Aluminium cast is a dirtier grade of aluminium formed by pouring molten alloy into a mould. It’s commonly found in older engine blocks, transmission housings, lawnmower bodies, barbecue frames, and alloy wheels. Cast aluminium typically contains other metals (silicon, magnesium, zinc) mixed into the alloy, which reduces its melt value compared to clean extrusion. Some cast items also have steel bolts, rubber bushings, or oil contamination that must be removed. At endless metals, we accept cast aluminium at both Auckland yards. Removing steel attachments (use the magnet test) will bump your material into a higher grade.