Jiangsu Aluminum Profiles Wholesale Factory Quotation _ Which Supplier is the Best? [Suzhou Brilliance Metal Materials Co., Ltd.] Points to Note When Choosing Aluminum Profiles: 1. Check the product's factory certificate of conformity, paying attention to the production date, specifications, technical conditions, execution standards, company name, and production license number. 2. Carefully inspect the surface condition of the product; it should have bright colors, good luster, and no obvious scratches, bubbles, or other defects on the surface. 3. Always pay attention to the wall thickness of the product; the thickness of door and window materials should not be less than 1.2mm. 4. Note the thickness of the product's surface coating; the film thickness of anodized products should not be less than 10μm, electro-phoresis coated products should not be less than 17μm, powder coating thickness should not exceed 40-120μm, and fluorocarbon paint spray products should have more than two coatings, not less than 30μm. 5. Coastal area users should choose products with good corrosion resistance, such as electro-phoresis coated, powder coated, or fluorocarbon coated aluminum profiles.