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.
Subheading 11 of 17 in heading 2931
Trade Directory
List your company under HS 293144 — Methylphosphonic Acid, 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 |
|---|---|---|---|---|
| 2931440000 | Methylphosphonic Acid | — | -- | -- |
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 | $114K |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
Imports · September 2026
origin
customs district
destination
entry
rate provision · imports
None recorded for this period.
ImportsExports
Imports
—YoY · free account
Exports
—YoY · free account
Low of 1 reported month · 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 1 of 12 months reported, exports 7 of 12 months reported. Source: U.S. Census Bureau.