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HSChapter 25
U.S. imports of ground natural calcium phosphates, aluminum calcium phosphates & phosphatic chalk (HS 251020) totaled $44K in April 2026, traded with 4 countries.
Ground Natural Calcium Phosphates, Aluminum Calcium Phosphates & Phosphatic Chalk imports of $44K in April 2026 ran 11% above the year-to-date monthly average of $40K.
Last updated: April 2026 dataGround natural calcium phosphates have been milled to a specified particle size, making them immediately usable as direct-application fertilizers or as a more reactive feedstock for phosphoric acid production — a processing distinction that separates them from unground phosphate rock under HTS 2510200000. The ground form commands premium logistics handling due to its dusty, hygroscopic nature, and bulk shipments typically require enclosed or covered conveyance. Importers sourcing ground phosphate should verify P₂O₅ content and moisture specifications, as these directly affect agronomic value and classification boundary with chemically processed phosphate products.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Natural phosphates that have been treated with acid (e.g., to produce superphosphate or triple superphosphate) or otherwise chemically transformed move out of heading 2510 and into Chapter 31 as fertilizers. HTS 2510 covers only mechanically processed (ground) material that retains its natural mineral composition.
Ground phosphate is fine-grained and prone to dusting and moisture absorption, requiring enclosed bulk vessels or covered hopper cars. Port facilities must have dust-control measures, and importers should confirm that moisture content on arrival does not exceed contractual limits, as excess moisture affects weight-based duty calculations and product quality.
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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 % | Duty Collected |
|---|---|---|---|---|
| 2510200000 | NATURAL CA/AL CA PHSPHTS & PHSPHTC CHALK, GROUND | $44K | 25.01% | $1K |
NATURAL CA/AL CA PHSPHTS & PHSPHTC CHALK, GROUND
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2510200000 | NATURAL CA/AL CA PHSPHTS & PHSPHTC CHALK, GROUND | $164K |
NATURAL CA/AL CA PHSPHTS & PHSPHTC CHALK, GROUND
98 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
UNGRND NAT CAL PHSPH, ALUM CAL PHOS A PHOS CHALK
HS 251010
FLUORSPAR OV 97% OF CALCIUM FLUORD BY WGHT
HS 252922
PEBBLES, GRAVEL ETC. FOR CONCRETE AGGREGATES ETC.
HS 251710
| Country | Imports | Exports | Balance |
|---|---|---|---|
| CANADA | $5K | $149K | +$144K |
| UNITED KINGDOM | $34K | -- | -$34K |
| CHILE | -- | $12K | +$12K |
| CHINA | $5K | -- | -$5K |
| NEW ZEALAND | -- | $3K | +$3K |
| State | Imports | Exports | Balance |
|---|---|---|---|
| Indiana | -- | $99K | +$99K |
| South Carolina | $34K | -- | -$34K |
| Montana | -- | $31K | +$31K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| PORT HURON, MI | -- | $70K | +$70K |
| SWEETGRASS, MT | $5K | $43K | +$38K |
| CHARLESTON, SC | $34K | -- | -$34K |