Ammonium Dithionite Solution from China
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.
Duty Rate — China → United States
40.5%
Rate breakdown
9903.03.0110%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
9903.88.0325%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)
Import Tips
• 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