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HSChapter 39
U.S. imports of bis(polyoxyethylene) methylphosphonate, primary forms (HS 390721) totaled $197K in June 2026, traded with 12 countries.
Importers of Bis(Polyoxyethylene) Methylphosphonate, Primary Forms paid $6K in duties in June 2026 — an effective duty rate of 9.5% on $66K in dutiable value, based on actual customs collections rather than the published tariff schedule. Bis(Polyoxyethylene) Methylphosphonate, Primary Forms imports of $197K in June 2026 ran 116% above the year-to-date monthly average of $91K.
Last updated: June 2026 dataBis(polyoxyethylene) methylphosphonate is a phosphorus-containing polyether used primarily as a flame-retardant additive and reactive intermediate in polyurethane and polyester formulations. Germany and Japan are the leading US import sources for this specialty chemical, reflecting the concentration of fine-chemical and phosphonate synthesis capacity in those countries. Classified under a single 10-digit line (3907210000), the product's phosphonate functionality can trigger additional scrutiny under chemical import regulations, and importers should ensure accurate CAS number documentation to avoid misclassification with structurally similar polyethers.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
The 2017 HS revision created a dedicated subheading (390721) for this specific phosphonate-functionalized polyether to improve statistical tracking of flame-retardant intermediates and to distinguish it from non-phosphorus polyethers classified under 390729. The structural specificity—a methylphosphonate group flanked by two polyoxyethylene chains—is the defining classification criterion.
Importers should provide the supplier's certificate of analysis including the CAS number, molecular structure diagram, and phosphorus content. Because the compound sits at the boundary between polyethers (3907.21) and organophosphorus chemicals (Chapter 29), a binding ruling from CBP can provide certainty, particularly for high-volume shipments.
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Monthly import values over time
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 3907210000 | BIS(POLYOXYETHYLENE) METHYLPHOSPHONATE | $197K | 3.18% | 33.53% | $6K |
BIS(POLYOXYETHYLENE) METHYLPHOSPHONATE
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3907210000 | BIS(POLYOXYETHYLENE) METHYLPHOSPHONATE | $1.3M |
BIS(POLYOXYETHYLENE) METHYLPHOSPHONATE
470.8K kg
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
| State | Imports | Exports | Balance |
|---|---|---|---|
| Texas | $13K | $337K | +$324K |
| Illinois | $47K | $204K | +$158K |
| New Jersey | -- | $158K | +$158K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| LAREDO, TX | $106K | $526K | +$420K |
| YSLETA, TX | -- | $98K | +$98K |
| HILDAGO, TX | $13K | $77K | +$64K |