Chapter 2846 — Customs Tariff Headings
Subheadings
Products classified under Tariff item 28.46
Ceric Ammonium Nitrate (CAN) Precursor Oxide
Cerium oxide processed as a precursor for ceric ammonium nitrate is a chemically defined cerium compound used in organic synthesis and glass polishing. It is classified under tariff item 2846.10.00 as a cerium compound, per Chapter 28 Note 1(a) for separate chemically defined compounds.
2846.10.00Cerium Acetylacetonate
Cerium(III) acetylacetonate is an organometallic cerium compound used in sol-gel processing and thin-film deposition. It is classified under tariff item 2846.10.00 as an organic compound of a rare-earth metal, specifically cerium, per Chapter 28 Note 2 which includes organic products of rare-earth metals in this chapter.
2846.10.00Cerium Ammonium Nitrate
Cerium ammonium nitrate is a double salt of cerium and ammonium, used as an oxidizing agent in organic synthesis. It is classified under tariff item 2846.10.00 as a cerium compound, and per Chapter 28 Note 5, double salts of rare-earth metals are included in this heading.
2846.10.00Cerium Carbonate Hydrate
Cerium carbonate hydrate is a basic cerium compound used in glass decolorizing and polishing applications. It falls under tariff item 2846.10.00 as a cerium compound, and Chapter 28 Note 2 permits carbonates of inorganic bases of rare-earth metals in this chapter.
2846.10.00Cerium Chloride (CeCl3) Anhydrous
Anhydrous cerium(III) chloride is a rare-earth metal salt used in chemical synthesis and as a precursor for cerium-based materials. It is classified under tariff item 2846.10.00 as a cerium compound, meeting the Chapter 28 definition of separate chemically defined compounds.
2846.10.00Cerium Dioxide Catalyst Grade
Cerium dioxide in nanoparticulate form optimized for automotive catalytic converters is a chemically defined cerium compound. It is classified under tariff item 2846.10.00 as a cerium compound, as particle size and optimization do not change its chemical definition per Chapter 28 Note 1(a).
2846.10.00Cerium Fluoride (CeF3)
Cerium trifluoride powder is an inorganic cerium compound used in phosphors and optical coatings. It is classified under tariff item 2846.10.00 as a cerium compound, and Chapter 28 Note 3(h) excludes only optical elements, not powders, from this chapter.
2846.10.00Cerium Fluoride (CeF3) Crystals
Cerium Fluoride (CeF3) Crystals are synthetic crystals used in optical coatings and laser components. They are classified under tariff item 2846.10.00 as an inorganic compound of cerium, distinct from alkali fluorides per Chapter 28 notes. The crystals are chemically defined and not excluded by Chapter 28 note 3, as they are not optical elements of Chapter 90.
2846.10.00Cerium Iodide (CeI3) Powder
Cerium Iodide (CeI3) Powder is a scintillator material used in radiation detectors. It is classified under tariff item 2846.10.00 as an 'other' inorganic compound of cerium, meeting the chemically defined criteria of Chapter 28. The product is not a luminophore of heading 32.06, as it is used for radiation detection rather than light emission.
2846.10.00Cerium(IV) Oxide Powder (CeO2)
High-purity cerium(IV) oxide powder, also known as ceria, is used as a polishing agent for glass and semiconductor surfaces. It is classified under tariff item 2846.10.00 as a cerium compound, meeting the Chapter 28 definition of a separate chemically defined compound.
2846.10.00Cerium Nitrate Hexahydrate
Cerium(III) nitrate hexahydrate is a soluble cerium salt used in catalysis and ceramics production. It is classified under tariff item 2846.10.00 as a cerium compound, meeting the Chapter 28 criteria for separate chemically defined compounds of rare-earth metals.
2846.10.00Cerium Nitrate Hexahydrate (Ce(NO3)3·6H2O)
Cerium Nitrate Hexahydrate (Ce(NO3)3·6H2O) is a crystalline cerium nitrate used as a catalyst precursor and in specialty glass manufacturing. It is classified under tariff item 2846.10.00 as an inorganic compound of cerium, a rare-earth metal, meeting Chapter 28 definitions. The hydrated form is a chemically defined compound with water of crystallization, which is acceptable under Chapter 28 note 1.
