1XXX represents more than 99% pure aluminum series, such as 1050 and 1100
2XXX stands for aluminum-copper alloy series, such as 2014
3XXX indicates the aluminium-manganese alloy series, such as 3003
4XXX indicates an aluminum-silicon alloy series, such as 4032
5XXX indicates the aluminum-magnesium alloy series, such as 5052
6XXX indicates aluminum-magnesium-silicon alloy series, such as 6061 and 6063
7XXX stands for aluminum-zinc alloy series such as 7001
8XXX indicates an alloy system other than the above