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HSChapter 39
U.S. exports of saturated polyesters (non-enumerated), primary forms (HS 390799) totaled $116.8M in July 2026.
Importers of Saturated Polyesters (Non-Enumerated), Primary Forms paid $5.5M in duties in July 2026 — an effective duty rate of 15% on $36.1M in dutiable value, based on actual customs collections rather than the published tariff schedule. Saturated Polyesters (Non-Enumerated), Primary Forms imports of $49.2M in July 2026 ran 12% above the year-to-date monthly average of $44.0M.
Last updated: July 2026 dataSaturated polyesters in primary forms encompass a commercially diverse group including polybutylene terephthalate (PBT), thermoplastic liquid crystal aromatic polyester copolymers, and other engineering-grade resins used in electronics, automotive connectors, and packaging. The four 10-digit lines under this heading — 3907990100, 3907992000, 3907995010, and 3907995050 — reflect meaningful performance distinctions: liquid crystal polymers (LCPs) command premium pricing for high-frequency circuit board applications, while PBT (3907995010) is a workhorse for injection-molded parts. Germany and Taiwan are the leading suppliers, reflecting the concentration of specialty polymer production in those markets.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
2.1K shipments/mo
Liquid crystal polymers (LCPs) are classified separately at 3907992000 because of their unique self-reinforcing molecular structure, which delivers exceptional dimensional stability and low dielectric loss. Standard saturated polyesters and PBT that lack this aromatic LCP architecture fall under 3907995010 or 3907995050.
Germany is the leading supplier under this heading. Imports from Germany do not benefit from a US free trade agreement, so the general MFN duty rate applies. Importers should also check whether any Section 301 or other trade-remedy orders are in effect for the specific product at the time of entry.
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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 |
|---|---|---|---|---|---|
| 3907995050 | Polyesters,NESOI | $41.0M | 10.70% | 70.09% | $4.4M |
| 3907995010 | Polybutylene Terephthlate, NESOI | $7.3M | 13.74% | 89.33% | $1.0M |
| 3907992000 | Thermoplastic Liq Crystal Arom Polyester Copolymer | $851K | 12.24% | 93.27% | $104K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3907990100 | Polyesters, Saturated, In Primary Forms, NESOI | $116.8M |
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
$49.2MYoY · Pro
Exports
$116.8MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Exports · July 2026
destination
Mexico and China together take 54% of it.
customs district
origin
entry
rate provision · imports
26.1% enters free of duty; the effective duty rate is 11.18%.