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Harmonized System
U.S. exports of thiosulfates (HS 283230) totaled $1.8M in July 2026.
Importers of Thiosulfates paid $64K in duties in July 2026 — an effective duty rate of 25% on $261K in dutiable value, based on actual customs collections rather than the published tariff schedule. Thiosulfates imports of $261K in July 2026 ran 28% above the year-to-date monthly average of $204K.
Last updated: July 2026 dataSodium thiosulfate — the photographic 'hypo' fixer and a medical antidote for cyanide poisoning — is the commercially dominant product in this heading, now separately enumerated under 2832301000, with other thiosulfate salts captured in 2832305000. Vietnam and China together account for the bulk of US imports, making this heading one where supply-chain concentration in Southeast and East Asia is a practical sourcing consideration. The heading also covers ammonium thiosulfate, widely used as a liquid fertilizer and gold leaching agent.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
29 shipments/mo
Ammonium thiosulfate in its chemical form (not formulated as a fertilizer mixture) is classified under the thiosulfates heading (283230) rather than under fertilizer headings. If it is imported as part of a formulated fertilizer blend, classification may shift depending on the composition. A licensed customs broker should review the product specification and intended use before filing.
A certificate of analysis or SDS identifying the compound by chemical name and CAS number is the standard supporting document. CBP may request this to confirm whether the product is sodium thiosulfate specifically or another thiosulfate salt, particularly when the commercial invoice uses a generic trade name.
HSChapter 28
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Subheading 3 of 3 in heading 2832
Subheading 283230 · $261K of $3.3M
ImportsExports
Imports
$261KYoY · Pro
Exports
$1.8MYoY · 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 |
|---|---|---|---|---|---|
| 2832301000 | Sodium Thiosulfate | $257K | 24.74% | 100.00% | $64K |
| 2832305000 | Thiosulfates, Except Sodium Thiosulfate, NESOI | $4K | 12.51% | 100.00% | $478 |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2832300000 | Thiosulfates | $1.8M |
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.
Exports · July 2026
destination
Mexico and Canada together take 87% of it.
customs district
origin
entry
rate provision · imports
the effective duty rate is 24.56%.