Aluminum Potassium Sulfate (Potash Alum) from Canada
Aluminum potassium sulfate, or potash alum, is used in water purification, baking powder, and as an astringent. Technically a double salt, pure forms not meeting alum definitions classify under HTS 2833.29.51.
Duty Rate — Canada → United States
3.7%
Rate breakdown
9903.05.860%Universal product exemption (U.S. note 52(b))
Import Tips
• Molecular weight analysis to confirm if double salt qualifies for 2833.30
• Food contact notifications required for baking powder applications
• Bulk vs retail packaging affects potential Chapter 21 reclassification