U.S. imports of Dimethyl Methylphosphonate (DMMP) (HS 293141) totaled $87K in September 2026, imported from 3 countries.
Importers of Dimethyl Methylphosphonate (DMMP) paid $12K in duties in September 2026, an average duty rate of 13.70% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Dimethyl Methylphosphonate (DMMP) imports of $87K in September 2026 ran 16% above the year-to-date monthly average of $75K.
Last updated: September 2026 dataDimethyl 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.
1 import shipments a month
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.
Subheading 6 of 17 in heading 2931
Subheading 293141 · $87K of $107.2M
ImportsExports
Imports
$87KYoY · free account
Exports
—YoY · free account
Low of 9 reported months · imports
Low · free accountFewer than 6 of the last 12 months reported trade, or the latest month was under $500K; the trend chart is not shown for thin series.
Through September 2026 · imports 9 of 12 months reported, exports 7 of 12 months reported. Source: U.S. Census Bureau.
Trade Directory
List your company under HS 293141 — Dimethyl Methylphosphonate (DMMP), so the companies trading it can find you. Be the first supplier listed.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 2931410000 | Org-Phos Drtvs:dimethyl Methylphosphonate | $99K | 40.54% | 100.00% | $40K |
Imports · September 2026
origin
India and Switzerland together supply 100% of it.
customs district
destination
entry
rate provision · imports
duty collected equals 13.70% of imports for consumption.