Harmonized System
U.S. imports of ground natural calcium phosphates, aluminum calcium phosphates & phosphatic chalk (HS 251020) totaled $193K in August 2026, imported from 7 countries.
Importers of Ground Natural Calcium Phosphates, Aluminum Calcium Phosphates & Phosphatic Chalk paid $10K in duties in August 2026, an effective tariff rate of 5.23% of the $193K imported — duty actually collected as a share of that value, not the published tariff schedule. Ground Natural Calcium Phosphates, Aluminum Calcium Phosphates & Phosphatic Chalk imports of $193K in August 2026 ran 130% above the year-to-date monthly average of $84K.
Last updated: August 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.
8 shipments/mo
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.
HSChapter 25
Trade Directory
List your company under HS 251020 — Ground Natural Calcium Phosphates, Aluminum Calcium Phosphates & Phosphatic Chalk, so the companies trading it can find you. Be the first supplier listed.
Subheading 2 of 2 in heading 2510
Subheading 251020 · $193K of $32.8M
ImportsExports
Imports
$193KYoY · free account
Exports
$143KYoY · free account
12-mo low · imports
YoY · free accountFewer than 6 of the last 12 months reported trade above $500K; the trend chart is not shown for thin series.
Through August 2026. Source: U.S. Census Bureau.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 2510200000 | Natural Ca/Al Ca Phsphts & Phsphtc Chalk, Ground | $193K | 5.23% | 52.32% | $10K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2510200000 | Natural Ca/Al Ca Phsphts & Phsphtc Chalk, Ground | $143K |
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.
Imports · August 2026
origin
United Kingdom and Canada together supply 91% of it. Ecuador pays 10.0% duty; Canada 0.0%.
customs district
destination
entry
rate provision · imports
47.7% enters free of duty; duty collected equals 5.23% of total import value.