How do I tell the difference between cast and wrought aluminium before selling a mixed load?
Short answer: A magnet won't help — both are non-magnetic. Look at surface finish instead: wrought aluminium (extrusions, sheet, cans) has a smooth, uniform surface from rolling or extruding. Cast aluminium usually has a rougher, slightly porous surface, visible mould seams, and snaps rather than bends when you flex a thin edge.
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List Free →The tests that actually work
Surface texture is the first tell: extruded and rolled aluminium has a smooth, consistent finish, while cast aluminium was poured into a mould and often shows a grainy surface or a visible parting-line seam. The snap test is the second: bend a thin edge or offcut — wrought aluminium tends to bend, cast aluminium is more brittle and cracks.
Why it’s worth sorting
Buyers pay more for wrought aluminium because it’s a predictable, lower-silicon alloy that can go back into higher-value products. Drop off a mixed load without separating and expect it priced at the cast rate — the burden of proof sits with whoever wants the higher price.
How ScrapTrade Makes This Easier
If you’re unsure sorting cast from wrought yourself, ScrapTrade’s verified buyers can assess a photo listing before pickup, so you get a read on the split before committing to one buyer.
Ready to sell or source aluminium scrap without the guesswork? ScrapTrade connects verified buyers and sellers with escrow-protected payments and transparent weighing.
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