Section 15 BASE METALS AND ARTICLES OF BASE METAL 81 Other base metals; cermets; articles thereof 81 09 Zirconium and articles thereof, including waste and scrap. 81 09 91 Containing less than 1 part hafnium to 500 parts zirconium by weight Commodity Code Description 81 09 91 00 Containing less than 1 part hafnium to 500 parts zirconium by weight