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HSChapter 39
U.S. exports of polyacetals, primary forms (HS 390710) totaled $33.6M in July 2026.
Importers of Polyacetals, Primary Forms paid $274K in duties in July 2026 — an effective duty rate of 8.3% on $3.3M in dutiable value, based on actual customs collections rather than the published tariff schedule. Polyacetals, Primary Forms imports of $5.6M in July 2026 ran 10% below the year-to-date monthly average of $6.2M.
Last updated: July 2026 dataPolyacetals—commonly marketed as POM (polyoxymethylene) or under trade names such as Delrin and Celcon—are engineering thermoplastics prized for their high stiffness, low friction, and dimensional stability in precision mechanical parts. South Korea and Germany are the leading US import sources, with Malaysia and Japan also supplying meaningful volumes. Classified under a single 10-digit line (3907100000), the heading is straightforward to classify but importers should be alert to Section 301 exposure when product is routed through or originates from affected jurisdictions. End-use sectors include automotive components, consumer electronics, and industrial gears and fasteners.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
276 shipments/mo
Polyacetals (heading 3907.10) are specifically defined by their repeating oxymethylene (-CH₂-O-) backbone, distinguishing them from broader polyether categories. Other polyethers not meeting this structural definition fall under 3907.29. Suppliers' chemical data sheets and CAS numbers help confirm the correct heading at entry.
Automotive OEM and Tier 1 suppliers are the largest consumers, using polyacetals for fuel system components, door handles, and seat belt parts. Consumer electronics and industrial machinery manufacturers also rely on POM for gears, bearings, and housings where metal replacement is sought. Demand tends to track automotive production cycles closely.
Subheading 9 of 11 in heading 3907
Subheading 390710 · $5.6M of $421.1M
ImportsExports
Imports
$5.6MYoY · Pro
Exports
$33.6MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Exports · July 2026
destination
Mexico and China together take 43% of it.
customs district
origin
entry
rate provision · imports
40.1% enters free of duty; the effective duty rate is 4.92%.
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 |
|---|---|---|---|---|---|
| 3907100000 | Polyacetals | $5.6M | 4.92% | 59.49% | $274K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3907100000 | Polyacetals | $33.6M |
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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