¿Cómo juzgar la calidad de la maquinaria para puertas y ventanas de aluminio?
23 Jun, 20211. From the point of view of materials, the thickness, strength and oxide film of high-quality aluminum door and window machinery should meet relevant standards. The wall thickness should be greater than 1.2 mm, the tensile strength should reach 157 Newtons per square millimeter, the yield strength should reach 108 Newtons per square millimeter, and the oxide film thickness should reach 10 microns. If it does not meet the above standards, it is a low-quality aluminum alloy door and window equip......