Aluminum Ammonium Sulfate (Ammonium Alum) from Canada
Aluminum ammonium sulfate (NH4Al(SO4)2·12H2O), known as ammonium alum, is used as a mordant in dyeing and baking powder. As a salt of aluminum, it falls under HTS 2833.22.00.00 per heading scope for aluminum sulfates.
Duty Rate — Canada → United States
10%
Rate breakdown
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• Disclose full chemical formula on labels to avoid double-salt confusion; GRAS status for food use requires specific documentation; test for ammonia content