First of all, we must distinguish between steel doors and windows and calcium plastic doors and windows. Can be distinguished by the following two criteria. The first is to see whether the plastic profiles for assembling steel doors and windows fully meet the requirements of the national standard GB8814-88 “PVC Profiles for Doors and Windows†and the second is to look at the production process and product structure. The steel doors and windows are reinforced with metal aggregates, and all processes (cutting, cutting, welding, clearing, cutting, and assembly) realize mechanized flow operations. The calcium plastic window has no metal aggregate reinforcement, and the processing methods are completely different. If it is a calcium plastic window that has been installed on a building, it is easy to judge from the surface signs of premature aging such as discoloration, deformation, embrittlement, sludge, and powdering. Before selecting a unit of steel doors and windows, you must first obtain a quality inspection report for the plastic doors and windows, and check its four main indicators, namely hardness (HRR), low temperature drop hammer impact test, high and low temperature sleet change rate (the above three According to the provisions of GB8814-89 and the angular strength test (according to GB17793-89), whether the indicators meet the requirements. The above four indicators can all reflect the product quality of the steel doors and windows, and the products that are not processed according to the standard are not easy to meet the standards. In addition, these indicators are also more intuitive, and ordinary consumers can read it. Secondly, we must observe the smoothness of the steel doors and windows surface, whether there are obvious scratches, whether the geometric dimensions are stable, see if there are cracks in the welding corners and so on. Plastic window and window selection The choice of window type should be based on different regions, different climatic conditions to choose the appropriate model of steel doors and windows. For example, in the cold regions of northeast China, 50-60 type multi-chamber flat open double glass windows can be used. Because of the low temperature in cold regions, multi-chamber profile and double glass windows can enhance the sealing performance and reduce the thermal conductivity, thereby satisfying Insulation requirements. In the area south of the Great Wall and north of the Yangtze River, 60-85 series sliding windows are suitable. Because the area does not require thermal insulation as strictly as in the northeast. Jiangnan region should choose sliding window with small section profile and good watertight performance. In the northwest region, due to large wind and sand, there is a large temperature difference between day and night, so it is appropriate to use the 80-85 series double glass sliding window. The advantages and disadvantages of aluminum alloy doors and windows A look at the materials. High-quality aluminum alloy doors and windows used in aluminum, thickness, strength and oxide film, etc., should comply with relevant national standards, wall thickness should be more than 1.2 mm, tensile strength of 157 newtons per square meter mm, yield strength to achieve each Square millimeters 108 Newtons, oxide film thickness should reach 10 microns. If it fails to meet the above criteria, inferior aluminum alloy doors and windows cannot be used. Second, see processing. High-quality aluminum alloy doors and windows, fine processing, installation stress, good sealing performance, switch freely. Inferior quality aluminum alloy doors and windows, blind selection of aluminum profiles and specifications, rough processing, and saw cutting instead of milling, not installed as required, poor sealing performance, switches are not comfortable, not only leakage of air leakage and glass burst phenomenon, but also To strong winds and external forces, it is easy to scrape or drop the push-pull part or the glass, destroying things and hurting people. Three to see the price. Under normal circumstances, high-quality aluminum alloy doors and windows due to high production costs, the price is about 30% higher than inferior aluminum alloy doors and windows. Some aluminum alloy doors and windows made of aluminum profiles with a wall thickness of only 0.6-0.8 mm have much lower tensile strength and yield strength than the relevant national standards and are not safe to use. In addition, there are many self-employed aluminum alloy doors and windows, and they do not understand the structural characteristics and performance of aluminum alloy doors and windows. In order to reduce the cost of cutting corners, shoddy products, the hidden danger of the product is generally not suitable. It is best to use the products of regular aluminum alloy door and window manufacturers. Windows and doors entrance decoration window aluminum alloy glass door price craft glass door 125mm (5 Inch) Depressed-Center Grinding Disc B&H TOOLS CO., LTD. , https://www.bandhtools.com
How to judge the quality of concealed works in home decoration. However, these problems may not be exposed during the acceptance of the project, but how to use steel doors and windows for renovation?