Section 15 Base metals and articles of base metal 81 Other base metals; cements; articles thereof 81 05 Cobalt mattes and other intermediate products of cobalt metallurgy; cobalt and articles thereof, including waste and scrap Commodity Code Description 81 05 20 - Cobalt mattes and other intermediate products of cobalt metallurgy; unwrought cobalt; powders 81 05 30 - Waste and scrap 81 05 90 - Other