HTS Heading/Article Subheading description Base Rate Staging Category I. CHEMICAL ELEMENTS 2801 Fluorine, chlorine, bromine and iodine: 28011000 -Chlorine Free E 28012000 -Iodine Free E 280130 -Fluorine; bromine: 28013010 --Fluorine 3.7% A 28013020 --Bromine 5.5% A 28020000 Sulfur, sublimed or precipitated; colloidal sulfur Free E Carbon (carbon blacks and other forms of carbon not 28030000 elsewhere specified or included) Free E 2804 Hydrogen, rare gases and other nonmetals: 28041000 -Hydrogen 3.7% A -Rare gases: 28042100 --Argon 3.7% A 28042900 --Other 3.7% A 28043000 -Nitrogen 3.7% A 28044000 -Oxygen 3.7% A 28045000 -Boron; tellurium Free E -Silicon: --Containing by weight not less than 99.99 percent of 28046100 silicon Free E 280469 --Other: ---Containing by weight less than 99.99 percent but not 28046910 less than 99 percent of silicon 5.3% B 28046950 ---Other 5.5% B 28047000 -Phosphorus Free E 28048000 -Arsenic Free E 28049000 -Selenium Free E Alkali or alkaline-earth metals; rare-earth metals, scandium and yttrium, whether or not intermixed or 2805 interalloyed; mercury: -Alkali metals: 28051100 --Sodium 5.3% B 28051900 --Other 5.5% B -Alkaline-earth metals: 28052100 --Calcium 3% A 280522 --Strontium and barium: 28052210 ---Strontium 3.7% A 28052220 ---Barium Free E -Rare-earth metals, scandium and yttrium, whether or 28053000 not intermixed or interalloyed 5% A 28054000 -Mercury 1.7% A II. INORGANIC ACIDS AND INORGANIC OXYGEN COMPOUNDS OF NONMETALS Hydrogen chloride (Hydrochloric acid); chlorosulfuric 2806 acid: 28061000 -Hydrogen chloride (Hydrochloric acid) Free E 28062000 -Chlorosulfuric acid 4.2% A 28070000 Sulfuric acid; oleum Free E 28080000 Nitric acid; sulfonitric acids Free E Diphosphorus pentaoxide; phosphoric acid and 2809 polyphosphoric acids: 28091000 -Diphosphorus pentaoxide Free E 28092000 -Phosphoric acid and polyphosphoric acids Free E 28100000 Oxides of boron; boric acids 1.5% A Other inorganic acids and other inorganic oxygen 2811 compounds of nonmetals: --Other inorganic acids: 28111100 --Hydrogen fluoride (Hydrofluoric acid) Free E 281119 --Other: 28111910 ---Arsenic acid 2.3% A 28111930 ---Hydrobromic acid Free E 28111960 ---Other 4.2% A -Other inorganic oxygen compounds of nonmetals: 28112100 --Carbon dioxide 3.7% A 281122 --Silicon dioxide: 28112210 ---Synthetic silica gel 3.7% A 28112250 ---Other Free E 28112300 --Sulfur dioxide 4.2% A 281129 --Other: 28112910 ---Arsenic trioxide Free E 28112920 ---Selenium dioxide Free E 28112950 ---Other 3.7% A III. HALOGEN OR SULFUR COMPOUNDS OF NONMETALS 2812 Halides and halide oxides of nonmetals: 281210 -Chlorides and chloride oxides: 28121010 --Phosphorus pentachloride Free E 28121050 --Other 3.7% A 28129000 -Other 3.7% A Sulfides of nonmetals; commercial phosphorus 2813 trisulfide: 28131000 -Carbon disulfide 3.7% A 281390 -Other: 28139010 --Of arsenic Free E 28139020 --Of phosphorus Free E 28139050 --Other 3.7% A IV. INORGANIC BASES AND OXIDES, HYDROXIDES AND PEROXIDES OF METALS 2814 Ammonia, anhydrous or in aqueous solution: 28141000 -Anhydrous ammonia Free E 28142000 -Ammonia in aqueous solution Free E Sodium hydroxide (Caustic soda); potassium hydroxide 2815 (Caustic