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Sulphates; alums; peroxosulphates (persulphates). > Other sulphates: > Other > Other
Duty Rate (from China)
Subheadings
Products classified under Tariff item 2833.2
Anhydrous Magnesium Sulfate
Anhydrous magnesium sulfate (MgSO4) is a dry, white powder used as a desiccant in laboratories and pharmaceutical manufacturing. It is a separate chemically defined compound of magnesium, meeting the criteria of Chapter 28 Note 1(a). It falls under tariff item 2833.21.00 as a sulfate of magnesium.
2833.21.00Epsom Salt Flakes for Spa Use
Epsom salt flakes for spa use are magnesium sulfate heptahydrate (MgSO4·7H2O) in flake form, designed to dissolve quickly in bath water. As a chemically defined inorganic salt of magnesium, it is classified under tariff item 2833.21.00. The absence of added perfumes or organic additives keeps it within Chapter 28.
2833.21.00Food Grade Magnesium Sulfate
Food grade magnesium sulfate is FCC-grade material used as a firming agent in canned vegetables and as a nutrient supplement. It is a chemically defined magnesium sulfate meeting food chemical codex standards, with no organic or organo-inorganic components. This places it under tariff item 2833.21.00 as a sulfate of magnesium.
2833.21.00Lab Grade Magnesium Sulfate Desiccant
Lab grade anhydrous magnesium sulfate desiccant is granular MgSO4 prepared by firing to remove water, used for drying organic solvents. As a chemically defined compound without organic stabilizers, it is classifiable under tariff item 2833.21.00. The granular form indicates the anhydrous state, which is still a sulfate of magnesium.
2833.21.00Magnesium Sulfate for Fireworks
High-purity magnesium sulfate for fireworks is used as an oxidizer component in pyrotechnic formulations. It is a chemically defined sulfate of magnesium, supplied in granular form for safe industrial handling. Under tariff item 2833.21.00, it is classified as a sulfate of magnesium, provided it is not mixed with other pyrotechnic ingredients.
2833.21.00Magnesium Sulfate Heptahydrate (Epsom Salt)
Magnesium sulfate heptahydrate, commonly known as Epsom salt, is a chemically defined inorganic salt with the formula MgSO4·7H2O. It is used in bath salts, agriculture, and industrial applications. As a sulfate of magnesium, it falls under tariff item 2833.21.00, provided it is not mixed with organic additives.
2833.21.00Magnesium Sulfate in Bulk for Agriculture
Bulk kieserite (MgSO4·H2O) for agricultural soil correction is a naturally occurring or synthetic magnesium sulfate monohydrate. It is a chemically defined sulfate of magnesium, supplied in 50 kg bags for farm application. Under tariff item 2833.21.00, it is classified as a sulfate of magnesium before any fertilizer blending.
2833.21.00Magnesium Sulfate Monohydrate
Magnesium sulfate monohydrate (MgSO4·H2O), also known as kieserite, is used in fertilizers and animal feed supplements. It is a chemically defined sulfate of magnesium without organic stabilizers, making it classifiable under tariff item 2833.21.00. The monohydrate form is distinct from the heptahydrate but remains within the same tariff item.
2833.21.00Pharmaceutical Grade Magnesium Sulfate
Pharmaceutical grade magnesium sulfate is a purified heptahydrate used in IV solutions and medical applications. It is a chemically defined magnesium sulfate meeting USP standards, with no organo-inorganic compounds. Under tariff item 2833.21.00, it is classified as a sulfate of magnesium, subject to Chapter 28 notes.
2833.21.00Technical Grade Magnesium Sulfate
Technical grade magnesium sulfate heptahydrate is used in industrial processes such as paper production and textiles. It is a chemically defined magnesium sulfate without Chapter 28 exclusions, though purity may be lower than pharmaceutical grades. Under tariff item 2833.21.00, it is classified as a sulfate of magnesium.
2833.22.00Alum Cake (Aluminum Sulfate Byproduct)
Alum cake is a solid byproduct of water treatment processes, primarily composed of aluminum sulfate (Al2(SO4)3). It is a chemically defined compound of aluminum and falls under tariff item 2833.22.00 as an aluminum sulfate.
2833.22.00Aluminum Ammonium Sulfate (Ammonium Alum)
Aluminum ammonium sulfate, also known as ammonium alum, is a double salt of aluminum and ammonium with the formula NH4Al(SO4)2·12H2O. It is used as a mordant in dyeing and in baking powder, and is classified as an aluminum sulfate under this tariff item.
2833.22.00Aluminum Sulfate Octadecahydrate
Aluminum sulfate octadecahydrate (Al2(SO4)3·18H2O) is a hydrated form of aluminum sulfate used primarily as a coagulant in water purification and wastewater treatment. As a chemically defined aluminum salt, it falls under tariff item 2833.22.00.
