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HSChapter 29
U.S. imports of dimethyl methylphosphonate (dmmp) (HS 293141) totaled $99K in June 2026, traded with 2 countries.
Importers of Dimethyl Methylphosphonate (DMMP) paid $38K in duties in June 2026 — an effective duty rate of 39% on $99K in dutiable value, based on actual customs collections rather than the published tariff schedule. Dimethyl Methylphosphonate (DMMP) imports of $99K in June 2026 ran 42% above the year-to-date monthly average of $70K.
Dimethyl methylphosphonate (DMMP), classified under a single dedicated line (2931410000), is an organophosphorus compound used as a flame retardant intermediate, hydraulic fluid additive, and chemical synthesis building block — but it is also a Schedule 2 precursor under the Chemical Weapons Convention, subjecting US imports to mandatory BIS CWCR declaration requirements. China dominates supply, with India and Switzerland also exporting to the US market. Given the dual-use sensitivity and the narrow supplier base, importers must file advance CWC declarations and maintain detailed end-use records; consulting a customs broker experienced in chemical controls is essential before the first shipment.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
As a Schedule 2 chemical under the Chemical Weapons Convention, DMMP imports require advance declaration to the Commerce Department's Bureau of Industry and Security under the Chemical Weapons Convention Regulations (15 CFR Part 712). Importers must submit declarations before each shipment and maintain records of the quantity imported and its end use. Non-compliance can result in civil penalties and shipment seizure.
Yes — DMMP is subject to EPA TSCA Section 13 import certification requirements regardless of end use. Additionally, EPA has conducted TSCA risk evaluations on certain organophosphate flame retardants, and importers should monitor EPA's TSCA work plan for any emerging restrictions or significant new use rules (SNURs) that could affect DMMP's admissibility or permissible applications in the US market.
Monthly import values over time
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HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 2931410000 | ORG-PHOS DRTVS:DIMETHYL METHYLPHOSPHONATE | $99K | 38.70% | 100.00% | $38K |
NUCLEIC ACIDS & SALTS; OTHER HETEROCYCLIC CMP, NES
HS 293499
POLYPEPTIDE PROTEIN& GLYCOPROTEIN HORMONES &DERIV
HS 293719
CMPDS CONT AN UNFUSED PYRIDINE RING ETC NESOI
HS 293339
BENZENE
HS 290220
HETEROCYCLIC COMP W NITROGEN HETERO-ATM ONLY NESOI
HS 293399
HETEROCYCLIC COMP WITH UNFUSED PYRAZOLE RING NESOI
HS 293319
| State | Imports | Exports | Balance |
|---|---|---|---|
| South Carolina | $97K | -- | -$97K |
| Colorado | $2K | -- | -$2K |
| North Dakota | -- | -- | -- |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| CHARLESTON, SC | $97K | -- | -$97K |
| PORTAL, ND | $2K | -- | -$2K |
| NOGALES, AZ | -- | -- | -- |