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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If ferrous sulfate
Sulfates like ferrous sulfate in 2833.21, following sulfites.
If iron chlorides
Different anion changes classification to chlorides in 2821.
If industrial iron waste containing sulfites
Ferrous waste products classified as iron scrap in Chapter 72.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Stabilize against oxidation with inert atmosphere packaging for import
• Lab-grade requires USP/ACS specs; generic grades may incur higher scrutiny
• Iron compounds trigger ITAR checks if military end-use suspected
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.
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.
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.