Aluminum oxide film formed on the surface layer of invisible, no aluminum oxide, the self-protection of the aluminum with high corrosion resistance; secondly aluminum substrate surface covered with colored polyester coating, color stability ; coefficient of thermal expansion coefficients of the base layer and the third aluminum cement close Cailv the water system is not in use, resulting in risen and crack, resulting in leakage; while aluminum at temperatures between -45 ° to 260 ° C, strength, the same performance; it can in the cold regions such as northeast China, as the strong sun in southern China, such as resistance to large temperature under changing China's Xinjiang and other inclement weather use; to ensure lasting as new. Cailv the water system of product standards: product quality Cailv the water system requirements refer to "building walls with APCP" GB / T17748-2008, size deviation, thickness deviation, adhesion, impact resistance, acid and alkali resistance, oil resistance, salt spray and other indicators are to meet the requirements. Note: The use of aluminum siding should be used in 5005,3003 aluminum sheet: according to national standards GB / T7748-2008 provisions of the aluminum siding should be consistent with GB / T3380 requirements of rust-proof aluminum, ready to use. Material: 3003 aluminum-manganese; (rust-proof aluminum and manganese can be added to a small amount of grain refinement to improve resistance to stress corrosion performance) coating products: outdoor polyester paint roller coating, roll coating production process. Internal gutters and downspouts are required anti-corrosion coating roll coating advantages: ① three-coat three-bake: primer, topcoat, back coating. (Spraying only once coating, no preservative-backed) ② T≤2. ③ uniform color, no color. ④ can provide 300 hours aging test report (equivalent to approximately 5--6 years). ⑤ chemical resistant: 5% HCL, 24h and 3% NaOH, 24Hh; surface unchanged. ⑥ impact resistance: Bending 2T, surface no peeling, no cracks phenomenon. ⑦ product with PE protective film to prevent the transport, installation scratched.