In 1808, aluminum oxide was electrolyzed in the laboratory and became aluminum. In 1884, it was used as a building material on the top of Washington Monument; The aluminum alloy materials synthesized by adding various metal elements to aluminum have been widely used in various links in the construction industry. The thickness of common aluminum alloy plates: generally 0.8-1.2mm for advanced metal roof (and curtain wall) systems (while it is generally ≥ 2.5mm for traditional systems)