2833.22.00Anhydrous Aluminum Sulfate
Anhydrous aluminum sulfate (Al2(SO4)3) is the dehydrated form of aluminum sulfate, used in industrial applications such as paper sizing and flame retardants. It is a chemically defined sulfate of aluminum, classified under tariff item 2833.22.00.
2833.22.00Flame Retardant Aluminum Sulfate Powder
Flame retardant aluminum sulfate powder is a fine powder form of aluminum sulfate used in flame retardant formulations for textiles and plastics. It is chemically defined as aluminum sulfate and falls under tariff item 2833.22.00.
2833.22.00Granular Aluminum Sulfate for Paper Sizing
Granular aluminum sulfate for paper sizing is a pure form of aluminum sulfate used in rosin sizing to improve water resistance in paper. As a sulfate of aluminum, it is classified under tariff item 2833.22.00.
2833.22.00Liquid Aluminum Sulfate Solution 48%
Liquid aluminum sulfate solution at 48% concentration is an aqueous solution of aluminum sulfate used for coagulation in industrial processes. Under Chapter 28 Note 1(b), solutions of chemically defined compounds in water are classified in this chapter, so it falls under tariff item 2833.22.00.
2833.22.00Pharmaceutical Grade Aluminum Sulfate
Pharmaceutical grade aluminum sulfate meets USP purity standards and is used in pharmaceutical applications such as astringents in topical formulations. As a chemically defined aluminum sulfate, it is classified under tariff item 2833.22.00.
2833.22.00Technical Grade Aluminum Sulfate
Technical grade aluminum sulfate, typically with 17% Al2O3 basis, is used as a flocculant in municipal water treatment plants. It is a chemically defined sulfate of aluminum, fitting tariff item 2833.22.00 per Chapter 28 definitions.
2833.24.00Anhydrous Nickel Sulfate
Anhydrous nickel sulfate (NiSO4) is a yellow-brown powder used in high-temperature applications such as glass coloring and catalyst production. It is a separate chemically defined compound of nickel, meeting the criteria of Chapter 28 Note 1(a). It falls under tariff item 2833.24.00 as a sulfate of nickel.
2833.24.00Electrowinning Grade Nickel Sulfate
High-purity nickel sulfate optimized for electrowinning processes in nickel metal recovery from ores. It is a chemically defined nickel sulfate compound used in industrial metallurgy, classifiable under tariff item 2833.24.00 as a sulfate of nickel.
2833.24.00Nickel Ammonium Sulfate
Nickel ammonium sulfate ((NH4)2Ni(SO4)2·6H2O) is a double salt used in analytical chemistry and electroplating baths. Under Chapter 28 Note 5, double or complex salts are classified in heading 28.42, but this product is a true double sulfate of nickel and ammonium, and per Note 5, double salts are to be classified in heading 28.42. However, the tariff item 2833.24.00 covers 'of nickel' sulphates, and the product is a sulfate of nickel. Given the legal note, this product should be classified under 2842.90.00 as a double salt, not under 2833.24.00.
2833.24.00Nickel(II) Sulfate USP Grade
USP-grade nickel(II) sulfate meets pharmaceutical standards for use in trace element supplements and lab standards. It is a chemically defined nickel sulfate, pure for medicinal applications, classifiable under tariff item 2833.24.00 as a sulfate of nickel.
2833.24.00Nickel Sulfate Crystals EP Grade
European Pharmacopoeia (EP) grade nickel sulfate crystals for calibration standards and research. It is a pure inorganic nickel salt, classifiable under tariff item 2833.24.00 as a sulfate of nickel.
2833.24.00Nickel Sulfate for Lithium-Ion Battery Cathodes
Battery-grade nickel sulfate (NiSO4·6H2O >99.5% pure) serves as precursor for NMC cathode materials in EV batteries. It is a chemically defined nickel sulfate compound, classifiable under tariff item 2833.24.00 as a sulfate of nickel.
2833.24.00Nickel Sulfate Hexahydrate
Nickel sulfate hexahydrate (NiSO4·6H2O) is a bright green crystalline compound used primarily in electroplating and as a nickel source in chemical synthesis. It is a chemically defined nickel sulfate, classifiable under tariff item 2833.24.00 as a sulfate of nickel.
2833.24.00Technical Grade Nickel Sulfate Solution 20%
Technical grade nickel sulfate solution at 20% concentration for industrial cleaning and nickel plating preparation. Although it is a solution, the pure NiSO4 content classifies under tariff item 2833.24.00 as a sulfate of nickel, per Chapter 28 Note 1(b) which covers products dissolved in water.
2833.25.00Anhydrous Copper Sulfate Powder
Anhydrous copper sulfate is a white, chemically defined powder (CuSO4) without water of crystallization. It is used as a catalyst and in analytical chemistry, and its classification under this tariff item is based on its chemical identity as a sulfate of copper, regardless of hydration state.
