3824.99.93.61/Dimethyl Methylphosphonate (DMMP)/Japan

Dimethyl Methylphosphonate (DMMP) from Japan

DMMP is an organophosphorus compound used as a flame retardant additive and chemical intermediate in flameproof coatings and plastics. It falls under HTS 3824.99.93.61 because it consists mainly of chemicals containing a phosphorus atom bonded to one methyl group with no other carbon atoms directly attached beyond that. This specific mixture classification applies to its use in industrial chemical preparations.

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

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Import Tips

• Verify chemical purity and composition via lab analysis to confirm it meets the phosphorus-methyl bonding criteria for this subheading

• Include Safety Data Sheets (SDS) and TSCA certification, as organophosphorus compounds may trigger EPA import notifications

• Avoid misclassification as pesticide intermediates; ensure documentation specifies industrial chemical use to prevent delays