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HSChapter 39
U.S. imports of poly(1,3-phenylene methylphosphonate) in primary forms (HS 391120) totaled $322K in June 2026, traded with 4 countries.
Importers of Poly(1,3-Phenylene Methylphosphonate) in Primary Forms paid $45K in duties in June 2026 — an effective duty rate of 14% on $322K in dutiable value, based on actual customs collections rather than the published tariff schedule. Poly(1,3-Phenylene Methylphosphonate) in Primary Forms imports of $322K in June 2026 ran 166% above the year-to-date monthly average of $121K.
Last updated: June 2026 dataPoly(1,3-phenylene methylphosphonate) is a phosphorus-containing flame-retardant polymer used primarily as a reactive additive in engineering plastics and fiber applications where halogen-free fire performance is required. France is the leading US supplier of this specialty polymer, reflecting the concentration of phosphonate chemistry expertise among European specialty chemical producers. Because the product falls under a dedicated 10-digit line (3911200000), classification is straightforward, but importers should confirm the polymer's degree of polymerization and primary-form status to avoid reclassification into downstream articles.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Customs authorities look for evidence that the material is an unfinished polymer intermediate — typically a technical data sheet showing it is supplied as granules, powder, or solution without further fabrication. A certificate of analysis confirming molecular weight range and the absence of compounded additives that would constitute a finished article strengthens the primary-form classification.
It functions primarily as a reactive flame retardant in polyester and polyamide fibers and in engineering thermoplastics for electrical and electronic components. Its phosphorus content provides durable, non-leaching fire resistance, which is increasingly preferred over additive-type halogenated retardants in regulated markets.
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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 | Duty Collected |
|---|---|---|---|---|---|
| 3911200000 | POLY(1,3-PHENYLENE METHYLPHOSPHONATE) | $322K | 13.99% | 100.00% | $45K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3911200000 | POLY(1,3-PHENYLENE METHYLPHOSPHONATE) | $45K |
ARTICLES OF PLASTICS, NESOI
HS 392690
TABLEWARE AND KITCHENWARE OF PLASTICS
HS 392410
FLOOR, WALL, ETC COVERS, VINYL CHLORIDE POLYMERS
HS 391810
HOUSEHOLD AND TOILET ARTICLES NESOI OF PLASTICS
HS 392490
SACKS & BAGS (INCL CONES) OF POLYMERS OF ETHYLENE
HS 392321
ETHYLENE-ALPHA-OLEFIN COPOLY, SPC GRAVITY <0.94
HS 390140
| Port | Imports | Exports | Balance |
|---|---|---|---|
| NEWARK, NJ | $241K | -- | -$241K |
| WASHINGTON, DC | $81K | -- | -$81K |
| HILDAGO, TX | -- | $41K | +$41K |