Polycarboxylic acids — HTS 2917
Polycarboxylic acids, their anhydrides, halides, peroxides and peroxyacids; their halogenated, sulfonated, nitrated or nitrosated derivatives
Chapter 29 › Heading 2917
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 2917 is a broad product category for certain polycarboxylic acids and closely related chemical forms. It can include the acids themselves, plus their anhydrides, halides, peroxides, peroxyacids, and derivatives that have been halogenated, sulfonated, nitrated, or nitrosated. In plain language, these are organic chemicals with multiple carboxylic-acid groups or chemically related versions of those substances.
The 4-digit heading is only the starting point, not the final tariff classification. To reach the correct 8-digit HTSUS subheading, identify the exact chemical substance and form, then follow the progressively narrower descriptions under heading 2917. The subdivisions commonly distinguish products by named material, chemical type, or whether the product is an acid, anhydride, derivative, or another covered form. The product’s composition and intended identity—not just its commercial name—control the analysis.
What to check
- Obtain the product’s chemical name, CAS Registry Number, molecular formula, and safety data sheet; do not rely only on a brand or trade name.
- Confirm whether the shipment is the pure substance, a mixture, solution, preparation, derivative, or a different chemical form such as an anhydride or halide.
- Read every 8-digit option under heading 2917 and match the product to the most specific description before considering residual or “other” provisions.
- Check the HTSUS section and chapter notes, including rules that may direct certain mixtures, preparations, or specially described chemicals elsewhere.
- When the composition or chemical form is uncertain, ask a customs broker or request a formal classification ruling before entry.
HTS heading 2917 summary
Polycarboxylic acids 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 |
|---|---|
| 2917.12 | Adipic acid, its salts and esters |
| 2917.14 | Maleic anhydride |
| 2917.19 | Other |
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 |
|---|---|---|---|---|
| 2917.11.00.00 👉 | Oxalic acid, its salts and esters | 3.1% | Free | 34.5% |
| 2917.13.00 👉 | Azelaic acid, sebacic acid, their salts and esters | 4.8% | Free | 25% |
| 2917.20.00.00 👉 | Cyclanic, cyclenic or cycloterpenic polycarboxylic acids, their anhydrides, halides, peroxides, peroxyacids and their derivatives | 4.2% | Free | 25% |
"Special" shows the free-trade-agreement rate; open a code to see exactly which countries qualify.
Common questions
What products fall under HTS heading 2917?
Polycarboxylic acids, their anhydrides, halides, peroxides and peroxyacids; their halogenated, sulfonated, nitrated or nitrosated derivatives. 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.