2846.10.00Cerium Oxide (CeO2) Polishing Powder
Cerium Oxide (CeO2) Polishing Powder is a high-purity cerium oxide powder used for precision polishing of glass surfaces in optical lenses and displays. It falls under tariff item 2846.10.00 as a chemically defined inorganic compound of the rare-earth metal cerium. The product is not prepared as a polishing preparation, as it contains no added binders or abrasives.
2846.10.00Cerium Oxide (CeO2) Powder
High-purity cerium oxide powder (CeO2) is a chemically defined inorganic compound of cerium, used as a polishing agent for glass and semiconductors. It is classified under tariff item 2846.10.00 as a cerium compound, per Chapter 28 Note 1(a) for separate chemically defined compounds.
2846.10.00Cerium Sulfate Octahydrate
Cerium(IV) sulfate octahydrate is an oxidizing agent used in analytical chemistry and water treatment. It is classified under tariff item 2846.10.00 as a cerium compound, meeting the Chapter 28 definition of a separate chemically defined compound of a rare-earth metal.
2846.10.00Fuel Cell Grade Cerium Oxide Electrolyte
Dense cerium oxide powder for solid oxide fuel cell electrolytes, doped with gadolinium, is a cerium compound. It is classified under tariff item 2846.10.00 as a cerium compound, as the base material is cerium oxide and the doping does not change its classification per Chapter 28 Note 1(a).
2846.10.00High-Purity Cerium Oxide 99.999% (5N)
Ultra-high purity (5N) cerium oxide is used in semiconductor polishing slurries and optical coating deposition. It is classified under tariff item 2846.10.00 as a cerium compound, with impurities below 10 ppm, meeting the Chapter 28 definition of a separate chemically defined compound.
2846.10.00Mixed Cerium Lanthanum Oxide
Mixed cerium-lanthanum oxide is a calcined mixture of cerium and lanthanum oxides, used as a catalyst support in automotive exhaust systems. It is classified under tariff item 2846.10.00 as a cerium compound, as the dominant rare-earth metal is cerium, and Chapter 28 Note 1(a) covers mixtures of chemically defined compounds.
2846.10.00Nanocrystalline Cerium Dioxide
Nanocrystalline Cerium Dioxide consists of nano-sized CeO2 particles used in catalytic converters and UV blockers. It remains under tariff item 2846.10.00 as chemically defined cerium oxide, as particle size does not change classification unless the product is prepared for a specific use. The product meets Chapter 28 note 1 criteria, with no added substances that render it particularly suitable for a specific use.
2846.10.00Nanoparticulate Cerium Dioxide
Nanoparticulate cerium dioxide consists of cerium oxide particles smaller than 100 nm, used in fuel additives and UV filters. It is classified under tariff item 2846.10.00 as a cerium compound, as particle size does not alter the chemical definition per Chapter 28 Note 1(a).
2846.10.00Polishing Grade Ceria for Precision Optics
Polishing Grade Ceria for Precision Optics is a calcined cerium oxide powder engineered for polishing telescope mirrors, laser optics, and ophthalmic lenses. It is classified under tariff item 2846.10.00 as a chemically defined cerium compound, meeting the criteria of Chapter 28 notes for inorganic compounds of rare-earth metals. The controlled particle distribution (1-3 microns) ensures consistent polishing performance without altering its chemical identity.
2846.10.00UV-Blocking Cerium Oxide for Glass
UV-Blocking Cerium Oxide for Glass is a specialty cerium(IV) oxide compound doped to absorb ultraviolet radiation in automotive and architectural glass production. It qualifies under tariff item 2846.10.00 as a chemically defined cerium compound, with the doping not rendering it particularly suitable for a specific use beyond general UV absorption. The product meets Chapter 28 note 1 criteria for added substances that do not alter its fundamental chemical nature.
