories are important, it is recommended that buyers choose original accessories!) 5, look at the material, there are mainly six aspects of the material can be referenced: Thickness: There are 70 series and 90 series of aluminum alloy sliding doors. The 70 series of aluminum sliding doors in the house can be used. The number of series indicates the number of millimeters of the thickness of the door frame. Aluminum alloy sliding windows are available in 55 series, 60 series, 70 series and 90 series. The selection of the series should be based on the size of the window and the local wind pressure. The aluminum alloy sliding window used as a closed balcony should be no less than the 70 series. Strength: The tensile strength should be 157 Newtons per square meter and the yield strength should be 108 Newtons per square millimeter. When purchasing, you can use your hand to bend the profile moderately, and you should be able to recover after loosening your hand. Chromaticity: The color of the same aluminum alloy profile should be consistent. If the color difference is obvious, it is not suitable for purchase. Flatness: Check the surface of the aluminum alloy profile without any depression or bulging. Gloss: 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. 6. Oxidation degree: The thickness of the oxide film should reach 10 microns. When you purchase, you can scratch the surface of the profile to see if the oxide film on the surface can be wiped off. Rubber Yarn,Latex Covered Yarn,Latex Yarn,Thread Weaving Elastic Shaoxing Shiffon Textile Co., Ltd , http://www.shiffontex.com