Unwrought forms, waste, scrap, and powders of base metals not elsewhere specified — a catch-all classification that captures commercially significant but less common metals such as bismuth, cadmium, cobalt, and indium in their primary or recovered forms. Classification here turns on whether the metal is specifically enumerated elsewhere in the schedule; importers frequently face reclassification disputes when a material straddles this residual heading and a named-metal provision. Scrap and powder forms may trigger additional documentation requirements related to hazardous-material content or export-control regimes depending on the specific metal involved.

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