Natural magnesium carbonate — HTS 2519
Natural magnesium carbonate (magnesite); fused magnesia; dead-burned (sintered) magnesia, whether or not containing small quantities of other oxides added before sintering; other magnesium oxide, whether or not pure
Chapter 25 › Heading 2519
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 2519 is a four-digit product category for several forms of magnesium-based mineral products. It covers natural magnesium carbonate (magnesite), fused magnesia, dead-burned or sintered magnesia, and other magnesium oxide, including some products that contain small amounts of other oxides added before sintering.
The eight-digit subheading identifies the product more precisely, usually by its material and processing method. To narrow the classification, determine whether the goods are natural magnesium carbonate, fused magnesia, sintered or dead-burned magnesia, or another form of magnesium oxide, then review the applicable HTS subheadings and their product descriptions. Physical form, purity, additives, and processing history may also matter. If the product is a preparation, mixture, or specialized formulated material, classification may require customs-broker or other professional review.
What to check
- Check the product’s chemical identity: magnesium carbonate, fused magnesia, sintered or dead-burned magnesia, or another magnesium oxide.
- Confirm how the material was made, including whether it was fused, sintered, or dead-burned and whether other oxides were added before sintering.
- Compare the product’s specification sheet, certificate of analysis, and manufacturing records with the exact HTS subheading wording.
- Do not classify solely by a trade name such as “magnesia”; verify composition, purity, additives, and physical form.
- Ask a customs broker or seek a formal classification decision when the product is a mixture, modified material, or does not clearly match one subheading.
HTS heading 2519 summary
Natural magnesium carbonate is a 4-digit product category containing 1 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 |
|---|---|
| 2519.90 | 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 |
|---|---|---|---|---|
| 2519.10.00.00 👉 | Natural magnesium carbonate (magnesite) | Free | — | $10.33/t |
"Special" shows the free-trade-agreement rate; open a code to see exactly which countries qualify.
Common questions
What products fall under HTS heading 2519?
Natural magnesium carbonate (magnesite); fused magnesia; dead-burned (sintered) magnesia, whether or not containing small quantities of other oxides added before sintering; other magnesium oxide, whether or not pure. 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.