Zinc scrap may be subject to EPA hazardous-waste regulations depending on its origin and composition. Importers should verify whether the material qualifies as a hazardous waste under RCRA and obtain any required EPA import notices before shipment.

Zinc dross and ash (oxides and residues from smelting) are classified in the chapter covering slag and ash rather than here. Heading 7902 applies to metallic zinc scrap — pieces retaining the character of the metal — while non-metallic residues fall elsewhere. A licensed customs broker can help determine the correct heading based on the material's metallurgical analysis.