Chapter 2832 — Customs Tariff Headings
Products classified under Tariff item 28.32
Food-Grade Sodium Sulfite Crystals
Food-grade sodium sulfite crystals meeting FCC standards, used as a preservative in dried fruits, wines, and seafood. This chemically defined sodium sulfite (Na2SO3) falls under tariff item 2832.10.00, which covers sodium sulphites in Chapter 28.
2832.10.00Industrial Sodium Sulfite Flakes
Industrial sodium sulfite flakes used in textile bleaching and photography developers as a reducing agent. As a chemically defined sodium sulfite, it is classified under tariff item 2832.10.00 for sodium sulphites.
2832.10.00Pharmaceutical Grade Sodium Sulfite USP
Pharmaceutical-grade sodium sulfite powder conforming to USP standards, used as an excipient and antioxidant in drug formulations. This chemically defined compound is classified under tariff item 2832.10.00 for sodium sulphites.
2832.10.00Photography Developer Sodium Sulfite
Fine powder sodium sulfite used in black-and-white film developers to prevent oxidation. As a pure inorganic sodium salt, it is classified under tariff item 2832.10.00 for sodium sulphites.
2832.10.00Sodium Sulfite Anhydrous Powder
Pure anhydrous sodium sulfite (Na2SO3) in fine powder form, used as a reducing agent and antioxidant in chemical manufacturing. This chemically defined compound is classified under tariff item 2832.10.00 for sodium sulphites.
2832.10.00Sodium Sulfite for Wine Preservation
Granular sodium sulfite specifically for winemaking to prevent oxidation and microbial growth. As a chemically defined sodium sulfite, it falls under tariff item 2832.10.00 for sodium sulphites.
2832.10.00Sodium Sulfite Meta Bisulfite Precursor
High-purity sodium sulfite granules used as a precursor for sodium metabisulfite production in food and pharmaceutical industries. This chemically defined Na2SO3 is classified under tariff item 2832.10.00 for sodium sulphites.
2832.10.00Technical Grade Sodium Sulfite Solution 40%
Aqueous solution containing 40% sodium sulfite by weight, used in water treatment and paper pulping as an oxygen scavenger. As a solution of a chemically defined sodium sulfite, it qualifies for tariff item 2832.10.00 under Chapter note 1(b).
2832.10.00Textile Bleaching Sodium Sulfite
Coarse sodium sulfite for vat dyeing and bleaching in the textile industry as a reducing agent. This chemically defined sodium sulfite is classified under tariff item 2832.10.00 for sodium sulphites.
2832.10.00Water Treatment Sodium Sulfite Pellets
Pelletized sodium sulfite for boiler water deoxygenation in industrial cooling systems. As a chemically defined sodium sulfite, it is classified under tariff item 2832.10.00 for sodium sulphites.
2832.20.00Ammonium Sulfite Solution 40%
A 40% aqueous solution of ammonium sulfite ((NH4)2SO3), used in wastewater treatment and as an oxygen scavenger. This solution is a separate chemically defined compound dissolved in water, meeting the requirements of Chapter 28 Note 1(b), and falls under tariff item 2832.20.00 as an 'other sulphite'.
2832.20.00Barium Sulfite Precipitated
Precipitated barium sulfite (BaSO3), a chemically defined inorganic compound used in X-ray contrast media and pigments. It qualifies as an 'other sulphite' under tariff item 2832.20.00, as it is not excluded by Chapter 28 notes.
2832.20.00Calcium Sulfite Hemihydrate
Calcium sulfite hemihydrate (CaSO3·0.5H2O), a white powder byproduct from flue gas desulfurization used in construction materials. As a chemically defined compound of an inorganic base, it falls under tariff item 2832.20.00 as an 'other sulphite'.
2832.20.00Cobalt Sulfite
Cobalt sulfite, a chemically defined metal sulfite used in catalyst preparation and plating baths. It is classified under tariff item 2832.20.00 as an 'other sulphite' of an inorganic base, consistent with Chapter 28.
2832.20.00Copper Sulfite Basic
Basic copper sulfite, a copper salt of sulfurous acid used in fungicide synthesis. It is a chemically defined inorganic compound and falls under tariff item 2832.20.00 as an 'other sulphite'.
2832.20.00Ferrous Sulfite Crystals
Ferrous sulfite (FeSO3) crystals, employed in analytical chemistry and reducing applications. This chemically defined iron sulfite meets the criteria for tariff item 2832.20.00 as an 'other sulphite'.
2832.20.00Lithium Sulfite Anhydrous
Anhydrous lithium sulfite (Li2SO3), used in lithium battery electrolytes. As a chemically defined alkali metal sulfite, it is classified under tariff item 2832.20.00 as an 'other sulphite'.
2832.20.00Magnesium Sulfite Tribasic
Tribasic magnesium sulfite (Mg3(SO3)2), used in pharmaceutical buffering and flame retardants. This chemically defined sulfite salt of an inorganic base falls under tariff item 2832.20.00 as an 'other sulphite'.
2832.20.00Manganese Sulfite
Manganese(II) sulfite, used in ceramic glazes and catalysts. As a metal sulfite, it is a chemically defined inorganic compound and is classified under tariff item 2832.20.00 as an 'other sulphite'.
2832.20.00Nickel Sulfite Tetrahydrate
Nickel sulfite tetrahydrate (NiSO3·4H2O), used in electroplating. This chemically defined nickel salt falls under tariff item 2832.20.00 as an 'other sulphite' of an inorganic base.
