Sulfates — HTS 2833
Sulfates; alums; peroxosulfates (persulfates)
Chapter 28 › Heading 2833
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 2833 is a broad product category for sulfates, alums, and peroxosulfates (also called persulfates). These are chemical compounds whose classification depends on their chemical identity and, in some cases, whether they are a particular kind of salt, alum, or persulfate. The heading is not a single product code and does not by itself determine duty treatment.
To reach the correct 8-digit HTSUS code, start with the product’s exact chemical composition and identify the applicable 6-digit subheading. The remaining digits usually distinguish the specific material or chemical type, such as a named sulfate, alum, or persulfate, or an “other” provision. Confirm the code against the current HTSUS, including the legal notes and product descriptions, rather than choosing based only on a trade name or end use.
What to check
- Obtain the safety data sheet, technical data sheet, and certificate of analysis, then verify the chemical name, formula, concentration, and mixture status.
- Determine whether the product is a sulfate, alum, or peroxosulfate, and distinguish it from a similar-looking chemical with a different composition.
- Read the heading, subheading, and 8-digit statistical breakout together; check whether the product is specifically named or belongs under an “other” provision.
- Check whether the item is a pure compound, solution, preparation, or mixture, because composition and presentation can affect classification.
- Confirm the proposed code with current official HTSUS text and, when the facts are uncertain, seek a customs broker’s advice or a binding classification ruling.
HTS heading 2833 summary
Sulfates is a 4-digit product category containing 7 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 |
|---|---|
| 2833.11 | Disodium sulfate |
| 2833.29 | Other |
| 2833.40 | Peroxosulfates (persulfates) |
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 |
|---|---|---|---|---|
| 2833.19.00.00 👉 | Other | Free | — | Free |
| 2833.21.00.00 👉 | Of magnesium | 3.7% | Free | 20% |
| 2833.22.00.00 👉 | Of aluminum | Free | — | 10% |
| 2833.24.00.00 👉 | Of nickel | 3.2% | Free | 25% |
| 2833.25.00.00 👉 | Of copper | 1.4% | Free | 5% |
| 2833.27.00.00 👉 | Of barium | 0.6% | Free | 4.2% |
| 2833.30.00.00 👉 | Alums | 1.6% | 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 2833?
Sulfates; alums; peroxosulfates (persulfates). 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.