At China Aluminum Network, we ensure that the surface of metal doors and windows is clean, smooth, and free from any imperfections such as burrs or rough edges. For steel doors and windows, there should be no welding slag, welding burrs, or hammer marks. The coating, color, galvanized layer, or anti-rust paint must be evenly applied, without corrosion, and there should be no large scratches or dents. Any product with defects like distortion, loose joints, surface damage, or attachment issues must be rejected. To protect the outer surface, a protective film is applied to both the metal and plastic frames of doors and windows. The thickness of the materials used for metal doors, windows, extensions, and handles must meet industry standards to ensure sufficient rigidity. The size of the window sash should match exactly, with an overlap between the sash and frame of at least 2mm. Hinge positions must be accurately aligned, with the upper and lower hinge axes on the same vertical line. The gap on one side of the hinge should be between 0.6mm and 1mm, and not exceed 2mm on the other side. The bottom of the window frame must be fully welded on both sides. Iron foot holes should not be long-round or round-shaped; each window must have a drainage hole at the lower frame, and a water-drawing board should be installed at the top of the waist window. The cross-section of aluminum alloy profiles used for windows and doors must meet design specifications. Generally, the wall thickness should not be less than 1.4mm. For aluminum alloy doors, the profile wall thickness must be at least 2.0mm to ensure structural rigidity. All hardware components, including accessories, must comply with relevant standards and design requirements. It is recommended to use stainless steel, light metals, or other surface-treated materials. The oxide film on aluminum profiles should meet the AAl0 standard or higher, with a firmly bonded coating to ensure durability and aesthetics. In addition, all installation processes must follow strict quality control measures to ensure that every component functions properly and meets safety and performance standards. Regular inspections are conducted to maintain consistency and reliability across all products. This attention to detail helps in delivering high-quality aluminum products that meet international standards and customer expectations. General Use Strain Gauges,Eb Load Cell Transducer,Full Bridge Strain Gauge,For Compression Sensor Zhejiang Nanhua Electronic Technology Co., Ltd , https://www.nhloadcell.com