Prepainted Wood Aluminum For Aluminum Ceiling Sheet

To determine whether a color-coated sheet meets quality standards, the following inspections can be performed: Simple Tests for Coating Performance Pencil Hardness Test: Lightly scratch the surface of the sheet at a 45-degree angle using an HB pencil; the sheet is considered acceptable if no visible scratches appear. Adhesion Test:Use a utility knife to cut through the coating, creating a cross-hatch grid pattern; apply transparent adhesive tape over the grid and quickly peel it off. The sheet is considered acceptable if no coating peels away. Additional Requirements for Outdoor Products: Manufacturers must explicitly label the product as featuring a fluorocarbon (PVDF) coating (with a fluorine content of ≥70%). Standard polyester (PE) coatings are insufficient to meet the long-term weather resistance requirements for outdoor applications. Step Four: Verify Third-Party Test Reports Request that the manufacturer provide third-party test reports corresponding to the specific production batch in question. Pay particular attention to verifying the results of two key tests: Neutral Salt Spray Resistance Test: For outdoor products, the requirement is that no corrosion occurs after ≥1000 hours of exposure. Xenon Lamp Accelerated Aging Test: The requirement is that the discoloration rating remains no lower than Grade 2 after 1000 hours of testing. The product is considered to meet quality standards only if it satisfies both of these criteria.