Loading...
HSChapter 39
U.S. exports of unsaturated polyesters (non-enumerated), primary forms (HS 390791) totaled $24.7M in July 2026.
Importers of Unsaturated Polyesters (Non-Enumerated), Primary Forms paid $934K in duties in July 2026 — an effective duty rate of 13% on $7.1M in dutiable value, based on actual customs collections rather than the published tariff schedule. Unsaturated Polyesters (Non-Enumerated), Primary Forms imports of $16.1M in July 2026 ran 12% above the year-to-date monthly average of $14.3M.
Last updated: July 2026 dataUnsaturated polyesters in primary forms — including allyl resins and general-purpose unsaturated grades — are foundational thermoset intermediates for fiberglass-reinforced composites, marine hulls, and construction panels. The US tariff schedule breaks this heading into four 10-digit lines: uncompounded allyl resins (3907912000), other allyl resins (3907914000), other unsaturated polyesters (3907915000), and a residual basket (3907910000). Canada leads supply, with South Korea and Mexico also among the top sources. Importers should verify whether specific formulations trigger Section 301 exposure depending on origin.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
437 shipments/mo
Under this heading, allyl resins are split into uncompounded (3907912000) and other (3907914000) lines, while non-allyl unsaturated polyesters fall under 3907915000 or the residual line 3907910000. The key classification factor is whether the resin is allyl-based and whether it has been compounded with other substances.
South Korea is a leading supplier under this heading. Importers should confirm at the time of entry whether any antidumping, countervailing duty, or Section 301 orders apply to the specific product and origin, as trade-remedy coverage can change and varies by formulation and tariff line.
Supplier Network
Get discovered by U.S. importers searching for HS 390791 — Unsaturated Polyesters (Non-Enumerated), Primary Forms. Be the first supplier listed.
Subheading 7 of 11 in heading 3907
Subheading 390791 · $16.1M of $421.1M
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 |
|---|---|---|---|---|---|
| 3907915000 | Unsaturated Polyesters, NESOI | $12.8M | 4.83% | 34.11% | $618K |
| 3907912000 | Unsaturated Allyl Resins, Uncompounded | $2.5M | 10.28% | 93.95% | $260K |
| 3907914000 | Unsaturated Allyl Resins, NESOI | $750K | 7.61% | 48.16% | $57K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3907910000 | Other Polyesters, Unsaturated | $24.7M |
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.
ImportsExports
Imports
$16.1MYoY · Pro
Exports
$24.7MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Exports · July 2026
destination
Canada and Mexico together take 94% of it.
customs district
origin
entry
rate provision · imports
55.3% enters free of duty; the effective duty rate is 5.82%.