U.S. exports of Unsaturated Polyesters (Non-Enumerated), Primary Forms (HS 390791) totaled $26.3M in August 2026.
Importers of Unsaturated Polyesters (Non-Enumerated), Primary Forms paid $986K in duties in August 2026, an average duty rate of 6.12% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Unsaturated Polyesters (Non-Enumerated), Primary Forms imports of $16.1M in August 2026 ran 11% above the year-to-date monthly average of $14.6M.
Last updated: August 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.
425 import shipments a month
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.
Subheading 6 of 11 in heading 3907
Subheading 390791 · $26.3M of $440.8M
ImportsExports
Imports
$16.1MYoY · free account
Exports
$26.3MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $160.9M of Unsaturated Polyesters (Non-Enumerated), Primary Forms and exported $283.7M.
Through August 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 | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 3907915000 | Unsaturated Polyesters, NESOI | $12.6M | 4.96% | 34.24% | $624K |
| 3907912000 | Unsaturated Allyl Resins, Uncompounded | $3.2M | 10.94% | 94.00% | $354K |
| 3907914000 | Unsaturated Allyl Resins, NESOI | $310K | 2.45% | 19.04% | $8K |
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 | $26.3M |
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.
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Exports · August 2026
destination
Canada and Mexico together take 90% of it.
customs district
origin
entry
rate provision · imports
54.0% enters free of duty; duty collected equals 6.12% of imports for consumption.