Other inorganic acids and other inorganic oxygen compounds — HTS 2811
Other inorganic acids and other inorganic oxygen compounds of nonmetals
Chapter 28 › Heading 2811
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 2811 is a broad product category for certain inorganic acids and other oxygen-containing compounds of nonmetals. It generally covers chemical substances made from nonmetal elements—such as sulfur, nitrogen, phosphorus, or halogens—when the product fits the heading’s descriptions and is not placed in a more specific heading elsewhere. The word “other” means this heading excludes products covered by earlier, more specific provisions.
To narrow from heading 2811 to an 8-digit subheading, identify the exact chemical and match it to the listed material or chemical type. The classification may depend on the substance’s chemical identity, such as whether it is an acid, an oxide, another oxygen compound, or a mixture or preparation. Use the product’s scientific name, formula, concentration, physical form, and intended composition—not just its trade name. Confirm the wording in the current HTSUS, including any statistical suffixes and unit-of-quantity requirements; a customs broker or classification ruling may be appropriate for borderline products.
What to check
- Obtain the supplier’s safety data sheet, certificate of analysis, chemical formula, purity, and concentration.
- Match the product’s exact chemical identity to the HTSUS subheading text and relevant legal notes.
- Check whether the item is a pure chemical, mixture, solution, preparation, or waste, because that may change classification.
- Review the headings before and after 2811 and the chapter notes to confirm that a more specific provision does not apply.
- Verify the full tariff number, statistical suffix, units of quantity, country-specific measures, and any current customs guidance before entry.
HTS heading 2811 summary
Other inorganic acids and other inorganic oxygen compounds 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 |
|---|---|
| 2811.19 | Other |
| 2811.22 | Silicon dioxide |
| 2811.29 | 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 |
|---|---|---|---|---|
| 2811.11.00.00 👉 | Hydrogen fluoride (Hydrofluoric acid) | Free | — | Free |
| 2811.12.00.00 👉 | Hydrogen cyanide (hydrocyanic acid) | 4.2% | Free | 25% |
| 2811.21.00.00 👉 | Carbon dioxide | 3.7% | 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 2811?
Other inorganic acids and other inorganic oxygen compounds of nonmetals. 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.