1. As used in this act:
"Scrap metal" means used, discarded, or previously owned items that consist predominantly of ferrous metals, aluminum, brass, copper, lead, chromium, tin, nickel, or alloys, and shall include a used catalytic converter, in whole or in part, if the used catalytic converter is not attached to a motor vehicle.
"Scrap metal business" means a commercial establishment which, as one of its principal business purposes, purchases scrap metal for purposes of resale or processing.