Ferric Ammonium Sulfate
Ferric ammonium sulfate ((NH4)Fe(SO4)2·12H2O) is used in analytical chemistry and as a mordant in dyeing. It qualifies under HTS 2833.29.20.00 as a sulfate of iron, treated as a metal salt per Chapter 28 notes on complex salts.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If classified as a complex double salt
Ammonium-iron double sulfates may fall under 2842 for complex salts.
If when used as synthetic organic dye mordant
Dye intermediates or mordants shift to Chapter 32.
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Import Tips & Compliance
• Declare as 'of iron' emphasizing the iron component to align with subheading
• Include REACH or TSCA registration if for lab/research import into US
• Prevent moisture absorption with desiccants to avoid hydrate state changes
Related Products under HTS 2833.29.20.00
Ferrous Sulfate Heptahydrate
Ferrous sulfate heptahydrate (FeSO4·7H2O) is a pale green crystalline compound used primarily as a nutrient supplement in agriculture and water treatment. It falls under HTS 2833.29.20.00 as a sulfate of iron, specifically classified among other iron sulfates due to its chemical definition as an inorganic iron salt.
Ferric Sulfate Anhydrous
Ferric sulfate (Fe2(SO4)3) in anhydrous form is a yellow to brown powder used in water purification and as a coagulant. Classified under HTS 2833.29.20.00 as an other sulfate of iron, meeting Chapter 28 criteria for chemically defined inorganic iron compounds.
Iron(II) Sulfate Monohydrate
Iron(II) sulfate monohydrate (FeSO4·H2O), also known as melanterite, serves as a reducing agent and iron supplement in animal feed. It is classified under HTS 2833.29.20.00 for iron sulfates, excluding those specified elsewhere in the chapter.
Copperas Crystals (Ferrous Sulfate)
Copperas, or green vitriol, refers to large crystals of ferrous sulfate heptahydrate used in gardening and pigment production. Classified in HTS 2833.29.20.00 as other sulfates of iron, distinct from alums.
Iron(III) Sulfate Solution (45% Fe2(SO4)3)
A 45% aqueous solution of iron(III) sulfate used in wastewater treatment and etching. Though a solution, it remains under HTS 2833.29.20.00 when chemically defined as iron sulfate concentrate.
Ferrous Sulfate Granules for Agriculture
Granulated ferrous sulfate heptahydrate designed for soil amendment to correct iron deficiencies in crops. Falls under HTS 2833.29.20.00 as a pure iron sulfate, not yet a formulated fertilizer.