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HSChapter 39
U.S. imports of unsaturated polyesters (non-enumerated), primary forms (HS 390791) totaled $15.5M in April 2026, traded with 31 countries.
Importers of Unsaturated Polyesters (Non-Enumerated), Primary Forms paid $766K in duties in April 2026 — an effective duty rate of 13% on $5.7M in dutiable value, based on actual customs collections rather than the published tariff schedule. Unsaturated Polyesters (Non-Enumerated), Primary Forms imports of $15.5M in April 2026 ran 28% above the year-to-date monthly average of $12.1M.
Last updated: April 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.
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.
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| Country | Imports | Exports | Balance |
|---|---|---|---|
| CANADA | $7.5M | $13.0M | +$5.5M |
| MEXICO | $2.2M | $10.0M | +$7.8M |
| KOREA, SOUTH | $1.7M | $9K | -$1.7M |
| TURKEY | $1.3M | $6K | -$1.3M |
| SAUDI ARABIA | -- | $809K | +$809K |
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 |
|---|---|---|---|---|
| 3907915000 | UNSATURATED POLYESTERS, NESOI | $12.4M | 15.55% | $554K |
| 3907912000 | UNSATURATED ALLYL RESINS, UNCOMPOUNDED | $2.5M | 9.20% | $175K |
| 3907914000 | UNSATURATED ALLYL RESINS, NESOI | $602K | 15.89% | $37K |
UNSATURATED POLYESTERS, NESOI
UNSATURATED ALLYL RESINS, UNCOMPOUNDED
UNSATURATED ALLYL RESINS, NESOI
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3907910000 | OTHER POLYESTERS, UNSATURATED | $25.7M |
OTHER POLYESTERS, UNSATURATED
7.1M 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 |
|---|---|---|---|
| Michigan | $214K | $4.5M | +$4.2M |
| California | $930K | $3.6M | +$2.7M |
| Illinois | $602K | $3.9M | +$3.3M |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| PORT HURON, MI | $4.1M | $3.5M | -$545K |
| OTAY MESA, CA | -- | $5.6M | +$5.6M |
| BUFFALO-NIAGARA FALLS, NY | $3.0M | $2.3M | -$761K |