potash); peroxides of sodium or potassium: -Sodium hydroxide (Caustic soda): 28151100 --Solid Free E 28151200 --In aqueous solution (Soda lye or liquid soda) Free E 28152000 -Potassium hydroxide (Caustic potash) Free E 28153000 -Peroxides of sodium or potassium 3.7% A Hydroxide and peroxide of magnesium; oxides, 2816 hydroxides and peroxides, of strontium or barium: 28161000 -Hydroxide and peroxide of magnesium 3.1% A 28162000 -Oxide, hydroxide and peroxide of strontium 4.2% A 28163000 -Oxide, hydroxide and peroxide of barium 20% A 28170000 Zinc oxide; zinc peroxide Free E Artificial corundum, whether or not chemically defined; 2818 aluminum oxide; aluminum hydroxide: 281810 -Artificial corundum, whether or not chemically defined: 28181010 --Crude Free E 28181020 --In grains, or ground, pulverized or refined 1.3% A 28182000 -Aluminum oxide, other than artificial corundum Free E 28183000 -Aluminum hydroxide Free E 2819 Chromium oxides and hydroxides: 28191000 -Chromium trioxide 3.7% A 28199000 -Other 3.7% A 2820 Manganese oxides: 28201000 -Manganese dioxide 4.7% A 28209000 -Other 4.7% A Iron oxides and hydroxides; earth colors containing 70 percent or more by weight of combined iron evaluated 2821 as Fe2O3 (ferric oxide): 28211000 -Iron oxides and hydroxides 3.7% A 28212000 -Earth colors 5.5% B Cobalt oxides and hydroxides; commercial cobalt 28220000 oxides 0.1% A 28230000 Titanium oxides 5.5% B 2824 Lead oxides; red lead and orange lead: 28241000 -Lead monoxide (litharge, massicot) 3% A 28242000 -Red lead and orange lead 3.4% A 282490 -Other: 28249010 --Lead suboxide (leady litharge) 9.3% B 28249050 --Other 4.8% A Hydrazine and hydroxylamine and their inorganic salts; other inorganic bases; other metal oxides, hydroxides 2825 and peroxides: 28251000 -Hydrazine and hydroxylamine and their inorganic salts 3.7% A 28252000 -Lithium oxide and hydroxide 3.7% A 28253000 -Vanadium oxides and hydroxides 9.7% B 28254000 -Nickel oxides and hydroxides Free E 282550 -Copper oxides and hydroxides: 28255010 --Cupric oxide 4.3% A 28255020 --Cuprous oxide 5% A 28255030 --Copper hydroxides 3.9% A 28256000 -Germanium oxides and zirconium dioxide 3.7% A 28257000 -Molybdenum oxides and hydroxides 3.2% A 28258000 -Antimony oxides Free E 282590 -Other: 28259010 --Beryllium oxide and hydroxide 3.7% A 28259015 --Niobium oxide 3.7% A 28259020 --Tin oxides 4.2% A 28259030 --Tungsten oxides 5.5% B 28259045 --Mercuric oxide Free E 28259075 --Cadmium oxide Free E 28259090 --Other 3.7% A V. SALTS AND PEROXYSALTS, OF INORGANIC ACIDS AND METALS Fluorides; fluorosilicates, fluoroaluminates and other 2826 complex fluorine salts: -Fluorides: 282611 --Of ammonium or of sodium: 28261110 ---Of ammonium 3.1% A 28261150 ---Of sodium 3.7% A 28261200 --Of aluminum Free E 28261900 --Other 3.9% A 28262000 -Fluorosilicates of sodium or of potassium 4.1% A 28263000 -Sodium hexafluoroaluminate (Synthetic cryolite) Free E 28269000 -Other 3.1% A Chlorides, chloride oxides and chloride hydroxides; bromides and bromide oxides; iodides and iodide 2827 oxides: 28271000 -Ammonium chloride 2.9% A 28272000 -Calcium chloride Free E -Other chlorides: 28273100 --Of magnesium 1.5% A 28273200 --Of