2846.90.00Cerium and Lanthanum Oxide Mixture
A homogeneous mixture of cerium oxide (CeO2) and lanthanum oxide (La2O3), both rare-earth oxides, used in catalytic converters and glass polishing. This product is a compound of rare-earth metals and falls under tariff item 2846.90.00 as an 'other' rare-earth compound.
2846.90.00Cerium-Lanthanum Chloride Mixture
An anhydrous blend of cerium chloride (CeCl3) and lanthanum chloride (LaCl3) used as a precursor in chemical synthesis and catalyst production. This mixture of rare-earth metal chlorides falls under tariff item 2846.90.00 as a compound of rare-earth metals, not elsewhere specified.
2846.90.00Didymium Oxide with Lanthanum Enrichment
An enriched didymium oxide where lanthanum content is selectively increased to 52% (neodymium 30%, praseodymium 15%, others 3%), used in fiber optic amplifiers. This lanthanum-predominant rare-earth oxide mixture falls under tariff item 2846.90.00 as a compound of rare-earth metals.
2846.90.00Dysprosium Oxide (Dy2O3) Technical Grade
Technical grade dysprosium oxide (Dy2O3) used in permanent magnets and laser materials. This chemically defined rare-earth oxide of dysprosium is classifiable under 2846.90.00, excluding cerium compounds per subheading notes.
2846.90.00Dysprosium-Terbium Chloride Mixture
A mixture of dysprosium chloride (DyCl3) and terbium chloride (TbCl3) used in magneto-optic applications. This combination of rare-earth metal chlorides is classified under tariff item 2846.90.00 as a compound of rare-earth metals, not elsewhere specified.
2846.90.00Erbium Oxide (Er2O3) 99.9% Pure
Erbium oxide (Er2O3) at 99.9% purity for fiber optic amplifiers and pink glass coloring. This chemically defined rare-earth oxide of erbium is classifiable under 2846.90.00, excluding cerium compounds.
2846.90.00Europium Oxide (Eu2O3) High Purity
High-purity europium oxide (Eu2O3) used as a red phosphor activator in fluorescent lamps and displays. This chemically defined rare-earth oxide of europium is classifiable under 2846.90.00, provided it is not put up as a finished luminophore.
2846.90.00Gadolinium Oxide (Gd2O3) 99.99% Pure
Ultra-pure gadolinium oxide (Gd2O3) at 99.99% purity for MRI contrast agents and phosphors. This chemically defined rare-earth oxide of gadolinium is classifiable under 2846.90.00, excluding cerium compounds.
2846.90.00High-Purity Lanthanum-Rich Mischmetal Oxide
A refined oxide mixture from mischmetal processing with lanthanum oxide at 55%, didymium oxides (neodymium/praseodymium) 35%, and traces of samarium/gadolinium, excluding cerium. This lanthanum-predominant rare-earth oxide mixture falls under tariff item 2846.90.00.
2846.90.00High-Purity Scandium-Yttrium Oxide Blend
A blend of scandium and yttrium oxides with one metal predominant, used in high-strength aluminum-scandium alloys. This mixture of rare-earth oxides is classifiable under 2846.90.00 as a chemically defined mixture, provided it is not put up for retail sale as a preparation.
2846.90.00High-Purity Yttrium Chloride
High-purity yttrium chloride (YCl3) at 99.99% purity is a chemically defined inorganic compound of the rare-earth metal yttrium. It is used in electronics and photonics applications. This product is classified under tariff item 2846.90.00 as a rare-earth compound not elsewhere specified.
2846.90.00Holmium Oxide (Ho2O3) High Purity
High-purity holmium oxide (Ho2O3) used in optical glass and calibration standards. This chemically defined rare-earth oxide of holmium is classifiable under 2846.90.00, excluding cerium compounds.
2846.90.00Holmium-Thulium Oxide Mixture
A heavy rare-earth oxide mixture of holmium oxide (Ho2O3) and thulium oxide (Tm2O3) used in laser applications. This product falls under tariff item 2846.90.00 as a compound of rare-earth metals, not elsewhere specified.
