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Module 5 of 9 · A4 · Precursors in the aluminium value chain

6.Several suppliers, several periods

  • Same supplier, several periods: weighted average over those periods.
  • Several suppliers, same CN code: weighted average across them, by default.
  • Proven segregation: if a process used only one supplier's metal, use that supplier's value for it.
  • Precursor period: by default the production year of your product, or the actual period if you can prove it.

Sources: MA Art 13, 14(1)-(3), Annex III B p.72; QA 4.10.