Aluminum alloy 3003 and 3004 aluminium roofing sheet are easy to process and have good anti-rust properties. Color coatings can be rolled on the original aluminum surface to make various decorative roof panels. The main grades of aluminum roof panels commonly used in 3000 series aluminum alloys are 3003 aluminum plate, 3004 aluminum plate, 3104 aluminum plate and 3105 aluminum plate. Color coated aluminum sheet 3003 can also be bent by a brick press to make roof colored aluminum corrugated tiles, which are lightweight and durable, and have a longer lifespan than steel.
Due to the particularity of roofing systems, there are special requirements for substrate sheets and coatings. The first is the aluminum substrate. It is required that the aluminum substrate aluminum color roof sheet has high wind pressure resistance and good bending performance. At present, the most commonly used in the market is aluminum-manganese-magnesium alloy. Because the aluminum-manganese-magnesium alloy has good tensile strength, it is 1.5-2 times that of the ordinary 1100 alloy aluminum plate, and the aluminum-manganese-magnesium alloy coated aluminium roofing sheets has good ductility, which is conducive to subsequent processing and forming various shapes.
The second is the coating, which requires good weather resistance, prevents the chalking of sunlight and ultraviolet rays, and prevents the oxidation and corrosion of oxygen and water vapor in the atmosphere. Therefore, polyvinylidene fluoride coatings and polyvinylidene fluoride are currently used for aluminum color roof panels. Because its molecular structure is quite stable, it has good radiation aging resistance. Also, due to its organic polymer properties, it is not easily oxidized by oxygen and water vapor in the air. Generally, under the condition of certain film thickness, polyvinylidene fluoride coating can be guaranteed not to deteriorate for more than 20 years, which just meets the needs of exterior wall and roof system.
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