Amino-resins — HTS 3909
Amino-resins, phenolic resins and polyurethanes, in primary forms
Chapter 39 › Heading 3909
2026 HTS Rev 19 Synced Rules verified Operational
Written to help non-specialists understand this page. Rates, dates, and legal facts come from the official records above and on the linked source.
HTS heading 3909 is a broad product category for certain plastics in “primary forms”—the basic forms in which the material is made or supplied before it is turned into a finished article. It groups amino-resins, phenolic resins, and polyurethanes. These materials may be supplied as liquids, pastes, powders, granules, flakes, or other bulk forms, depending on the product and its formulation.
The 4-digit heading is only the starting point. To reach the correct 8-digit HTSUS code, first identify the resin family, then follow the more detailed subheadings and statistical breakouts, which commonly distinguish the material or type. Review the product’s technical description, chemical composition, physical form, and intended use. Do not classify a finished item merely because it contains one of these resins; finished articles may belong elsewhere in the tariff.
What to check
- Confirm that the imported product is a resin in primary form, rather than a finished article, coating, adhesive, component, or other prepared product.
- Identify the resin family: amino-resin, phenolic resin, or polyurethane, using the supplier’s technical data sheet and safety data sheet.
- Check the product’s chemical description, formulation, physical form, and any distinctions in the relevant 8-digit subheadings.
- Compare the product with the HTSUS legal text and the applicable chapter and section notes; do not rely on a commercial product name alone.
- Keep supporting documents, and ask a customs broker or request an official classification ruling when the formulation or subheading choice is uncertain.
HTS heading 3909 summary
Amino-resins is a 4-digit product category containing 3 published product-code lines in this snapshot. A heading does not carry one universal duty rate; classification must be narrowed to the line matching the product facts.
How to find your code in this category
A heading is a product category. To get the exact duty, narrow from this 4-digit heading to a sub-category (usually by material), then open the 8-digit code that matches your product.
Open any code in the tables below to see its exact duty rate, a duty calculator (enter your shipment value → estimated duty and landed cost), the rate-change history chart, and the country-by-country breakdown (including Section 301/232 add-on duties).
Why you have to click in: a single category can contain products with very different duties. The rate depends on the specific product — its material and construction — and on the country of origin, and those only get pinned down at the 8-digit code level. That is why this page points you to codes instead of showing one rate for the whole category.
Sub-categories
| Code | Description |
|---|---|
| 3909.50 | Polyurethanes |
Product codes & duty rates
👇 Each row is a specific product code — click a blue code to open its full page with exact duty rates by country, the rate-history chart, and a duty calculator. 👉
| Code | Description | General (MFN) | Special | Column 2 |
|---|---|---|---|---|
| 3909.10.00.00 👉 | Urea resins; thiourea resins | 6.5% | Free | 41.5% |
| 3909.20.00.00 👉 | Melamine resins | 6.5% | Free | 41.5% |
| 3909.40.00.00 👉 | Phenolic resins | 6.5% | Free | 15.4¢/kg + 48% |
"Special" shows the free-trade-agreement rate; open a code to see exactly which countries qualify.
Common questions
What products fall under HTS heading 3909?
Amino-resins, phenolic resins and polyurethanes, in primary forms. To classify a specific item you must pick the matching sub-category and 8-digit code above; the right choice usually depends on the material and construction of the product.
How do I choose the right code within this category?
Start from the sub-categories (typically divided by material—for example cotton versus man-made fibers), then open the active 8- or 10-digit code that matches the product. When unsure, a licensed customs broker or a CBP binding ruling can confirm the classification.
Reference information only, not customs, legal, or classification advice. Confirm the current code and rate against the official HTS before you import.