33390 - Primary nonferrous metals (Miscellaneous)
33391 - Zinc residues & other Zinc smelter products
33392 - Zinc, Refined primary
3339231 - - Refined primary unalloyed zinc slab, excl remelt zinc (incl all ASTM specification zinc) Special high grade
3339234 - - Refined primary unalloyed zinc slab, excl remelt zinc (incl all ASTM specification zinc)
3339237 - - Refined primary unalloyed zinc slab, excl remelt zinc (incl all ASTM specification zinc) Prime western
3339239 - - Refined primary unalloyed zinc slab, excl remelt zinc (incl all ASTM specification zinc) other Grades
3339241 - - Refined primary unalloyed remelt zinc slab (incl all ASTM specification zinc) Special high grade
3339243 - - Refined primary unalloyed remelt zinc slab (incl all ASTM specification zinc) Prime western
3339244 - - Refined primary unalloyed remelt zinc slab (incl all ASTM specification zinc)
3339249 - - Refined primary unalloyed remelt zinc slab (incl all ASTM specification zinc) other Grades
3339251 - - Refined primary zinc-base alloys
3339255 - - Refined primary unalloyed zinc dust (incl all ASTM specification zinc)
3339299 - - Refined primary zinc (Miscellaneous)
33395 - Precious metals & Precious metal alloys
3339525 - - Primary gold & Gold alloys
3339535 - - Primary silver & Silver alloys
3339545 - - Primary platinum & Platinum alloys (incl Platinum-group metals)
3339599 - - Precious metals & Precious metal alloys (Primary smelting - Miscellaneous)
33398 - Miscellaneous primary nonferrous metals (General)
3339801 - - Primary lead smelter products not of Commercial grade, produced for further refining incl Base bullion, Matte, Speiss, etc.
3339805 - - Primary lead & Lead-base alloys
3339833 - - Primary magnesium & Magnesium-base alloys
3339843 - - Primary nickel & Nickel-base alloys
3339863 - - Primary unalloyed tin
3339873 - - Primary unalloyed silicon
3339889 - - Other Primary unrefined nonferrous metals (incl Metal bearing furnace residues & other Metal products)
3339899 - - Other Primary refined nonferrous metals & their alloys (incl Cadmium, Antimony, Cobalt, Molybdenum, Titanium sponge, etc.)
333989X - - Other Primary refined nonferrous metals & their alloys (incl Cadmium, Antimony, Cobalt, Molybdenum, Titanium sponge, etc.)
3339981 - - Chromium, Unalloyed
3339985 - - Silicon, Unalloyed (<99.7% silicon)
3339XX0 - - Primary nonferrous metals (Miscellaneous)
3339XX2 - - Primary nonferrous metals (Miscellaneous - Speciality)