2832.20.00Potassium Sodium Sulfite
Potassium sodium sulfite (KNaSO3), a double salt used in textile bleaching. Under Chapter 28 Note 5, double salts are classified in heading 28.42 unless the context requires otherwise; however, as a sulfite, it is specifically covered by heading 28.32 and thus falls under tariff item 2832.20.00.
2832.20.00Silver Sulfite
Silver sulfite (Ag2SO3), used in photographic chemicals. As a chemically defined compound of a precious metal, it is not excluded by Chapter 28 notes and falls under tariff item 2832.20.00 as an 'other sulphite'.
2832.20.00Sodium Sulfite Anhydrous
Sodium sulfite anhydrous (Na2SO3), a white crystalline powder used as a reducing agent and preservative. While sodium sulfite is a common 'other sulphite', it is classified under tariff item 2832.20.00, as there is no separate tariff item for sodium sulfite in this subheading.
2832.20.00Strontium Sulfite Powder
Strontium sulfite (SrSO3) powder, used in pyrotechnics and specialty ceramics. As a chemically defined sulfite of an alkaline earth metal, it falls under tariff item 2832.20.00 as an 'other sulphite', and is not excluded by Chapter 28 notes.
2832.20.00Zinc Sulfite Powder
Zinc sulfite (ZnSO3) powder, used in specialty chemical synthesis and as a corrosion inhibitor. This chemically defined metal sulfite qualifies under tariff item 2832.20.00 as an 'other sulphite' of an inorganic base.
2832.30.00Ammonium Thiosulfate Solution
Ammonium thiosulfate ((NH4)2S2O3) in aqueous solution, used as a fertilizer additive and in gold leaching. It is a chemically defined thiosulfate of ammonium, classifiable under this tariff item as a thiosulphate.
2832.30.00Anhydrous Sodium Thiosulfate Powder
Anhydrous sodium thiosulfate (Na2S2O3) in white powder form, a separate chemically defined compound of sodium. It is used in gold extraction and as a dechlorinator in water treatment, and qualifies under tariff item 2832.30.00 as a thiosulphate.
2832.30.00Aquarium Dechlorinator Sodium Thiosulfate
Concentrated sodium thiosulfate solution crystals for aquarium dechlorination, consisting of the pure sodium thiosulfate salt. Despite its retail purpose, it remains a chemically defined thiosulfate of sodium, classifiable under this tariff item.
2832.30.00Barium Thiosulfate Anhydrous
Barium thiosulfate (BaS2O3) anhydrous, a specialty chemical for pyrotechnics and analytical reagent use. It is a chemically defined thiosulfate of barium, falling under this tariff item as a thiosulphate.
2832.30.00Calcium Thiosulfate Powder
Calcium thiosulfate (CaS2O3) powder, used in rubber processing and wastewater treatment. It is a chemically defined thiosulfate of calcium, classifiable under this tariff item as a thiosulphate.
2832.30.00Gold Mining Sodium Thiosulfate Extractant
Technical grade sodium thiosulfate used as a lixiviant in gold leaching processes, a chemically defined compound of sodium. Its industrial application does not alter its classification as a thiosulphate under this tariff item.
2832.30.00Industrial Grade Sodium Thiosulfate Flakes
Sodium thiosulfate flakes for industrial applications such as paper bleaching and leather tanning, acting as an antichlor agent. It is a chemically defined sodium thiosulfate, falling under this tariff item as a thiosulphate.
2832.30.00Lab Reagent Sodium Thiosulfate 0.1N Solution Powder
Pre-weighed sodium thiosulfate for preparing 0.1N titrant solutions in analytical chemistry, a pure chemically defined compound. It is classifiable under this tariff item as a thiosulphate, regardless of its laboratory use.
2832.30.00Magnesium Thiosulfate Solution 30%
30% magnesium thiosulfate solution (MgS2O3) for agricultural and textile applications. It is a chemically defined thiosulfate of magnesium in aqueous solution, classifiable under this tariff item as a thiosulphate.
2832.30.00Pharmaceutical Grade Sodium Thiosulfate USP
USP-grade sodium thiosulfate meeting pharmacopeia standards for medicinal use as an antidote. It is a chemically defined compound of sodium, classifiable under this tariff item as a thiosulphate, even though it is for pharmaceutical purposes.
2832.30.00Potassium Thiosulfate Crystals
Potassium thiosulfate (K2S2O3) crystals, used as an analytical reagent and in aquaculture dechlorination. It is a chemically defined thiosulfate of potassium, falling under this tariff item as a thiosulphate.
2832.30.00Sodium Thiosulfate for Photographic Fixing
High-purity sodium thiosulfate for photographic fixing, used as a hypo fixer to dissolve silver halides. It is a chemically defined sodium thiosulfate, classifiable under this tariff item as a thiosulphate.
2832.30.00Sodium Thiosulfate Pentahydrate
Sodium thiosulfate pentahydrate (Na2S2O3·5H2O), a colorless crystalline compound for photography and water treatment. It is a chemically defined thiosulfate of sodium, classifiable under this tariff item as a thiosulphate.
2832.30.00Sodium Thiosulfate Pentahydrate Crystals
Sodium thiosulfate pentahydrate crystals (Na2S2O3·5H2O), a separate chemically defined compound used in photography and water treatment. It falls under this tariff item as a thiosulphate of sodium.
2832.30.00Zinc Thiosulfate Hydrate
Zinc thiosulfate hydrate (ZnS2O3·H2O), used as a corrosion inhibitor and in photographic developers. It is a chemically defined thiosulfate of zinc, classifiable under this tariff item as a thiosulphate.