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HSChapter 28
U.S. imports of sodium dithionites and sulfoxylates (HS 283110) totaled $1.3M in July 2026, traded with 10 countries.
Importers of Sodium Dithionites and Sulfoxylates paid $138K in duties in July 2026 — an effective duty rate of 13% on $1.0M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: July 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.
29 shipments/mo
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.
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Subheading 1 of 2 in heading 2831
Subheading 283110 · $1.3M of $1.3M
Imports · July 2026
origin
India and Germany together supply 79% of it.
customs district
destination
entry
rate provision · imports
18.5% enters free of duty; the effective duty rate is 10.99%.
ImportsExports
Imports
$1.3MYoY · Pro
Exports
$51KYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 2831105000 | Dithionites and Sulfoxylates of Sodium, NESOI | $840K | 14.17% | 100.00% | $119K |
| 2831101000 | Sodium Formaldehyde Sulfoxylate | $414K | 4.53% | 43.86% | $19K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2831105000 | Dithionites and Sulfoxylates of Sodium, NESOI | $47K |
| 2831101000 | Sodium Formaldehyde Sulfoxylate | $4K |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.