Carboxylic acids with additional oxygen function and their — HTS 2918
Carboxylic acids with additional oxygen function and their anhydrides, halides, peroxides and peroxyacids; their halogenated, sulfonated, nitrated or nitrosated derivatives
Chapter 29 › Heading 2918
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 2918 is a broad product category for certain carboxylic acids that also contain an additional oxygen function, along with related chemical forms. It can include their anhydrides, halides, peroxides, peroxyacids, and derivatives that have been halogenated, sulfonated, nitrated, or nitrosated. In plain language, these are organic chemicals with a carboxylic-acid group plus another oxygen-related feature, grouped with specified modified forms.
The 4-digit heading is only the starting point. To reach the correct 8-digit HTSUS subheading, identify the exact chemical substance and form, then follow the lower-level descriptions—often distinguishing the material, chemical type, derivative, purity or mixture status, and sometimes how the product is presented. The product’s name alone may not be enough; the chemical identity and composition control classification.
What to check
- Obtain the safety data sheet, technical data sheet, and formulation or composition details before classifying the product.
- Confirm the exact chemical identity, such as the systematic name, common name, CAS Registry Number, and whether it is an acid, anhydride, halide, peroxide, peroxyacid, or other derivative.
- Read every indentation and subheading under heading 2918, comparing the product’s composition and form with the full legal wording rather than stopping at the 4-digit heading.
- Check whether the shipment is a pure chemical, solution, preparation, mixture, or formulated product; packaging and concentration can affect classification elsewhere in the tariff.
- If multiple subheadings appear plausible, ask a licensed customs broker or seek a formal classification ruling from U.S. Customs and Border Protection.
HTS heading 2918 summary
Carboxylic acids with additional oxygen function and their is a 4-digit product category containing 4 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 |
|---|---|
| 2918.11 | Lactic acid, its salts and esters |
| 2918.13 | Salts and esters of tartaric acid |
| 2918.15 | Salts and esters of citric acid |
| 2918.16 | Gluconic acid, its salts and esters |
| 2918.19 | Other |
| 2918.21 | Salicylic acid and its salts |
| 2918.22 | O-Acetylsalicylic acid, its salts and esters |
| 2918.23 | Other esters of salicylic acid and their salts |
| 2918.29 | Other |
| 2918.30 | Carboxylic acids with aldehyde or ketone function but without other oxygen function, their anhydrides, halides, peroxides, peroxyacids and their derivatives |
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 |
|---|---|---|---|---|
| 2918.12.00.00 👉 | Tartaric acid | Free | — | 17% |
| 2918.14.00.00 👉 | Citric acid | 6% | Free | 39.5% |
| 2918.17.00.01 👉 | 2,2-Diphenyl-2-hydroxyacetic acid (benzilic acid) | 5.8% | Free | 15.4¢/kg + 40% |
| 2918.18.00.00 👉 | Chlorobenzilate (ISO) | 6.5% | Free | 15.4¢/kg + 57% |
"Special" shows the free-trade-agreement rate; open a code to see exactly which countries qualify.
Common questions
What products fall under HTS heading 2918?
Carboxylic acids with additional oxygen function and 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.