Can you bend aluminum plate sheet 5mm? Yes, and many alloys of aluminum plate can be bent if you would like, for the bending process has little to do with quality of a plate.
Theoretically, aluminum sheet of any thickness can be bent, and aluminum plate sheet 5mm belongs to a thick type of plates. Of course, the bending effect is related to state of a plate. The state is divided into full hard, semi-hard, soft state (usually soft state called O state). The hard bending effect is basically not good (the aluminum plate state is H18, H19, H38, etc. are all hard). The aluminum plate in the semi-hard state can basically be bent (H24 is semi-hard), and the O-state bending is definitely no problem, but because it is too soft, basically aluminum plates of this kind of state are less frequently bent.
The aluminum plate bend effect has a lot to do with the plate’s alloy series, too. The hardness of pure aluminum (1100, 1050, 1060, etc.) is not good, the only better one is 1100 H26 for bending. The hardness of the alloy aluminum is better, and it can be used in semi-hard state such as 3003, 3005, 5052.
For the specific situation, it is recommended to confirm the sample. If the hardness is too high, especially in the T6 state, it should be bent. Mould aluminum plates are usually of T6 state. Unless you heat it and fold it again, the difference between the aluminum plate and the poor aluminum plate is the oxidation performance. There are differences in tolerance, surface effect, crystal precision and uniform stability, and the bending effect alone is not much different. If the aluminum surface is painted, the quality is not too good. It is also a waste of good use. It is recommended to use 3003-H26, 3005H24 or 5052H34.