2831.90.00.00/Sodium Dithionite/Mexico

Sodium Dithionite from Mexico

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.

Duty Rate — Mexico → United States

15.5%

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

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Import Tips

• Verify purity and chemical identity via Certificate of Analysis to confirm classification as chemically defined dithionite under Chapter 28 notes

• Ensure proper hazardous material declaration (UN1384) and packaging compliant with DOT/IMDG for reducing agents

• Avoid misclassification as organic derivatives; check for organic stabilizers which shift to specific stabilized subheadings