Ammonium Dithionite Solution
Ammonium dithionite (NH4)2S2O4 in aqueous solution acts as a reducing bleach for textiles and paper. Falls under HTS 2831.90.00.00 as 'other' dithionites when chemically defined and not organically stabilized. Concentration typically 20-40% active ingredient for liquid handling.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If urea-stabilized liquid formulation
Organic stabilization (urea common in liquids) specifically excludes from 2831.90.
If significant organic amine content >20%
Organo-inorganic compounds excluded from Chapter 28 per chapter note 3(b).
If sold as anti-stripping agent for asphalt with additives
Preparations with specific end-uses classified by function in 3811.
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Import Tips & Compliance
• Classify as solution only if dithionite constitutes principal characteristic; otherwise, preparations in 3824
• DOT Class 8 corrosive label required; IBC totes preferred for bulk import
• Test for ammonia content to prevent reclassification as ammonium sulfite derivatives
Related Products under HTS 2831.90.00.00
Sodium Dithionite
Sodium dithionite (Na2S2O4), also known as sodium hydrosulfite, is a white crystalline powder used as a reducing agent in textile bleaching and vat dyeing processes. It falls under HTS 2831.90.00.00 as one of the 'other' dithionites specified in the chapter notes for Chapter 28. This chemically defined inorganic compound is stabilized for industrial use but classified here rather than under organic-stabilized variants.
Zinc Dithionite
Zinc dithionite (ZnS2O4) is an inorganic salt used in industrial reducing applications, particularly in pulp and paper bleaching. Classified under HTS 2831.90.00.00 as 'other' dithionites, it meets Chapter 28 requirements for chemically defined inorganic sulfur-oxygen compounds. Its metal salt nature distinguishes it from organic-stabilized forms.
Potassium Dithionite
Potassium dithionite (K2S2O4) serves as a strong reducing agent in chemical synthesis and wastewater treatment. It is categorized under HTS 2831.90.00.00 for other dithionites, as a chemically defined inorganic compound per Chapter 28 Note 1. Primarily supplied as technical grade powder for industrial applications.
Sodium Formaldehyde Sulfoxylate
Sodium formaldehyde sulfoxylate (NaHSO2·CH2O) is a sulfoxylate reducing agent used in polymerizations and dye discharge printing. Classified in HTS 2831.90.00.00 as 'other' sulfoxylates when meeting inorganic compound criteria despite formaldehyde association. Technical grade powder or dihydrate form common.