1) The corrosion resistance of aluminum-zinc color-coated sheet is 3 to 5 times that of galvanized color-coated sheet, and the more severe the corrosion, the greater the difference, so in building roofs, aluminum-zinc color-coated sheet AZ150 should be preferred. If the galvanized color-coated sheet is selected, it must not be less than Z275, and its service life is much lower than that of AZ150. Therefore, Australia and other countries clearly stipulate that if galvanized color-coated sheet is used for roofing (wall), Z450 must be used.
2) AZ150 is about 10-20% more expensive than Z275, but its corrosion resistance is more than 3 to 5 times. It can be seen that the aluminum-zinc color-coated sheet has an excellent performance-to-price ratio.