The strength of 6063, as extruded, is somewhat higher than that of 3003. It can be precipitation heat-treated to strengths just under 6061 alloy and it can be welded. It is primarily used in extruded shapes for architecture, particularly window frames, door frames, roofs, and sign frames. Application : Foundry Industry Features : High Durability Al Content (%) : 99%, 99.9% Color : Original