Section 15 BASE METALS AND ARTICLES OF BASE METAL 74 COPPER AND ARTICLES THEREOF 74 10 COPPER FOIL (WHETHER OR NOT PRINTED OR BACKED WITH PAPER, PAPERBOARD, 74 10 21 COPPER FOIL OF REFINED COPPER, BACKED, =< 0.15MM Commodity Code Description 74 10 21 00 COPPER FOIL OF REFINED COPPER, BACKED, =< 0.15MM