Cast aluminum - usually pots, pans, baseball bats and some engine
parts. 2% foreign matter allowed.

Old sheet - thin aluminum like siding with foreign matter, pet food
cans (no labels). Maximum of 2% foreign matter allowed.

Painted clips - thin aluminum like siding without foreign matter

6061 extrusion usually thick aluminum of various shapes, no foreign
matter allowed.

6063 extrusion usually window frames without foreign matter.

EC wire is clean aluminum wire.

ACSR  is Aluminum Cable Steel Reinforced wire.  Also contains
insulated aluminum wire.

Please ask about items not listed.
Types of Aluminum