Alu color roofing sheet alloy 3003 3004 is easy to process and has good rust resistance, color paint can be rolled on the surface of the original aluminum to make various decorative roof panels. The main grades of aluminum roofing sheet commonly used in 3000 series aluminum alloys are 3003 aluminum sheet, 3004 aluminum sheet, 3104 aluminum sheet and 3105 aluminum sheet. Color coated aluminum sheet 3003 can also be bent by a tile press to make roof color aluminum corrugated tile, which are light and durable, and have a longer life than steel.
Due to the particularity of the roof system, it has special requirements for the substrate sheet and coating. The first is the aluminum substrate. The aluminum substrate alu color roofing sheet is required to have high wind pressure resistance and good bending performance. At present, aluminum-manganese-magnesium alloys are commonly used in the market. Because aluminum-manganese-magnesium alloys have good tensile strength, respectively is 1.5-2 times higher than ordinary 1100 alloy aluminum plates, and the aluminum-manganese-magnesium alloy aluminum roofing sheet have good ductility, which is conducive to subsequent processing and forming of various shapes.
The second is coatings, which require good weather resistance to prevent the pulverization of sunlight and ultraviolet rays and the oxidation and corrosion of oxygen and water vapor in the atmosphere. Therefore, PVDF coatings and polyvinylidene fluoride are currently used in alu color roofing sheet. Because its molecular structure is quite stable, it has good resistance to radiation aging. Also, due to its organic polymer characteristics, it is not easy to be oxidized by oxygen and water vapor in the air. Generally, if it is under certain film thickness conditions, the polyvinylidene fluoride coating can guarantee no deterioration for more than 20 years, which just meets the needs of exterior roofing system.