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HSChapter 25
U.S. imports of unground natural calcium phosphates, aluminum calcium phosphates & phosphatic chalk (HS 251010) totaled $20.7M in April 2026, traded with 2 countries.
Unground Natural Calcium Phosphates, Aluminum Calcium Phosphates & Phosphatic Chalk imports of $20.7M in April 2026 ran 16% below the year-to-date monthly average of $24.8M.
Last updated: April 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.
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.
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Monthly import values over time
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % |
|---|---|---|---|
| 2510100000 | NATURAL CA/AL CA PHSPHTS & PHSPHTC CHALK, UNGROUND | $20.7M | -- |
NATURAL CA/AL CA PHSPHTS & PHSPHTC CHALK, UNGROUND
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2510100000 | NATURAL CA/AL CA PHSPHTS & PHSPHTC CHALK, UNGROUND | $18K |
NATURAL CA/AL CA PHSPHTS & PHSPHTC CHALK, UNGROUND
46 t
PORTLAND CEMENT EXCEPT WHITE PORTLAND CEMENT
HS 252329
SULFUR OF ALL KINDS, NOT SUBLIMED,PRECIP,COLLOIDAL
HS 250300
SALT INCL TBL/DENTRD, PURE SODM CHLOR ETC; SEA WTR
HS 250100
FLUORSPAR OV 97% OF CALCIUM FLUORD BY WGHT
HS 252922
PEBBLES, GRAVEL ETC. FOR CONCRETE AGGREGATES ETC.
HS 251710
WHITE PORTLAND CEMENT WHTHR OR NT ART COLORED
HS 252321
| Port | Imports | Exports | Balance |
|---|---|---|---|
| GRAMERCY, LA | $12.7M | -- | -$12.7M |
| PORT MANATEE, FL | $7.9M | -- | -$7.9M |
| DETROIT, MI | $29K | -- | -$29K |