U.S. imports of Sodium Dithionites and Sulfoxylates (HS 283110) totaled $1.6M in August 2026, imported from 11 countries.
Importers of Sodium Dithionites and Sulfoxylates paid $245K in duties in August 2026, an average duty rate of 15.41% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Sodium Dithionites and Sulfoxylates imports of $1.6M in August 2026 ran 28% above the year-to-date monthly average of $1.2M.
Last updated: August 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.
35 import shipments a month
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.
Trade Directory
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Subheading 1 of 2 in heading 2831
Subheading 283110 · $1.6M of $1.6M
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 2831105000 | Dithionites and Sulfoxylates of Sodium, NESOI | $1.1M | 18.49% | 100.00% | $199K |
| 2831101000 | Sodium Formaldehyde Sulfoxylate | $514K | 8.96% | 89.61% | $46K |
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 | $118K |
| 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.
ImportsExports
Imports
$1.6MYoY · free account
Exports
$122KYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $14.0M of Sodium Dithionites and Sulfoxylates and exported $1.4M.
Through August 2026. Source: U.S. Census Bureau.
Imports · August 2026
origin
India and Germany together supply 81% of it. China pays 43.0% duty; Canada 0.0%.
customs district
destination
entry
rate provision · imports
3.4% enters free of duty; duty collected equals 15.41% of imports for consumption.