Dolomite — HTS 2518
Dolomite, whether or not calcined or sintered, including dolomite roughly trimmed or merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape
Chapter 25 › Heading 2518
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 2518 is a four-digit product category for dolomite. It generally covers dolomite in its natural state, as well as dolomite that has been calcined or sintered. It also includes dolomite that is roughly trimmed or merely cut by sawing or another method into rectangular or square blocks or slabs. The heading describes the material and its basic processing or form—not a single finished product code.
To select the specific eight-digit U.S. HTS code, first confirm that the product is dolomite and then narrow it by the facts used in the applicable subheading and statistical provision. These may distinguish the material’s condition or type, such as unprocessed, calcined, sintered, or cut into blocks or slabs. Review the complete eight-digit wording in the current HTSUS, because the final digits provide the U.S.-specific classification detail. If the product has been further manufactured, blended, or made into a finished article, another heading may apply.
What to check
- Confirm the product is actually dolomite, using the supplier’s technical description, mineral analysis, and product specifications.
- Identify whether it is unprocessed, roughly trimmed, merely cut into blocks or slabs, calcined, or sintered; document the process used.
- Record the physical form, including whether pieces are rectangular or square blocks or slabs and whether they received processing beyond basic cutting.
- Read every subheading and the full eight-digit statistical provision in the current HTSUS rather than stopping at heading 2518.
- Ask a customs broker or request a binding classification ruling when the material, processing, or finished form could fit more than one provision.
HTS heading 2518 summary
Dolomite is a 4-digit product category containing 2 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.
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 |
|---|---|---|---|---|
| 2518.10.00.00 👉 | Dolomite, not calcined or sintered | Free | — | Free |
| 2518.20.00.00 👉 | Calcined or sintered dolomite | 3% | Free | 30% |
"Special" shows the free-trade-agreement rate; open a code to see exactly which countries qualify.
Common questions
What products fall under HTS heading 2518?
Dolomite, whether or not calcined or sintered, including dolomite roughly trimmed or merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape. 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.