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 22 COPPER FOIL OF COPPER ALLOYS, BACKED, =< 0.15MM Commodity Code Description 74 10 22 00 COPPER FOIL OF COPPER ALLOYS, BACKED, =< 0.15MM