U.S. exports of polyamides (non-enumerated), primary forms (HS 390890) totaled $64.2M in August 2026.
Importers of Polyamides (Non-Enumerated), Primary Forms paid $2.3M in duties in August 2026, an effective tariff rate of 12.58% of the $18.5M imported — duty actually collected as a share of that value, not the published tariff schedule. Polyamides (Non-Enumerated), Primary Forms imports of $18.5M in August 2026 ran 10% above the year-to-date monthly average of $16.8M.
Last updated: August 2026 dataSpecialty polyamides outside the standard nylon series — including high-performance aromatic and semi-aromatic grades — are classified here, with the US schedule distinguishing bis(4-amino-3-methylcyclohexyl)methane-isophthalic acid copolymer (3908902000) from all other polyamides (3908907000). These materials serve demanding applications in aerospace, optical fiber coatings, and high-temperature electrical insulation where standard PA-6 or PA-6,6 grades are insufficient. Germany and Switzerland lead supply, reflecting the concentration of high-performance polymer R&D and production in those countries.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
480 shipments/mo
This line covers a specific transparent, amorphous polyamide copolymer (commercially known by trade names such as Grilamid TR or Trogamid) used in optical lenses, medical devices, and luxury packaging. Its dedicated tariff line reflects its chemical distinctiveness from conventional semi-crystalline polyamides and allows customs to track trade in this high-value specialty resin separately.
The key is whether the polyamide is one of the specifically enumerated types in 3908.10 — PA-6, -11, -12, -6,6, -6,9, -6,10, or -6,12. Aromatic polyamides (aramids), copolyamides with non-standard monomer combinations, and other non-enumerated grades belong in 3908.90. A licensed customs broker and the product's chemical specification sheet are essential for making this determination accurately.
HSChapter 39
ImportsExports
Imports
$18.5MYoY · free account
Exports
$64.2MYoY · free account
12-mo low · imports
YoY · free accountOver the twelve months to August 2026, the U.S. imported $178.8M of Polyamides (Non-Enumerated), Primary Forms.
Through August 2026. Source: U.S. Census Bureau.
Trade Directory
List your company under HS 390890 — Polyamides (Non-Enumerated), Primary Forms, so the companies trading it can find you. Be the first supplier listed.
Subheading 2 of 2 in heading 3908
Subheading 390890 · $64.2M of $198.9M
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 |
|---|---|---|---|---|---|
| 3908907000 | Other Polyamides in Primary Forms | $16.1M | 12.69% | 90.23% | $2.0M |
| 3908902000 | Bis(4-Amino-3-Methylcyclohexyl)Methane-Isophthalic | $2.4M | 11.84% | 100.74% | $283K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3908907000 | Other Polyamides in Primary Forms | $59.9M |
| 3908902000 | Bis(4-Amino-3-Methylcyclohexyl)Methane-Isophthalic | $4.3M |
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.
Exports · August 2026
destination
Mexico and United Kingdom together take 40% of it.
customs district
origin
entry
rate provision · imports
9.6% enters free of duty; duty collected equals 12.58% of total import value.