Zinc Dithionite from Mexico
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.
Duty Rate — Mexico → United States
15.5%
Rate breakdown
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Provide assay reports confirming dithionite content >90% to avoid reclassification as mixtures under Chapter 38
• Comply with EPA TSCA registration for new chemical substances if not previously imported
• Label as 'corrosive to metals' per GHS; ensure UN-approved packaging for transoceanic shipment