Methylphosphonic Acid Mixture from Canada
A stabilized mixture primarily of methylphosphonic acid used in chemical synthesis and as a precursor for phosphonate-based water treatment agents. Classified under HTS 3824.99.93.61 due to its main component being phosphorus bonded solely to a methyl group without additional carbon attachments. This preparation is common in industrial chemical supply chains.
Duty Rate — Canada → United States
65%
Rate breakdown
9903.03.1450%Articles the product of Canada as provided in subdivision (b)(3) of U.S. note 51 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
• Provide detailed compositional analysis showing >50% content of the specified phosphorus structure to justify classification
• Comply with REACH-like declarations if transshipping from EU; US importers need proper hazardous material labeling
• Watch for auto-reclassification to waste streams if concentration indicates unfit for use, per Chapter 38 notes