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HSChapter 29
U.S. exports of methylphosphonic acid (HS 293144) totaled $7K in June 2026, traded with 1 country.
Methylphosphonic acid (MPA) is a key organophosphorus compound and a direct hydrolysis product of certain nerve agents, making it a closely monitored chemical under the Chemical Weapons Convention's Schedule 2 list. In legitimate commerce, it serves as an intermediate in the synthesis of flame retardants, herbicides, and specialty phosphonate chemicals. Germany is the leading — and apparently sole — recorded US supplier for this heading, classified under HTS line 2931440000. Importers must be prepared for rigorous end-use certification and potential BIS review.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Methylphosphonic acid is a Schedule 2 chemical under the Chemical Weapons Convention because it is a hydrolysis product and synthetic precursor associated with certain nerve agents. This status triggers enhanced end-use verification requirements and potential BIS review for all import transactions.
Legitimate applications include use as a synthetic intermediate for organophosphonate flame retardants, agricultural chemical synthesis, and specialty chemical research. Importers must clearly document the specific end use to satisfy customs and regulatory requirements.
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Monthly import values over time
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 |
|---|---|---|---|---|
| 2931440000 | METHYLPHOSPHONIC ACID | $0 | -- | -- |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2931440000 | METHYLPHOSPHONIC ACID | $7K |
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
| Country | Imports | Exports | Balance |
|---|---|---|---|
| CANADA | -- | $7K | +$7K |
| DOMINICAN REPUBLIC | -- | -- | -- |
| GERMANY | -- | -- | -- |
| State | Imports | Exports | Balance |
|---|---|---|---|
| Pennsylvania | -- | $7K | +$7K |
| Utah | -- | -- | -- |
| South Carolina | -- | -- | -- |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| BUFFALO-NIAGARA FALLS, NY | -- | $7K | +$7K |
| HOUSTON, TX | -- | -- | -- |
| PORT HURON, MI | -- | -- | -- |