Scrap classification affects treatment as raw material versus crude input, impacting import and manufacturing characterisation. The document defines scrap as remnants or discarded manufactured pieces used for reprocessing and identifies secondary copper from reclaimed articles, trimmings, sweepings and dross as an important source. It records that brass scrap may arise during manufacture and has an established market, and highlights a classification issue whether imported scrap constitutes copper in a 'crude' form for regulatory treatment, citing Black's flexible definition of 'crude'.