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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If thiosulfate instead of sulfite
Thiosulfates are in a separate subheading 2832.30.00 within the same hierarchy.
If complex salt with silver or other metals
Complex sulfites of inorganic bases fall under 2842 per Chapter 28 notes on double salts.
If for boiler water treatment preparations
Commercial oxygen scavenger blends are classified as chemical preparations in 3824.
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Import Tips & Compliance
• Include stability data in documentation; solutions may require UN hazmat certification for transport
• Label concentration precisely (e.g
• 40% w/v); discrepancies lead to reclassification as mixtures
• Obtain prior EPA notification if used in US water systems; import permits may apply for large volumes
Related Products 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.
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.