Potassium thiosulfate

CAS 10294-66-3

U.S. production volumes are classified as confidential business information.

Molecular structure of 10294-66-3 — 2 K⁺

US productionCBI

Confidential Business Information. The EPA withholds this volume because publishing it could reveal the reporting company's trade secrets.

Import value, 2024$8M

Top sourceVietnam 77%

At least one company claimed its 2023 production or import volume for this chemical as confidential, so EPA withholds it.

Why supply is unknown

Production is reported production, not a complete census of factories. US production volume is confidential. Production reporting year: 2023. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 283230 · narrow

EPA reports by year

2023: US production Confidential · Imports Confidential
2019: US production Confidential · Imports Confidential

These shares come from HS customs code 283230, which covers 7 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries

Country of origin for US imports, from Census customs data (2024).

VN 77%VietnamCN 13%ChinaIN 4%IndiaDE 2%GermanyTW 1%Taiwan

Australia
Switzerland
Norway
Italy

EPA-registered manufacturers (5)

Companies that report making or importing this chemical to the EPA. Registration is US-centric and does not indicate import origin.

Tessenderlo Group Nv/Sa · BE Belgium

Hawkins

Hydrite Chemical

Tessenderlo Kerley

Thatcher

Domestic parents -- activity not disclosed (1)

EPA records name a US company for this chemical but do not disclose whether the company made it here or imported it.

Pvs Chemical Solutions

Why It Matters

Sectors

Agriculture

Downstream UsesNot recorded

FDA Shortage Status

Whether any manufacturer currently reports this drug as in shortage on the FDA Drug Shortages database. "Active Shortage" means at least one presentation has status "current."

No FDA shortage records

Industrial Uses

•Soil amendments (fertilizers) in Pesticide, Fertilizer, and Other Agricultural Chemical Manufacturing (100%)Processing—repackaging

Chemical Identity

CAS10294-66-3

PubChem CID61501

DTXSIDDTXSID70893108

FormulaK2O3S2

Mol. Weight190.33 g/mol

SMILES[O-]S(=O)(=S)[O-].[K+].[K+]

Data Sources

EPA CompTox (DSSTox) · DTXSID70893108Retrieved 2026-04-06
PubChem · compound 61501Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
US Census international tradeReporting year: 2024 · Retrieved 2026-10-04

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Brief citations

Potassium thiosulfate (CAS 10294-66-3) https://chemicalindependence.com/chemical/10294-66-3/ EPA CompTox (DSSTox): DTXSID70893108. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID70893108 PubChem: 61501. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/61501 EPA Chemical Data Reporting: 10294-66-3. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 10294-66-3. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 283230 for CAS 10294-66-3. Reporting year: 2024. https://usatrade.census.gov/