Ammonium Sulfite Solution 40% from Canada
A 40% aqueous solution of ammonium sulfite ((NH4)2SO3) used in wastewater treatment and as an oxygen scavenger. Classified under HTS 2832.20.00.00 as an 'other sulfite' of an inorganic base, meeting Chapter 28 definitions for chemically defined compounds.
Duty Rate — Canada → United States
13.1%
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
• Include stability data in documentation; solutions may require UN hazmat certification for transport
• Label concentration precisely (e.g
• 40% w/v); discrepancies lead to reclassification as mixtures
• Obtain prior EPA notification if used in US water systems; import permits may apply for large volumes