Other sulfites
Sulfites; thiosulfates: > Other sulfites
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Products classified under HTS 2832.20.00.00
Sodium Sulfite Anhydrous
Sodium sulfite (Na2SO3) in anhydrous form is a white crystalline powder used as a reducing agent and preservative. It falls under HTS 2832.20.00.00 as one of the 'other sulfites' excluding sodium and potassium sulfites, which are specified separately in the tariff schedule.
Ammonium Sulfite Solution 40%
A 40% aqueous solution of ammonium sulfite ((NH4)2SO3) used in wastewater treatment and as an oxygen scavenger. Classified under HTS 2832.20.00.00 as an 'other sulfite' of an inorganic base, meeting Chapter 28 definitions for chemically defined compounds.
Zinc Sulfite Powder
Zinc sulfite (ZnSO3) powder used in specialty chemical synthesis and as a corrosion inhibitor. It qualifies under HTS 2832.20.00.00 as a sulfite of an inorganic base (metal salt), distinct from chromates or other excluded compounds.
Calcium Sulfite Hemihydrate
Calcium sulfite hemihydrate (CaSO3·0.5H2O), a white powder byproduct from flue gas desulfurization, used in construction materials. Falls under HTS 2832.20.00.00 as an 'other sulfite' chemically defined per Chapter 28 Note 1.
Magnesium Sulfite Tribasic
Tribasic magnesium sulfite (Mg3(SO3)2) used in pharmaceutical buffering and flame retardants. Classified in HTS 2832.20.00.00 as a chemically defined sulfite salt of an inorganic base.
Ferrous Sulfite Crystals
Ferrous sulfite (FeSO3) crystals employed in analytical chemistry and reducing applications. Meets HTS 2832.20.00.00 criteria as an 'other sulfite' of iron, chemically defined inorganic compound.
Strontium Sulfite Powder
Strontium sulfite (SrSO3) powder for pyrotechnics and specialty ceramics. Under HTS 2832.20.00.00 as a rare earth-adjacent sulfite, excluded from radioactive elements in 2844.
Barium Sulfite Precipitated
Precipitated barium sulfite (BaSO3) used in X-ray contrast media and pigments. HTS 2832.20.00.00 applies to this chemically defined barium salt sulfite.
Potassium Sodium Sulfite
Mixed potassium sodium sulfite (KNaSO3) double salt for textile bleaching. Classified under HTS 2832.20.00.00 per Chapter Note 5 on complex salts unless specifically in 2842.
Lithium Sulfite Anhydrous
Anhydrous lithium sulfite (Li2SO3) for lithium battery electrolytes. HTS 2832.20.00.00 covers this alkali metal sulfite as chemically defined.
Manganese Sulfite
Manganese(II) sulfite used in ceramic glazes and catalysts. Falls under HTS 2832.20.00.00 as metal sulfite.
Cobalt Sulfite
Cobalt sulfite for catalyst preparation and plating baths. HTS 2832.20.00.00 classification.
Nickel Sulfite Tetrahydrate
Nickel sulfite tetrahydrate (NiSO3·4H2O) for electroplating. Chemically defined under 2832.20.00.00.
Copper Sulfite Basic
Basic copper sulfite for fungicide synthesis. HTS 2832.20.00.00.
Silver Sulfite
Silver sulfite (Ag2SO3) for photographic chemicals. Precious metal compound under 2832.20.00.00.