aluminum Free E 28273300 --Of iron 3.7% A 28273400 --Of cobalt 4.2% A 28273500 --Of nickel 3.7% A 28273600 --Of zinc 1.6% A 28273800 --Of barium 4.2% A 282739 --Other: 28273910 ---Of vanadium 9.7% B 28273920 ---Of mercury 5.1% B 28273925 ---Of tin 4.2% A 28273930 ---Of titanium 4.9% A 28273940 ---Of tungsten 5.5% B 28273950 ---Other 3.7% A -Chloride oxides and chloride hydroxides: 28274100 --Of copper 3.9% A 282749 --Other: 28274910 ---Of vanadium 9.7% B 28274950 ---Other 5.5% B -Bromides and bromide oxides: 28275100 --Bromides of sodium or of potassium: Free E 282759 --Other: 28275925 ---Of ammonium, of calcium or of zinc Free E 28275950 ---Other 3.6% A 282760 -Iodides and iodide oxides: 28276010 --Of calcium or of copper Free E 28276020 --Of potassium 2.8% A 28276050 --Other 4.2% A Hypochlorites; commercial calcium hypochlorite; 2828 chlorites; hypobromites: -Commercial calcium hypochlorite and other calcium 28281000 hypochlorites 2.4% A 28289000 -Other 3.7% A Chlorates and perchlorates; bromates and 2829 perbromates; iodates and periodates: -Chlorates: 28291100 --Of sodium Free E 28291900 --Other 3.3% A 282990 -Other: 28299005 --Potassium bromate Free E 28299025 --Sodium bromate Free E --Other: 28299040 ---Of potassium 3.1% A 28299060 ---Other 3.7% A 2830 Sulfides; polysulfides: 28301000 -Sodium sulfides 3.7% A 283020 -Zinc sulfide: --Luminescent grade having a purity of 99.99 percent 28302010 or more by weight Free E 28302020 --Other 2.8% A 28303000 -Cadmium sulfide 3.1% A 28309000 -Other 3% A 2831 Dithionites and sulfoxylates: 283110 -Of sodium: 28311010 --Sodium formaldehyde sulfoxylate Free E 28311050 --Other 9.7% C 28319000 -Other 10.3% C 2832 Sulfites; thiosulfates: 28321000 -Sodium sulfites 1.5% A 28322000 -Other sulfites 3.1% A 283230 -Thiosulfates: 28323010 --Sodium thiosulfate 1.5% A 28323050 --Other 3.1% A 2833 Sulfates; alums; peroxosulfates (persulfates): -Sodium sulfates: 283311 --Disodium sulfate: 28331110 ---Salt cake Free E 28331150 ---Other 0.4% A 28331900 --Other Free E -Other sulfates: 28332100 --Of magnesium 3.7% A 28332200 --Of aluminum Free E 28332300 --Of chromium 3.7% A 28332400 --Of nickel 3.2% A 28332500 --Of copper 1.4% A 28332600 --Of zinc 1.6% A 28332700 --Of barium 0.6% A 283329 --Other: 28332910 ---Of cobalt 1.4% A 28332920 ---Of iron Free E 28332930 ---Of vanadium 9.7% B 28332950 ---Other 3.7% A 28333000 -Alums 1.6% A 283340 -Peroxosulfates (persulfates): 28334020 --Of sodium 3.7% A 28334060 --Other 3.1% A 2834 Nitrites; nitrates: 283410 -Nitrites: 28341010 --Of sodium 5.5% B 28341050 --Other 3.1% A -Nitrates: 28342100 --Of potassium Free E 28342200 --Of bismuth 5.5% B 283429 --Other: 28342910 ---Of calcium Free E 28342920 ---Of strontium 4.2% A 28342950 ---Other 3.5% A Phosphinates (hypophosphites), phosphonates 2835 (phosphites), phosphates and polyphosphates: -Phosphinates (hypophosphites) and phosphonates 28351000 (phosphites) 3.1% A -Phosphates: 28352200 --Of mono- or disodium 1.4% A 28352300 --Of trisodium 2.2% A 28352400 --Of potassium 3.1% A --Calcium hydrogenorthophosphate ("Dicalcium 28352500 phosphate") Free E 28352600 --Other phosphates of calcium Free E 283529 --Other: 28352910 ---Of aluminum Free