A00 is the national standard specification that contains 99.7% aluminum, and higher than this standard is high-purity aluminum.
And there are A0 A1 aluminum ingots below this standard, and they all contain iron and other miscellaneous elements exceeding the standard.
Aluminum ingots are divided into three types: aluminum ingots for remelting, high-purity aluminum ingots and aluminum alloy ingots according to their composition; according to their shape and size, they can be divided into bar ingots, round ingots, slab ingots, T-shaped ingots, etc.

Several common aluminum ingots
Aluminum ingot for remelting-15kg, 20kg (≤99.80%Al):
T-shaped aluminum ingot--500kg, 1000kg (≤99.80%Al):
High-purity aluminum ingots-10kg, 15kg (99.90%~99.999% Al);
Aluminum alloy ingot - 10kg, 15kg (Al--Si, Al--Cu, Al--Mg);
Plate ingot--500~1000kg (for plate making);
Round spindle-30~60kg (for wire drawing).

The raw materials in our daily industry are called aluminum ingots. According to the national standard (GB/T 1196-2008), they should be called "aluminum ingots for remelting", but everyone is used to calling them "aluminum ingots". It is produced by electrolysis using alumina-cryolite. After aluminum ingots enter industrial applications, there are two major categories: cast aluminum alloys and deformed aluminum alloys. Cast aluminum and aluminum alloys are aluminum castings produced by casting methods; deformed aluminum and aluminum alloys are processed aluminum products produced by pressure processing methods: plates, strips, foils, tubes, rods, shapes, wires and forgings. According to the national standard, "remelting aluminum ingots are divided into 8 grades according to chemical composition, which are Al99.90, Al99.85, Al99.70, Al99.60, Al99.50, Al99.00, Al99.7E, Al99. 6E" (Note: The number after Al is the aluminum content).

Some people call "A00" aluminum, which is actually aluminum with a purity of 99.7%, which is called "standard aluminum" in the London market. Everyone knows that my country's technical standards in the 1950s came from the former Soviet Union. "A00" is the Russian brand in the Soviet national standard. "A" is a Russian letter, not English "A", nor is it a Chinese phonetic alphabet. If "A" is in line with international standards, it is more accurate to call "standard aluminum". Standard aluminum is an aluminum ingot containing 99.7% aluminum, which is registered on the London market.