Methylphosphonic Acid Mixture from Japan
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 — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of Japan, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 12.5 percent, 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