TariffWire

HS chapter 28 tariff rates

Inorganic chemicals: 156 product categories with real US schedule data.

Chapter 28 at a glance

  • Product categories with schedule data: 156
  • Tariff lines across those categories: 356
  • Most common base rates: Free on 55, 3.7% on 35, 5.5% on 11, 3.1% on 9, 5% on 5

Nearby chapters: Chapter 27 - Chapter 29

All codes in chapter 28

CodeBase rateGoods
280110FreeChlorine
280120FreeIodine
2801303.7%Fluorine; bromine:
280200FreeSulfur, sublimed or precipitated; colloidal sulfur
280300FreeCarbon (carbon blacks and other forms of carbon not elsewhere specified or included)
2805115.3%Sodium
2805123%Calcium
2805193.7%Other:
2805305%Rare-earth metals, scandium and yttrium, whether or not intermixed or interalloyed
2805401.7%Mercury
280610FreeHydrogen chloride (Hydrochloric acid)
2806204.2%Chlorosulfuric acid
280700FreeSulfuric acid; oleum
280800FreeNitric acid; sulfonitric acids
280910FreeDiphosphorus pentaoxide
280920FreePhosphoric acid and polyphosphoric acids
2810001.5%Oxides of boron; boric acids
281111FreeHydrogen fluoride (Hydrofluoric acid)
2811124.2%Hydrogen cyanide (hydrocyanic acid)
2811192.3%Other:
2811213.7%Carbon dioxide
2811223.7%Silicon dioxide:
281129FreeOther:
2812113.7%Carbonyl dichloride (phosgene)
2812123.7%Phosphorous oxychloride
2812133.7%Phosphorous trichloride
281214FreePhosphorous pentachloride
2812153.7%Sulfur monochloride
2812163.7%Sulfur dichloride
2812173.7%Thionyl chloride
2812193.7%Other
2812903.7%Other
2813103.7%Carbon disulfide
281390FreeOther:
281410FreeAnhydrous ammonia
281420FreeAmmonia in aqueous solution
281511FreeSolid
281512FreeIn aqueous solution (Soda lye or liquid soda)
281520FreePotassium hydroxide (Caustic potash)
2815303.7%Peroxides of sodium or potassium
2816103.1%Hydroxide and peroxide of magnesium
2816404.2%Oxides, hydroxides and peroxides, of strontium or barium:
281700FreeZinc oxide; zinc peroxide
281810FreeArtificial corundum, whether or not chemically defined:
281820FreeAluminum oxide, other than artificial corundum
281830FreeAluminum hydroxide
2819103.7%Chromium trioxide
2819903.7%Other
2820104.7%Manganese dioxide
2820904.7%Other
2821103.7%Iron oxides and hydroxides
2821205.5%Earth colors
2822000.1%Cobalt oxides and hydroxides; commercial cobalt oxides
2823005.5%Titanium oxides
2824103%Lead monoxide (litharge, massicot)
2824905.5%Other:
2825103.7%Hydrazine and hydroxylamine and their inorganic salts
2825203.7%Lithium oxide and hydroxide
2825305.5%Vanadium oxides and hydroxides
282540FreeNickel oxides and hydroxides
2825504.3%Copper oxides and hydroxides:
2825603.7%Germanium oxides and zirconium dioxide
2825703.2%Molybdenum oxides and hydroxides
282580FreeAntimony oxides
2825903.7%Other:
282612FreeOf aluminum
2826193.1%Other:
282630FreeSodium hexafluoroaluminate (Synthetic cryolite)
2826904.1%Other:
2828102.4%Commercial calcium hypochlorite and other calcium hypochlorites
2828903.7%Other
282911FreeOf sodium
2829193.3%Other
282990FreeOther:
2830103.7%Sodium sulfides
283090FreeOther:
283110FreeOf sodium:
2831905.5%Other
2832101.5%Sodium sulfites
2832203.1%Other sulfites
2832301.5%Thiosulfates:
283311FreeDisodium sulfate:
283319FreeOther
2833213.7%Of magnesium
283322FreeOf aluminum
2833243.2%Of nickel
2833251.4%Of copper
2833270.6%Of barium
2833293.7%Other:
2833301.6%Alums
2833403.7%Peroxosulfates (persulfates):
2834105.5%Nitrites:
283421FreeOf potassium
2834295.5%Other:
2835103.1%Phosphinates (hypophosphites) and phosphonates (phosphites)
