Other sulphites
Sulphites; thiosulphates. > Other sulphites > Other sulphites
Duty Rate (from China)
Subheadings
Products classified under Tariff item 2832.20.00
Ammonium 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'.
Barium 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.
Calcium 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'.
Cobalt 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.
Copper 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'.
Ferrous 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'.
Lithium 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'.
Magnesium 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'.
Manganese 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'.
Nickel 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.
Potassium 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.
Silver 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'.
Sodium 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.
Strontium 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.
Zinc 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.