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HSChapter 39
U.S. imports of polyethers (other), primary forms (HS 390729) totaled $48.5M in April 2026, traded with 36 countries.
Importers of Polyethers (Other), Primary Forms paid $7.0M in duties in April 2026 — an effective duty rate of 17% on $42.1M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 2026 dataPolyethers not elsewhere specified—classified under a single 10-digit line (3907290000)—encompass a broad family of polymer intermediates including polyols used in polyurethane foam, elastomers, and sealant systems. South Korea and Germany are the top US import sources, with Japan and Canada also contributing. The breadth of this residual category means that classification disputes are common when a product could plausibly fall under a more specific polyether subheading; importers should document the polymer's backbone chemistry carefully. Polyether polyols for flexible and rigid foam applications represent the commercially dominant segment within this heading.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
The key is to check whether the product meets the specific structural definitions of 3907.10 (polyacetals), 3907.21 (bis(polyoxyethylene) methylphosphonate), or other named subheadings first. Only polyethers that do not satisfy any of those specific descriptions fall into the NESOI line 3907290000. Molecular structure documentation and CAS numbers are essential for making this determination.
South Korea is a US free-trade-agreement partner under KORUS, and qualifying originating goods may be eligible for preferential tariff treatment. Importers must obtain a valid certificate or certification of origin and confirm that the product meets KORUS rules of origin before claiming the preference.
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| Country | Imports | Exports | Balance |
|---|---|---|---|
| CANADA | $5.1M | $19.9M | +$14.7M |
| INDIA | $177K | $21.2M | +$21.0M |
| MEXICO | $1.3M | $18.9M | +$17.6M |
| KOREA, SOUTH | $13.7M | $1.8M | -$11.9M |
| CHINA | $4.5M | $6.2M | +$1.7M |
Monthly import values over time
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 3907290000 | POLYETHERS, NESOI | $48.5M | 16.69% | $7.0M |
POLYETHERS, NESOI
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3907290000 | POLYETHERS, NESOI | $110.8M |
POLYETHERS, NESOI
25.6M kg
ARTICLES OF PLASTICS, NESOI
HS 392690
FLOOR, WALL, ETC COVERS, VINYL CHLORIDE POLYMERS
HS 391810
TABLEWARE AND KITCHENWARE OF PLASTICS
HS 392410
SACKS & BAGS (INCL CONES) OF POLYMERS OF ETHYLENE
HS 392321
HOUSEHOLD AND TOILET ARTICLES NESOI OF PLASTICS
HS 392490
PLATES, SHEETS ETC, NON-CELL ETC, POLYMER
HS 392010
| State | Imports | Exports | Balance |
|---|---|---|---|
| Texas | $8.0M | $20.5M | +$12.5M |
| New York | $1.5M | $18.5M | +$17.0M |
| Connecticut | $498K | $18.7M | +$18.2M |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| NEW YORK, NY | -- | $36.1M | +$36.1M |
| HOUSTON, TX | $4.3M | $11.7M | +$7.4M |
| LAREDO, TX | $1.2M | $12.2M | +$11.0M |