Methanesulfinic Acid Sodium Salt from Canada
Sodium methanesulfinate (CH₃S(O)ONa) is the sodium salt of methanesulfinic acid, classified under HTS 2930.90.4950 per Chapter 29 note 4(C)(1). Contains sulfur directly linked to carbon via sulfinic acid function; distinguished from sulfonic acids. Used as reducing agent in organic synthesis.
Duty Rate — Canada → United States
110%
Rate breakdown
9903.04.6095.8%Except as provided in heading 9903.04.61, patented pharmaceutical articles as provided for in subdivisions (c) and (d) of U.S. note 40 to this subchapter
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
• Submit counterion analysis confirming sodium content per salt classification rules
• Include oxidation state confirmation (S(IV) vs S(VI) sulfonic acids)
• Hygroscopic; specify moisture content <5% in COA