Ferric Ammonium Alum from Mexico
Ferric ammonium alum (NH4Fe(SO4)2·12H2O) serves as a coagulant in water treatment and mordant in dyeing. HTS 2833.30.00.00 covers it as an iron-based alum.
Duty Rate — Mexico → United States
11.6%
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
Import Tips
• Ensure wastewater treatment labeling; provide iron content assay
• Pitfall: mislabeling as single ferric sulfate