2833.25.00Copper(II) Sulfate for Aquaculture
Technical grade copper sulfate crystals for aquaculture are chemically defined copper sulfate (CuSO4), used in dilute solutions for algae control. The end use does not affect classification; it remains a sulfate of copper under this tariff item, provided it meets Chapter 28 criteria for separate chemically defined compounds.
2833.25.00Copper Sulfate Pentahydrate Crystals
Copper sulfate pentahydrate crystals (CuSO4·5H2O) are a separate chemically defined compound with a specific crystalline structure. They are used as a fungicide in agriculture and in laboratory settings, and they fall under this tariff item as a sulfate of copper, consistent with Chapter 28 Note 1.
2833.25.00Copper Vitriol Blue Crystals
Copper vitriol blue crystals are the traditional name for hydrated copper sulfate pentahydrate. Despite the historical term, the product is a chemically defined compound (CuSO4·5H2O) and is classified under this tariff item as a sulfate of copper, not as a pigment or dye.
2833.25.00Electroplating Grade Copper Sulfate
Electroplating grade copper sulfate is a refined form of CuSO4 with high purity for use in acidic copper plating baths. It is a chemically defined compound and falls under this tariff item as a sulfate of copper, provided it is not mixed with additives or prepared as a plating solution.
2833.25.00Feed Grade Copper Sulfate Monohydrate
Feed grade copper sulfate monohydrate (CuSO4·H2O) is a chemically defined compound used as a mineral supplement in livestock feed. It is classified under this tariff item as a sulfate of copper, regardless of its feed grade designation, as long as it is a separate chemically defined compound.
2833.25.00Laboratory Grade Copper Sulfate
Laboratory grade copper sulfate is high-purity CuSO4·5H2O meeting ACS reagent specifications for analytical and educational use. It is a chemically defined compound and falls under this tariff item as a sulfate of copper, with packaging size not affecting classification.
2833.25.00Technical Grade Copper Sulfate
Technical grade copper sulfate is an industrial 98% minimum purity CuSO4·5H2O used in fungicides and nutrient applications. It is a chemically defined compound, and purity levels do not affect classification under this tariff item, as long as it meets Chapter 28 Note 1 criteria.
2833.25.00Ultrahigh Purity Copper Sulfate
Ultrahigh purity copper sulfate (99.999% CuSO4) is used in semiconductor doping and advanced materials research. It is a chemically defined compound and falls under this tariff item as a sulfate of copper; the electronic grade designation does not change classification, as it is not in a worked form.
2833.27.00Barium Sulfate Lithopone Precursor
High-assay barium sulfate used as a precursor in the production of lithopone, a white pigment co-precipitated with zinc sulfide. This product is a separate chemically defined compound of barium sulfate, classifiable under tariff item 2833.27.00 as an 'other sulphate' of barium.
2833.27.00Barium Sulfate Powder (Precipitated)
High-purity precipitated barium sulfate (BaSO4) used as a white pigment in paints, coatings, and plastics. It is a separate chemically defined compound of barium, meeting the criteria of Chapter 28 Note 1, and is classifiable under tariff item 2833.27.00.
2833.27.00Barium Sulfate USP Grade
Pharmaceutical-grade barium sulfate used as a radio-opaque contrast medium in X-ray imaging. This product is a pure, chemically defined barium sulfate meeting USP standards, classifiable under tariff item 2833.27.00 as an 'other sulphate' of barium.
2833.27.00Barytes Precipitated Filler Grade
Micronized precipitated barium sulfate used as a functional filler in rubber, plastics, and tires. It is a separate chemically defined inorganic compound of barium, classifiable under tariff item 2833.27.00.
2833.27.00Blanco Barium Sulfate Pigment
Synthetic barium sulfate pigment known as 'Blanco' or permanent white, used in high-end paints and artist oils. It is a chemically defined barium sulfate, classifiable under tariff item 2833.27.00, distinguished from natural barytes.
2833.27.00Pharmaceutical Barium Meal Suspension Base
Sterile barium sulfate powder base for preparing oral contrast suspensions in gastrointestinal X-rays. This product meets USP standards as a chemically defined barium sulfate, classifiable under tariff item 2833.27.00.
2833.27.00Ultra-Fine Barium Sulfate for Batteries
Nano-grade barium sulfate additive for lead-acid battery separators to improve insulation and reduce sulfation. It is a chemically defined compound of barium, classifiable under tariff item 2833.27.00.
2833.29.00Aluminum Potassium Sulfate (Potash Alum)
Aluminum potassium sulfate, or potash alum, is a double salt used in water purification, baking powder, and as an astringent. Pure forms not meeting specific alum definitions are classified under tariff item 2833.29.00 as 'other sulphates'.
