Below is a list of Aluminum 1100 manufacturers from Monterey Park, California. Aluminum 1100 is soft, low strength and, at 99.6% aluminum composition, is among the purest aluminum alloys. Copper, iron, magnesium, manganese, silicon, titanium, vanadium and zinc comprise the remaining 0.4%. It cannot be hardened by heat treatment but is very wieldable and formable.