What do I do if a seller substitutes a lower grade of aluminium after we'd agreed on 6063 extrusions specifically?
Short answer: Document the substitution with photos and, if possible, a composition test showing the actual alloy received, then raise it with the seller referencing the specific agreed grade before accepting delivery as final — a substitution like this is a material breach of what was agreed, not a minor variance you're expected to just accept.
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Browse Listings →Why naming a specific alloy matters
Agreeing on “aluminium” versus agreeing on “6063 extrusions” specifically are very different commitments — 6063 is a defined, known alloy with specific properties, and substituting a different, likely lower-value alloy without disclosure isn’t a rounding-error variance, it’s delivering something other than what was purchased.
How to confirm it’s actually a substitution
If you have any doubt whether the material is genuinely different from what was agreed, a quick XRF test settles it — comparing the actual composition against 6063’s known specification either confirms the substitution or clears up a misunderstanding.
What resolution looks like
Once confirmed, you have grounds to request a price adjustment reflecting the actual, likely lower-value, alloy delivered, a partial rejection of the shipment, or replacement with correctly-specified material — which option makes sense depends on how much of the load is affected and what you need the material for.
How ScrapTrade Makes This Easier
Having the specific agreed alloy grade documented in a ScrapTrade listing or message thread gives you a clear reference point if a seller later claims the substitution was within normal tolerance.
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