Amine-function compounds — HTS 2921
Amine-function compounds
Chapter 29 › Heading 2921
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 2921 is a broad 4-digit category for organic chemicals with an amine function. In plain language, it groups compounds whose molecular structure contains an amine-type nitrogen, including various acyclic, cyclic, aromatic, and related amine compounds. It is a classification category, not one single product description or duty rate.
To reach the correct 8-digit HTSUS code, follow the subheading structure and the product’s chemistry. The relevant distinctions may include the compound’s molecular structure, whether it is acyclic or cyclic, the type and number of amine groups, whether it is a defined compound or a mixture, and whether it is presented as a salt or another preparation. The exact wording of the applicable subheadings, section and chapter notes, and the product’s technical documentation control; intended use alone usually does not determine classification.
What to check
- Identify the exact chemical substance, not just its trade name, and obtain its chemical name, formula, CAS Registry Number, and purity from the SDS or supplier specification.
- Determine the compound’s structural type, including whether it is acyclic, cyclic, aromatic, or a salt, and note the number and kind of amine functions.
- Read the HTSUS heading and subheading text together with the legal notes for Chapter 29; do not select a code based only on a search-keyword match.
- Check whether the item is a single chemically defined compound, a mixture, or a preparation, because that distinction can move it outside the expected subheading.
- Confirm the proposed 8-digit code against current official HTSUS materials and, when the chemistry or presentation is unclear, obtain a customs broker’s or classification specialist’s review.
HTS heading 2921 summary
Amine-function compounds is a 4-digit product category containing 6 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 |
|---|---|
| 2921.19 | Other |
| 2921.22 | Hexamethylenediamine and its salts |
| 2921.30 | Cyclanic, cyclenic or cycloterpenic mono- or polyamines, and their derivatives; salts thereof |
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 |
|---|---|---|---|---|
| 2921.11.00.00 👉 | Methylamine, di- or trimethylamine and their salts | 3.7% | Free | 25% |
| 2921.12.01.00 👉 | 2-(N,N-Dimethylamino)ethyl chloride hydrochloride | Free | — | 30.5% |
| 2921.13.00.00 👉 | 2-(N,N-Diethylamino)ethyl chloride hydrochloride | Free | — | 30.5% |
| 2921.14.00.00 👉 | 2-(N,N,-Diisopropylamino)ethyl chloride hydrochloride | 6.5% | Free | 30.5% |
| 2921.21.00.00 👉 | Ethylenediamine and its salts | 5.8% | Free | 39% |
| 2921.29.00 👉 | Other | 6.5% | Free | 30.5% |
"Special" shows the free-trade-agreement rate; open a code to see exactly which countries qualify.
Common questions
What products fall under HTS heading 2921?
Amine-function compounds. 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.