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HSChapter 28
U.S. imports of solid sodium hydroxide (caustic soda) (HS 281511) totaled $2.4M in April 2026, traded with 14 countries.
Importers of Solid Sodium Hydroxide (Caustic Soda) paid $238K in duties in April 2026 — an effective duty rate of 10% on $2.3M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 2026 dataSolid caustic soda — produced as flakes, pellets, or prills by evaporating chlor-alkali electrolysis liquor — is a foundational industrial alkali used in pulp and paper bleaching, alumina refining, and soap manufacturing. The US tariff schedule captures all solid forms under a single line (2815110000), making physical form (flake vs. pearl vs. micropearl) a commercial rather than a classification distinction. Sweden leads US imports under this heading, an unusual sourcing pattern that reflects Scandinavian chlor-alkali capacity tied to the region's large pulp and paper industry.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Solid sodium hydroxide (281511) and aqueous sodium hydroxide solution (281512) are classified under separate HS headings. Solid forms offer higher NaOH content per shipment weight and lower freight cost per unit of alkali, but require moisture-controlled packaging and specialized unloading equipment, whereas solution is pumped directly into storage tanks.
Importers should verify current antidumping and countervailing duty orders with CBP and the International Trade Commission, as caustic soda has historically been subject to trade remedy proceedings from certain origins. The applicable measures and scope can change; a licensed customs broker or trade attorney can confirm current order status before shipment.
Monthly import values over time
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| Country | Imports | Exports | Balance |
|---|---|---|---|
| THAILAND | $842K | -- | -$842K |
| TAIWAN | $538K | $7K | -$530K |
| SWEDEN | $538K | -- | -$538K |
| CANADA | -- | $347K | +$347K |
| KOREA, SOUTH | -- | $273K | +$273K |
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 2815110000 | SOLID SODIUM HYDROXIDE (CAUSTIC SODA) | $2.4M | 10.21% | $238K |
SOLID SODIUM HYDROXIDE (CAUSTIC SODA)
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2815110000 | SOLID SODIUM HYDROXIDE (CAUSTIC SODA) | $1.0M |
SOLID SODIUM HYDROXIDE (CAUSTIC SODA)
833.7K 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
| State | Imports | Exports | Balance |
|---|---|---|---|
| Pennsylvania | $1.1M | $3K | -$1.1M |
| Kentucky | $570K | $279K | -$292K |
| Texas | $260K | $175K | -$86K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| NORFOLK-NEWPORT NEWS, VA | $666K | $63K | -$603K |
| HOUSTON, TX | $433K | $138K | -$294K |
| SAVANNAH, GA | $374K | $35K | -$339K |