Unalloyed tin (800110) must meet a minimum tin purity threshold as defined in the HS nomenclature notes; any cast tin product containing other metals above that threshold is classified as a tin alloy (800120). Solder alloys and bearing metals are common examples that fall under 800120.

Unwrought tin (8001) covers primary and secondary metal that has been cast or refined into ingot or similar forms suitable for further working, retaining the character of a metal product. Tin waste and scrap (8002) covers recovered material — offcuts, used articles, and process residues — destined for remelting. The distinction affects both duty treatment and documentation requirements.