Carbonates — HTS 2836
Carbonates; peroxocarbonates (percarbonates); commercial ammonium carbonate containing ammonium carbamate
Chapter 28 › Heading 2836
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 2836 is a four-digit product category for certain carbonate compounds. It groups carbonates, peroxocarbonates (also called percarbonates), and commercial ammonium carbonate that contains ammonium carbamate. A heading is a broad classification level, not usually the final code used for entry filing.
To reach the correct 8-digit HTSUS code, first identify the product’s chemical identity and form, then follow the more detailed subheadings and statistical suffixes under heading 2836. The available subdivisions commonly distinguish the material or chemical type, such as a particular metal carbonate, ammonium carbonate, or a percarbonate. Confirm the product’s composition, purity, and any stated use or formulation details against the wording of the relevant subheading. A customs broker or classification specialist may be needed where the chemistry or product description is unclear.
What to check
- Check the product’s exact chemical name, CAS information, formula, and composition from the safety data sheet and supplier specifications.
- Determine whether the product is a carbonate, a peroxocarbonate (percarbonate), or commercial ammonium carbonate containing ammonium carbamate.
- Read every subheading under 2836 and compare the product with any named material, residual category, or chemical-description requirement.
- Verify whether the product is a pure compound, mixture, solution, preparation, or packaged formulation; classification may change outside the expected category.
- Confirm the current 8-digit HTSUS code and any associated notes or reporting requirements in official tariff data, and seek broker advice for borderline cases.
HTS heading 2836 summary
Carbonates 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 |
|---|---|
| 2836.40 | Potassium carbonates |
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 |
|---|---|---|---|---|
| 2836.20.00.00 👉 | Disodium carbonate | 1.2% | Free | 8.5% |
| 2836.30.00.00 👉 | Sodium hydrogencarbonate (Sodium bicarbonate) | Free | — | Free |
| 2836.50.00.00 👉 | Calcium carbonate | Free | — | 25% |
| 2836.60.00.00 👉 | Barium carbonate | 2.3% | Free | 8.4% |
"Special" shows the free-trade-agreement rate; open a code to see exactly which countries qualify.
Common questions
What products fall under HTS heading 2836?
Carbonates; peroxocarbonates (percarbonates); commercial ammonium carbonate containing ammonium carbamate. 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.