U.S. exports of Saturated Polyesters (Non-Enumerated), Primary Forms (HS 390799) totaled $94.4M in August 2026.
Importers of Saturated Polyesters (Non-Enumerated), Primary Forms paid $6.0M in duties in August 2026, an average duty rate of 11.78% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Saturated Polyesters (Non-Enumerated), Primary Forms imports of $50.7M in August 2026 ran 13% above the year-to-date monthly average of $44.8M.
Last updated: August 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 import shipments a month
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.
Subheading 2 of 11 in heading 3907
Subheading 390799 · $94.4M of $440.8M
ImportsExports
Imports
$50.7MYoY · free account
Exports
$94.4MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $520.3M of Saturated Polyesters (Non-Enumerated), Primary Forms and exported $1.2B.
Through August 2026. Source: U.S. Census Bureau.
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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 |
|---|---|---|---|---|---|
| 3907995050 | Polyesters, NESOI | $39.2M | 11.87% | 77.06% | $4.7M |
| 3907995010 | Polybutylene Terephthlate, NESOI | $10.3M | 11.57% | 98.24% | $1.2M |
| 3907992000 | Thermoplastic Liq Crystal Arom Polyester Copolymer | $1.1M | 10.60% | 87.51% | $115K |
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 | $94.4M |
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 · August 2026
destination
Mexico and China together take 55% of it.
customs district
origin
entry
rate provision · imports
18.3% enters free of duty; duty collected equals 11.78% of imports for consumption.