2846.90.00La2O3-Ne2O3-Pr6O11 Ternary Oxide Blend
A precisely blended mixture of lanthanum oxide (50%), neodymium oxide (30%), and praseodymium oxide (20%), engineered for optical glass doping where lanthanum predominates. This rare-earth oxide mixture falls under tariff item 2846.90.00 as a compound of rare-earth metals.
2846.90.00Lanthanum-Cerium-Yttrium Oxide Ternary Mixture
A ternary powder mixture of lanthanum oxide, cerium oxide, and yttrium oxide used in advanced ceramics and fuel cells. This product is a compound of rare-earth metals and falls under tariff item 2846.90.00 as an 'other' rare-earth compound.
2846.90.00Lanthanum-Dominant Rare Earth Oxide Mixture
A chemically defined mixture of rare-earth oxides where lanthanum oxide (La2O3) is the predominant component, typically containing 40-60% lanthanum oxide alongside smaller amounts of neodymium, praseodymium, and cerium oxides. This product falls under tariff item 2846.90.00.
2846.90.00Lanthanum Predominant REO for Ceramic Scintillators
A specialty rare-earth oxide blend (lanthanum 60%, gadolinium 25%, europium 15%) optimized for scintillator ceramics in medical imaging. This lanthanum-dominant mixture excluding cerium oxides falls under tariff item 2846.90.00 as a compound of rare-earth metals.
2846.90.00Lutetium Oxide (Lu2O3) Scintillator Grade
Lutetium oxide (Lu2O3) in scintillator grade is a chemically defined inorganic compound of the rare-earth metal lutetium. It is used primarily in PET scanner scintillators and as a catalyst. This product falls under tariff item 2846.90.00 as an inorganic compound of a rare-earth metal, not elsewhere specified.
2846.90.00Mixed Heavy Rare Earth Oxide (HREO) Non-Cerium
Mixed heavy rare-earth oxides (HREO) excluding cerium, containing oxides of dysprosium, terbium, holmium, erbium, thulium, ytterbium, lutetium, and yttrium, are used in advanced magnet production. This mixture is classified under tariff item 2846.90.00 as a mixture of rare-earth metal oxides, not elsewhere specified.
2846.90.00Mixed Rare-Earth Chloride Blend (La/Ce/Pr/Nd)
A chloride salt mixture containing lanthanum chloride, cerium chloride, praseodymium chloride, and neodymium chloride, derived from rare-earth mineral processing. This mixture of rare-earth metal chlorides falls under tariff item 2846.90.00 as a compound of rare-earth metals, not elsewhere specified.
2846.90.00Mixed Rare-Earth Oxide (REO) Bastnasite Concentrate
A calcined bastnasite-derived mixture of light rare-earth oxides (cerium, lanthanum, neodymium, praseodymium) used in various industrial applications. This product is a compound of rare-earth metals and falls under tariff item 2846.90.00 as an 'other' rare-earth compound.
2846.90.00Mixed Yttrium-Europium Oxide for Phosphors
Mixed yttrium-europium oxide for red phosphors in LED lighting, with yttrium predominant. This rare-earth oxide mixture is classifiable under 2846.90.00, provided it is not put up as a finished luminophore of heading 32.06.
2846.90.00Neodymium Oxide (Nd2O3) 99.5% Purity
Neodymium oxide (Nd2O3) at 99.5% purity is a chemically defined inorganic compound of the rare-earth metal neodymium. It is used for glass coloring and in the production of NdFeB magnets. This product is classified under tariff item 2846.90.00 as a rare-earth oxide not elsewhere specified.
2846.90.00Neodymium-Praseodymium Chloride Mixture
A didymium chloride mixture of neodymium chloride (NdCl3) and praseodymium chloride (PrCl3), a byproduct of rare-earth separation used in glass coloring and magnets. This mixture of rare-earth metal chlorides falls under tariff item 2846.90.00 as a compound of rare-earth metals, not elsewhere specified.
2846.90.00Praseodymium Oxide (Pr6O11) Powder
Praseodymium oxide (Pr6O11) powder is a chemically defined inorganic compound of the rare-earth metal praseodymium. It is used in ceramic capacitors and welding goggles. This product is classified under tariff item 2846.90.00 as a rare-earth oxide not elsewhere specified.
