Are there any standards for the quality of aluminum coil?

Yes, there are several standards that define the quality of aluminum coil. These include ASTM B209, which specifies requirements for aluminum and aluminum alloy flat sheet, coil, and plate for general usage. ASTM B210 covers aluminum and aluminum alloy sheet and plate for heat-treating. Additionally, EN 485 is a European standard that specifies the requirements for aluminum and aluminum alloy cold-rolled sheets, strips, and plates. These standards outline dimensions, chemical composition, mechanical properties, and other quality aspects to ensure the material meets industry requirements.