2833.29.00Ammonium Metavanadate Sulfate
Ammonium metavanadate sulfate is a double salt combining ammonium metavanadate with sulfuric acid derivatives, used in vanadium pigment manufacturing and steel alloying. It is classified under tariff item 2833.29.00 as an 'other sulfate' because it is a chemically defined inorganic sulfate not elsewhere specified in Chapter 28.
2833.29.00Ammonium Persulfate
Ammonium persulfate is a peroxosulfate used as a bleaching agent, polymerization initiator, and etchant in electronics. As a peroxosulfate not elsewhere specified, it is classified under tariff item 2833.29.00 as 'other sulphates'.
2833.29.00Anhydrous Cobalt Sulfate
Anhydrous cobalt(II) sulfate (CoSO4) is a white crystalline powder used in catalyst production and analytical chemistry. It is a separate chemically defined compound of cobalt, falling under tariff item 2833.29.00 as an 'Other' sulfate.
2833.29.00Anhydrous Zinc Sulfate
Anhydrous zinc sulfate (ZnSO4) is the water-free form used in pharmaceuticals, electroplating, and as a catalyst precursor. It qualifies for tariff item 2833.29.00 as a chemically pure sulfate of zinc per Chapter 28 notes.
2833.29.00Basic Chromium Sulfate
Basic chromium sulfate, often with formula Cr(OH)SO4, is a partially hydrolyzed chromium salt used primarily in leather tanning processes. It is classified under tariff item 2833.29.00 as a sulfate of chromium, meeting the inorganic chemical definition of Chapter 28.
2833.29.00Chromic Sulfate Anhydrous
Anhydrous chromic sulfate (Cr2(SO4)3) is used in pyrotechnics and high-temperature ceramics. It is a pure inorganic chromium sulfate under tariff item 2833.29.00, distinguished by lack of crystal water and appearing as a dark green powder.
2833.29.00Chromium Ammonium Sulfate
Chromium ammonium sulfate serves as a precursor in catalyst production and analytical standards. It is classified under tariff item 2833.29.00 as a chromium sulfate, though ammonium complexes border on heading 28.42. It is a green crystalline material.
2833.29.00Chromium(III) Sulfate Pentahydrate
Chromium(III) sulfate pentahydrate is an inorganic salt consisting of chromium cations and sulfate anions, typically appearing as a blue-green crystalline powder. It falls under tariff item 2833.29.00 as a sulfate of chromium, being a chemically defined compound.
2833.29.00Chromium Potassium Sulfate Dodecahydrate
Chromium potassium sulfate dodecahydrate, also known as chrome alum, is a double salt used in analytical chemistry and trivalent chromium plating baths. It qualifies under tariff item 2833.29.00 as a sulfate of chromium, though it is borderline with heading 28.42 for complex salts.
2833.29.00Chromium(VI) Sulfate
Chromium(VI) sulfate, or chromic acid sulfate, is a strong oxidizing agent used in chromium electroplating and corrosion inhibitors. It is classified as a sulfate of chromium under tariff item 2833.29.00, meeting the chemically defined inorganic compound criteria.
2833.29.00Cobalt Ammonium Sulfate
Cobalt ammonium sulfate (CoSO4·(NH4)2SO4·6H2O) is a double salt of cobalt and ammonium sulfate used in analytical labs and plating. As a double salt, it is classified under heading 28.42 per Chapter Note 5, but as a sulfate of cobalt, it falls under tariff item 2833.29.00.
2833.29.00Cobalt(II) Sulfate Heptahydrate
Cobalt(II) sulfate heptahydrate (CoSO4·7H2O) is a pink crystalline salt used in electroplating baths and as a cobalt source in fertilizers. It falls under tariff item 2833.29.00 as a sulfate of cobalt.
2833.29.00Cobalt Sulfate for Electroplating
High-purity cobalt sulfate crystals for decorative and engineering electroplating baths. This is a pure cobalt sulfate salt used in metal finishing, classified under tariff item 2833.29.00 as an 'Other' sulfate.
2833.29.00Cobalt Sulfate Heptahydrate
Cobalt sulfate heptahydrate is a chemically defined salt used in pigments, catalysts, and lithium-ion battery precursors. It is classified under tariff item 2833.29.00 as an 'other sulfate' of cobalt, not specifically provided for elsewhere.
2833.29.00Cobalt Sulfate Monohydrate
Cobalt sulfate monohydrate (CoSO4·H2O) is a red powder applied in animal feed supplements and ceramic pigments. It is a chemically defined sulfate of cobalt, classified under tariff item 2833.29.00.
2833.29.00Copperas Crystals (Ferrous Sulfate)
Copperas, or green vitriol, refers to large crystals of ferrous sulfate heptahydrate used in gardening and pigment production. It is classified under tariff item 2833.29.00 as an 'Other' sulfate of iron.