2930.90.92.25/Dimethyl Methylphosphonate (DMMP)/China

Dimethyl Methylphosphonate (DMMP) from China

Dimethyl methylphosphonate is an organophosphorus compound with the formula CH3P(O)(OCH3)2, containing a phosphorus atom bonded to one methyl group and two methoxy groups with no other carbon atoms directly attached to phosphorus. It falls under HTS 2930.90.9225 as it precisely matches the chemical structure specified for phosphorus compounds with one methyl group. Commonly used as a flame retardant and chemical intermediate.

Duty Rate — China → 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 certificates (CAS# 756-79-6) confirming the exact molecular structure to verify classification under 2930.90.9225

• Ensure SDS includes phosphorus bonding structure; misclassification as general organophosphorus (2931.00) is common without proof

• Declare purity levels accurately as impurities may trigger reclassification if exceeding chapter note tolerances