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HSChapter 31
U.S. imports of superphosphates — high-grade (35% or more p₂o₅) (HS 310311) totaled $22.3M in April 2026, traded with 4 countries.
Superphosphates — High-Grade (35% or More P₂O₅) imports of $22.3M in April 2026 ran 27% above the year-to-date monthly average of $17.6M.
Last updated: April 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.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
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.
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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 |
|---|---|---|---|---|
| 3103110000 | SUPERPHOSPHATES WGHT 35% OR MORE PHOSP PENTOXIDE | $22.3M | 9.99% | $293 |
SUPERPHOSPHATES WGHT 35% OR MORE PHOSP PENTOXIDE
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3103110000 | SUPERPHOSPHATES WGHT 35% OR MORE PHOSP PENTOXIDE | $0 |
SUPERPHOSPHATES WGHT 35% OR MORE PHOSP PENTOXIDE
| State | Imports | Exports | Balance |
|---|---|---|---|
| Arkansas | $9.3M | -- | -$9.3M |
| Louisiana | $7.9M | -- | -$7.9M |
| North Carolina | $2.8M | -- | -$2.8M |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| NEW ORLEANS, LA | $19.5M | -- | -$19.5M |
| WILMINGTON, NC | $2.8M | -- | -$2.8M |
| DETROIT, MI | $8K | -- | -$8K |