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HSChapter 31
U.S. imports of double salts & mixtures of ammonium sulfate (nesoi) (HS 310229) totaled $10K in April 2026, traded with 3 countries.
Double Salts & Mixtures of Ammonium Sulfate (NESOI) imports of $10K in April 2026 ran 82% below the year-to-date monthly average of $58K.
Last updated: April 2026 dataFertilizer products that combine ammonium sulfate with other salts or carriers — but do not fit the pure ammonium sulfate heading — fall under 3102290000 as double salts and mixtures not elsewhere specified. Germany and the Netherlands are the leading US suppliers, reflecting Europe's advanced specialty-fertilizer manufacturing base. These blended or co-crystallized products are often formulated to improve handling characteristics or nutrient release profiles compared with straight ammonium sulfate. Correct classification hinges on whether the product is a true double salt (co-crystallized) versus a mechanical mixture, a distinction customs examiners may scrutinize.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
A double salt is a chemically distinct compound formed by co-crystallization of two salts (e.g., ammonium magnesium sulfate), while a mixture is a physical blend of separate components. Customs authorities may request laboratory analysis or a certificate of composition to confirm which category applies, as the distinction affects the correct 10-digit classification.
Both countries host large integrated chemical and fertilizer complexes with the technical capacity to produce co-crystallized double salts and precision-blended fertilizer products. Their proximity to major European ports also supports cost-competitive bulk ocean freight to US Gulf and East Coast terminals.
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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 % |
|---|---|---|---|
| 3102290000 | DOUBLE SALTS & MIXTURES OF AMMONIUM SULFATE, NESOI | $10K | -- |
DOUBLE SALTS & MIXTURES OF AMMONIUM SULFATE, NESOI
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3102290000 | DOUBLE SALTS & MIXTURES OF AMMONIUM SULFATE, NESOI | $175K |
DOUBLE SALTS & MIXTURES OF AMMONIUM SULFATE, NESOI
58 t
| State | Imports | Exports | Balance |
|---|---|---|---|
| Florida | -- | $158K | +$158K |
| Idaho | -- | $17K | +$17K |
| California | $10K | -- | -$10K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| MIAMI, FL | -- | $158K | +$158K |
| SWEETGRASS, MT | -- | $17K | +$17K |
| DETROIT, MI | $10K | -- | -$10K |