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HSChapter 39
U.S. exports of polyethers (other), primary forms (HS 390729) totaled $134.2M in July 2026.
Importers of Polyethers (Other), Primary Forms paid $9.9M in duties in July 2026 — an effective duty rate of 18% on $56.0M in dutiable value, based on actual customs collections rather than the published tariff schedule. Polyethers (Other), Primary Forms imports of $61.1M in July 2026 ran 20% above the year-to-date monthly average of $51.0M.
Last updated: July 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.
1.4K shipments/mo
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.
Subheading 2 of 11 in heading 3907
Subheading 390729 · $61.1M of $421.1M
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ImportsExports
Imports
$61.1MYoY · Pro
Exports
$134.2MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
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 |
|---|---|---|---|---|---|
| 3907290000 | Polyethers, NESOI | $61.1M | 16.14% | 91.68% | $9.9M |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3907290000 | Polyethers, NESOI | $134.2M |
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.
Exports · July 2026
destination
customs district
origin
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rate provision · imports
8.6% enters free of duty; the effective duty rate is 16.14%.