U.S. imports of Unground Natural Calcium Phosphates, Aluminum Calcium Phosphates & Phosphatic Chalk (HS 251010) totaled $32.6M in August 2026, imported from 2 countries.
Unground Natural Calcium Phosphates, Aluminum Calcium Phosphates & Phosphatic Chalk imports of $32.6M in August 2026 ran 29% above the year-to-date monthly average of $25.3M.
Last updated: August 2026 dataUnground natural calcium phosphates — including phosphate rock and aluminum calcium phosphates — are the primary upstream feedstock for the global fertilizer and phosphoric acid industries, classified at the US level under 2510100000. Because the material has not been ground, it typically represents run-of-mine or lump-form ore destined for further processing at domestic facilities. The unground designation is commercially significant: it signals a lower degree of beneficiation compared to ground phosphate and generally commands different pricing and freight economics.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
16 import shipments a month
The HTS separates unground (2510100000) from ground (2510200000) natural phosphates because grinding represents a meaningful processing step that changes the product's commercial form, freight density, and end-use readiness. Misclassifying ground material as unground — or vice versa — can result in duty discrepancies and CBP examination.
Unground phosphate rock is processed domestically into phosphoric acid, which in turn is used to manufacture diammonium phosphate (DAP), monoammonium phosphate (MAP), and other fertilizers. It also feeds into animal feed phosphates and industrial phosphate chemicals.
Subheading 1 of 2 in heading 2510
Subheading 251010 · $32.6M of $32.8M
ImportsExports
Imports
$32.6MYoY · free account
Exports
$10KYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $301.9M of Unground Natural Calcium Phosphates, Aluminum Calcium Phosphates & Phosphatic Chalk.
Through August 2026 · exports 9 of 12 months reported. Source: U.S. Census Bureau.
Imports · August 2026
origin
Peru and Canada together supply 100% of it.
customs district
destination
entry
rate provision · imports
100.0% enters free of duty; duty collected equals 0.00% of imports for consumption.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share |
|---|---|---|---|---|
| 2510100000 | Natural Ca/Al Ca Phsphts & Phsphtc Chalk, Unground | $32.6M | 0.00% | 0.00% |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2510100000 | Natural Ca/Al Ca Phsphts & Phsphtc Chalk, Unground | $10K |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
Trade Directory
List your company under HS 251010 — Unground Natural Calcium Phosphates, Aluminum Calcium Phosphates & Phosphatic Chalk, so the companies trading it can find you. Be the first supplier listed.