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HSChapter 28
U.S. imports of sodium tripolyphosphate (sodium triphosphate) (HS 283531) totaled $8.0M in April 2026, traded with 13 countries.
Importers of Sodium Tripolyphosphate (Sodium Triphosphate) paid $542K in duties in April 2026 — an effective duty rate of 21% on $2.6M in dutiable value, based on actual customs collections rather than the published tariff schedule. Sodium Tripolyphosphate (Sodium Triphosphate) imports of $8.0M in April 2026 ran 31% above the year-to-date monthly average of $6.1M.
Last updated: April 2026 dataSodium tripolyphosphate (STPP) is a high-volume industrial chemical used primarily as a builder in detergents, a moisture-retention agent in seafood and meat processing, and a dispersant in ceramics — making it one of the more commercially versatile phosphate salts in trade. Canada leads US import supply under this heading, with Belgium and China also significant sources. Imports from China may be subject to Section 301 tariff measures, a factor that has influenced sourcing decisions toward Canadian and European suppliers. Food-contact and food-processing applications are subject to FDA admissibility review; consult a licensed customs broker or FDA-registered agent regarding grade-specific compliance requirements.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
STPP is applied to shrimp, scallops, and other seafood to retain moisture during freezing and thawing. When imported as a food-processing ingredient, it is subject to FDA review as a food additive. Importers should ensure the product meets FDA purity specifications and that the intended food-contact use is clearly declared on entry documentation. Classification and admissibility are complex; consult a licensed customs broker or FDA-registered agent before shipment.
Chinese-origin STPP is subject to Section 301 tariffs, which has made Canadian and Belgian supply more cost-competitive for US buyers. Canada's proximity and established chemical production capacity have reinforced its position as the leading supplier. Importers should verify the current Section 301 status and applicable duty treatment for their specific product with a licensed customs broker, as rates and product coverage can change.
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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 |
|---|---|---|---|---|
| 2835310000 | SODIUM TRIPHOSPHATES (SODIUM TRIPOLYPHOSPHATE) | $8.0M | 21.04% | $542K |
SODIUM TRIPHOSPHATES (SODIUM TRIPOLYPHOSPHATE)
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2835310000 | SODIUM TRIPHOSPHATES (SODIUM TRIPOLYPHOSPHATE) | $737K |
SODIUM TRIPHOSPHATES (SODIUM TRIPOLYPHOSPHATE)
443.9K kg
URANIUM ENRICHED IN U235 ETC. PLUTONIUM ETC.
HS 284420
NATURAL URANIUM & COMPOUNDS, ALLOYS & CERAMICS ETC
HS 284410
ANHYDROUS AMMONIA
HS 281410
ALLOYS, DISPERSIONS,ISOTOPES & COMPOUNDS NES
HS 284443
SILICON, UNDER 99.99% (BY WEIGHT) SILICON
HS 280469
PHOSPHORIC ACID AND POLYPHOSPHORIC ACIDS
HS 280920
| Port | Imports | Exports | Balance |
|---|---|---|---|
| PORT HURON, MI | $3.8M | $148K | -$3.7M |
| DETROIT, MI | $1.2M | -- | -$1.2M |
| SAVANNAH, GA | $943K | -- | -$943K |