U.S. imports of Superphosphates — High-Grade (35% or More P₂O₅) (HS 310311) totaled $46.9M in August 2026, imported from 8 countries.
Superphosphates — High-Grade (35% or More P₂O₅) imports of $46.9M in August 2026 ran 91% above the year-to-date monthly average of $24.6M.
Last updated: August 2026 dataHigh-grade superphosphates containing 35% or more phosphorus pentoxide (P₂O₅) by weight — a category that includes triple superphosphate (TSP) — are classified under 3103110000 and serve as a concentrated phosphate source in compound fertilizer blending and direct application. Israel is the leading US supplier under this heading, reflecting the country's large phosphate rock and processed fertilizer export industry, with Lebanon, Egypt, and Mexico also among the top sources. TSP's high nutrient density reduces freight cost per unit of phosphorus, making it competitive for long-haul trade despite the energy-intensive acidulation process required to produce it.
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3 import shipments a month
Single superphosphate typically contains 16–20% P₂O₅ and falls under heading 310319 (superphosphates NESOI), while triple superphosphate contains 44–48% P₂O₅ and meets the 35%-or-more threshold of heading 310311. The P₂O₅ content on the certificate of analysis is the determinative classification factor, and importers should ensure the supplier's documentation clearly states the guaranteed analysis.
The 35% P₂O₅ threshold separates two distinct HTS subheadings with potentially different duty rates. If a product's P₂O₅ content is near the threshold, a laboratory analysis certificate from an accredited testing facility should accompany the entry to substantiate the declared classification and avoid reclassification by CBP.
Subheading 1 of 3 in heading 3103
Subheading 310311 · $46.9M of $59.6M
Trade Directory
List your company under HS 310311 — Superphosphates — High-Grade (35% or More P₂O₅), so the companies trading it can find you. Be the first supplier listed.
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 |
|---|---|---|---|---|
| 3103110000 | Superphosphates Wght 35% or More Phosp Pentoxide | $46.9M | 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 |
|---|---|---|
| 3103110000 | Superphosphates Wght 35% or More Phosp Pentoxide | $4.9M |
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.
ImportsExports
Imports
$46.9MYoY · free account
Exports
$4.9MYoY · free account
Low of 9 reported months · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $244.4M of Superphosphates — High-Grade (35% or More P₂O₅).
Through August 2026 · imports 9 of 12 months reported, exports 5 of 12 months reported. Source: U.S. Census Bureau.
Imports · August 2026
origin
Morocco and Brazil 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.