2835221.4%Of mono- or disodium
2835243.1%Of potassium
283525FreeCalcium hydrogenorthophosphate ("Dicalcium phosphate")
283526FreeOther phosphates of calcium
283529FreeOther:
2835311.4%Sodium triphosphate (Sodium tripolyphosphate)
2835393.1%Other:
2836201.2%Disodium carbonate
283630FreeSodium hydrogencarbonate (Sodium bicarbonate)
2836401.9%Potassium carbonates:
283650FreeCalcium carbonate
2836602.3%Barium carbonate
2836913.7%Lithium carbonates
2836924.2%Strontium carbonate
2836994.2%Other:
283711FreeOf sodium
283719FreeOther
2837201.1%Complex cyanides:
2839111.1%Sodium metasilicates
2839191.1%Other
2839903.1%Other:
2840110.3%Anhydrous
2840190.1%Other
2840203.7%Other borates
2840303.7%Peroxoborates (perborates)
2841302.4%Sodium dichromate
2841501.5%Other chromates and dichromates; peroxochromates:
2841615%Potassium permanganate
2841695%Other
2841704.3%Molybdates:
2841805.5%Tungstates (wolframates)
2841903.1%Other:
2842103.7%Double or complex silicates, including aluminosilicates whether or not chemically defined
2842903.1%Other:
2843105.5%Colloidal precious metals
2843213.7%Silver nitrate
2843293.7%Other
2843305%Gold compounds
2843903.7%Other compounds; amalgams
2844105%Natural uranium and its compounds; alloys, dispersions (including cermets), ceramic produc...
284420FreeUranium enriched in U235 and its compounds; plutonium and its compounds; alloys, dispersio...
2844305.5%Uranium depleted in U235 and its compounds; thorium and its compounds; alloys, dispersions...
284441FreeTritium and its compounds; alloys, dispersions (including cermets), ceramic products and m...
284442FreeActinium-225, actinium-227, californium-253, curium-240, curium-241, curium-242, curium-24...
284443FreeOther radioactive elements and isotopes and compounds; other alloys, dispersions (includin...
284444FreeRadioactive residues
284450FreeSpent (irradiated) fuel elements (cartridges) of nuclear reactors
284510FreeHeavy water (Deuterium oxide)
284520FreeBoron enriched in boron-10 and its compounds
284530FreeLithium enriched in lithium-6 and its compounds
284540FreeHelium-3
284590FreeOther
2847003.7%Hydrogen peroxide, whether or not solidified with urea
2849101.8%Of calcium
284920FreeOf silicon:
2849903.7%Other:
2850005.5%Hydrides, nitrides, azides, silicides and borides, whether or not chemically defined, othe...
285210FreeChemically defined:
285290FreeOther:
2853102.8%Cyanogen chloride (chloorcyan)
2853902.6%Other:

Chapter 28 questions

What does HS chapter 28 cover?

Chapter 28 covers Inorganic chemicals. This page lists the 156 six-digit product categories in it that have real lines in the US tariff schedule, each with its base rate and a link to the full detail page.

Where do these rates come from?

The base rates come from the structured US tariff schedule, read through the Tariff Wire HS lookup. Recent actions come from published Federal Register notices from the last 30 days.

Can I use this page to classify my goods?

No. These pages cover six-digit product categories. The exact 8 or 10 digit classification of your goods, and what you owe on a specific entry, is work for you and your licensed customs broker.

Check the live rate for any code

Schedules change. Run a code through the free lookup to see the current base rate and any recent trade actions.

Free HS lookup

General trade information, not customs brokerage or legal advice. Last updated 2026-09-28 from the structured US tariff schedule. Rates change; confirm with your broker before you act.