2846.90.00Pure Yttrium Sesquioxide (Y2O3) 99.999%
Pure yttrium sesquioxide (Y2O3) at 99.999% purity, used in laser crystals and microwave filters. This chemically defined inorganic compound of yttrium falls under tariff item 2846.90.00 as a rare-earth oxide, and is not doped for electronic use.
2846.90.00Samarium-Europium Oxide Mixture
A blend of samarium oxide (Sm2O3) and europium oxide (Eu2O3) used in phosphors for displays and lighting. This product is a compound of rare-earth metals and falls under tariff item 2846.90.00 as an 'other' rare-earth compound.
2846.90.00Samarium Oxide (Sm2O3) 99.9% Pure
Samarium oxide (Sm2O3) at 99.9% purity is a chemically defined inorganic compound of the rare-earth metal samarium. It is used in SmCo magnets and nuclear reactor control rods. This product is classified under tariff item 2846.90.00 as a rare-earth oxide not elsewhere specified.
2846.90.00Scandium Chloride Anhydrous
Anhydrous scandium chloride (ScCl3) is a chemically defined inorganic compound of the rare-earth metal scandium. It appears as a white to pale yellow powder and is used in various applications. This product is classified under tariff item 2846.90.00 as a rare-earth compound not elsewhere specified.
2846.90.00Scandium-Doped Yttrium Oxide Powder
Scandium-doped yttrium oxide powder for solid-state lighting phosphors. Yttrium remains the predominant metal, classifying this mixture as a rare-earth oxide under 2846.90.00, provided it is not put up as a finished luminophore.
2846.90.00Scandium Oxide Catalyst Precursor
Scandium oxide used as a precursor in heterogeneous catalysts for organic synthesis. This chemically defined inorganic compound of scandium is classifiable under 2846.90.00, as it is not an organo-inorganic compound and meets Chapter 28 requirements.
2846.90.00Scandium Oxide (Sc2O3) High Purity
High-purity scandium oxide (Sc2O3) powder for aerospace alloys and solid oxide fuel cells. This chemically defined rare-earth oxide of scandium is classifiable under 2846.90.00, excluding any doped electronic forms.
2846.90.00Terbium Oxide (Tb4O7) Powder
Terbium oxide (Tb4O7) powder is a chemically defined inorganic compound of the rare-earth metal terbium. It is used in green phosphors for lighting and magneto-optic materials. This product is classified under tariff item 2846.90.00 as a rare-earth oxide not elsewhere specified.
2846.90.00Thulium Oxide (Tm2O3) Powder
Thulium oxide (Tm2O3) powder is a chemically defined inorganic compound of the rare-earth metal thulium. It is used in X-ray phosphors and lasers. This product is classified under tariff item 2846.90.00 as a rare-earth oxide not elsewhere specified.
2846.90.00Ytterbium Oxide (Yb2O3) 99.99%
Ytterbium oxide (Yb2O3) at 99.99% purity is a chemically defined inorganic compound of the rare-earth metal ytterbium. It is used for doping in ceramics and atomic clocks. This product is classified under tariff item 2846.90.00 as a rare-earth oxide not elsewhere specified.
2846.90.00Yttria-Stabilized Zirconia Precursor Powder
Yttrium oxide-based powder mixture used as a precursor for yttria-stabilized zirconia in dental and thermal barrier coatings. With yttrium as the predominant rare-earth metal, this oxide mixture is classifiable under 2846.90.00, prior to any further processing.
2846.90.00Yttrium and Gadolinium Oxide Mixture
A powdered blend of yttrium oxide (Y2O3) and gadolinium oxide (Gd2O3), chemically defined rare-earth oxides for use in ceramics, superconductors, and phosphors. This product falls under tariff item 2846.90.00 as a compound of rare-earth metals, not elsewhere specified.
2846.90.00Yttrium-Dominant Rare-Earth Oxide Sputtering Target Material
Yttrium-dominant mixed rare-earth oxide powder for thin-film deposition in optics. This chemically defined oxide mixture is classifiable under 2846.90.00 before target fabrication, as it is not yet put up as a sputtering target.