2931.49.00.55/Dimethyl Methylphosphonate (DMMP)/Canada

Dimethyl Methylphosphonate (DMMP) from Canada

DMMP is an organophosphorus compound with the formula CH3PO(OCH3)2, featuring a phosphorus atom bonded to one methyl group and two methoxy groups. It falls under HTS 2931.49.0055 as a non-halogenated organo-phosphorus derivative with exactly one methyl group directly attached to phosphorus and no further carbon atoms beyond that group and the methoxy substituents. Commonly used as a flame retardant additive and chemical intermediate.

Duty Rate — Canada → United States

100%

Rate breakdown

9903.04.6096.3%Pharmaceuticals Annex IV: patented pharma articles — 100% floor rate

9903.05.900%Articles already subject to Section 232 (steel/aluminum/copper + derivatives, autos + parts, wood, medium/heavy vehicles + parts, semiconductors, patented pharma) — U.S. note 52(f)

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Import Tips

• Provide detailed chemical analysis (NMR, GC-MS) confirming the phosphorus-methyl bond and absence of additional carbon chains to verify classification

• Include Safety Data Sheets (SDS) and end-use declarations, as DMMP has potential dual-use applications requiring export control compliance

• Ensure packaging complies with DOT/UN hazardous materials regulations for flammable liquids