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HSChapter 28
U.S. imports of sodium dithionites and sulfoxylates (HS 283110) totaled $1.6M in April 2026, traded with 9 countries.
Importers of Sodium Dithionites and Sulfoxylates paid $245K in duties in April 2026 — an effective duty rate of 15% on $1.6M in dutiable value, based on actual customs collections rather than the published tariff schedule. Sodium Dithionites and Sulfoxylates imports of $1.6M in April 2026 ran 22% above the year-to-date monthly average of $1.3M.
Last updated: April 2026 dataSodium dithionite (also known as sodium hydrosulfite) and sodium formaldehyde sulfoxylate are powerful reducing agents central to textile bleaching, vat dyeing, and paper pulp processing. The US schedule separates sodium formaldehyde sulfoxylate (2831101000) from other sodium dithionites and sulfoxylates (2831105000), a distinction that matters for end-use documentation in the textile and printing industries. Germany and India are the leading suppliers, with China also a notable source — importers should monitor whether any Section 301 exposure applies to Chinese-origin shipments under this heading.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Yes — sodium dithionite and sodium hydrosulfite are the same compound (Na₂S₂O₄). The trade name does not affect classification; both names refer to the product covered under 2831105000 (or 2831101000 if it is the formaldehyde sulfoxylate form). Importers should ensure the commercial invoice and SDS use consistent chemical nomenclature to avoid CBP queries.
Sodium dithionite is moisture-sensitive and can self-heat when wet, classifying it as a hazardous material under DOT regulations. Importers must ensure proper packaging, labeling, and carrier documentation (e.g., SDS and proper shipping name) are in order before the shipment arrives at the US port.
| Country | Imports | Exports | Balance |
|---|---|---|---|
| GERMANY | $1.1M | -- | -$1.1M |
| INDIA | $251K | -- | -$251K |
| CANADA | $44K | $97K | +$53K |
| BELGIUM | $93K | -- | -$93K |
| KOREA, SOUTH | $84K | -- | -$84K |
Monthly import values over time
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HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 2831105000 | DITHIONITES AND SULFOXYLATES OF SODIUM, NESOI | $1.4M | 16.29% | $225K |
| 2831101000 | SODIUM FORMALDEHYDE SULFOXYLATE | $238K | 10.00% | $20K |
DITHIONITES AND SULFOXYLATES OF SODIUM, NESOI
SODIUM FORMALDEHYDE SULFOXYLATE
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2831105000 | DITHIONITES AND SULFOXYLATES OF SODIUM, NESOI | $139K |
| 2831101000 | SODIUM FORMALDEHYDE SULFOXYLATE | $58K |
DITHIONITES AND SULFOXYLATES OF SODIUM, NESOI
30.2K kg
SODIUM FORMALDEHYDE SULFOXYLATE
60.5K 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 |
|---|---|---|---|
| Illinois | $456K | -- | -$456K |
| North Carolina | $430K | -- | -$430K |
| South Carolina | $159K | $58K | -$100K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| CHARLESTON, SC | $489K | $13K | -$475K |
| NORFOLK-NEWPORT NEWS, VA | $270K | -- | -$270K |
| PHILADELPHIA, PA | $221K | -- | -$221K |