The aluminum alloy has been widely used in doors, windows and curtain walls of buildings for many years due to its small specific gravity, easy processing and high mechanical strength.

1. The oxidized aluminum forms a dense oxide film on the outer surface, so that the corrosion resistance is increased, and the melting point is also increased

Heat-insulating curtain wall profiles and insulated door and window profiles must be in the same ageing furnace. The temperature in the furnace is controlled within the range of 180 掳C 卤 3 掳C.