Natural calcium phosphates — HTS 2510
Natural calcium phosphates, natural aluminum calcium phosphates and phosphatic chalk
Chapter 25 › Heading 2510
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 2510 is a four-digit product category for certain naturally occurring phosphate mineral materials. It groups natural calcium phosphates, natural aluminum calcium phosphates, and phosphatic chalk. These are mineral substances in their natural or minimally processed form, rather than every product that happens to contain phosphate.
To reach the correct eight-digit HTSUS code, first confirm that the goods belong in heading 2510, then identify the applicable six-digit subheading and eight-digit statistical classification. The split is generally based on the material or mineral type and its condition or form, as described by the tariff text and any applicable notes. Review the complete product description, composition, processing history, and commercial documentation; when the facts are unclear, a customs broker or binding ruling process may be appropriate.
What to check
- Confirm that the product is a natural phosphate mineral covered by heading 2510, not a chemically manufactured phosphate, fertilizer preparation, or another mineral product.
- Identify the material type precisely: natural calcium phosphate, natural aluminum calcium phosphate, or phosphatic chalk, and check whether the tariff distinguishes its form or condition.
- Compare the product’s composition and processing history with the legal wording of the relevant six-digit and eight-digit provisions; do not rely only on a supplier’s product name.
- Keep technical data sheets, laboratory or mineral analyses, invoices, and processing details that support the selected classification.
- Check the current HTSUS text, statistical suffix, unit of quantity, and any Chapter 25 notes before filing; obtain broker or customs advice if classification remains uncertain.
HTS heading 2510 summary
Natural calcium phosphates 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 |
|---|---|---|---|---|
| 2510.10.00.00 👉 | Unground | Free | — | Free |
| 2510.20.00.00 👉 | Ground | Free | — | Free |
"Special" shows the free-trade-agreement rate; open a code to see exactly which countries qualify.
Common questions
What products fall under HTS heading 2510?
Natural calcium phosphates, natural aluminum calcium phosphates and phosphatic chalk. 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.