Ammonium thiosulfate

CAS 7783-18-8

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

Molecular structure of 7783-18-8 — 2 NH₄⁺

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 (16)

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

Tessenderlo Groip Nv/Sa · BE Belgium

Tessenderlo Group Nv/Sa · BE Belgium

Chs

Delek Us Holdings

East Penn Manufacturing

Show all 16

Flint Hills Resources Pine Bend

Hawkins

Hydrite Chemical

Jupiter Sulphur

Martin Resource Management

Par Pacific Holdings

Pci Nitrogen

Pvs Chemical Solutions

Tessenderlo Kerley

Tessenderlo Kerley, Inc. - Eufaula Facility

Thatcher

Domestic parents -- activity not disclosed (2)

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

Koch Industries

Nachurs Alpine Solutions

EPA-registered importers (3)

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

Marubeni · JP Japan

Agfa

Macrosource

Why It Matters

Sectors

AgricultureEnergyWaterMetals & MiningConsumer Products

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

Used in 7 sectors as 6 functional roles.

•Soil amendments (fertilizers) in Pesticide, Fertilizer, and Other Agricultural Chemical Manufacturing (100%)Processing—repackaging
•Soil amendments (fertilizers) in Wholesale and Retail Trade (100%)Processing—repackaging
•Photosensitive agent in Photographic Film, Paper, Plate, and Chemical Manufacturing (6%)Processing—incorporation into formulation, mixture, or reaction product
•Soil amendments (fertilizers) in Agriculture, Forestry, Fishing and Hunting (93%)Processing—incorporation into formulation, mixture, or reaction product
•Solids separation (precipitating) agent, not otherwise specified in Mining (except Oil and Gas) and support activities (60%)Processing as a reactant
•Anti-adhesive/cohesive in Oil and Gas Drilling, Extraction, and Support activities (5%)Use—non-incorporative activities
•Bleaching agent in Utilities (1%)Use—non-incorporative activities
•Dusting agent in Mining (except Oil and Gas) and support activities (18%)Use—non-incorporative activities

Vendor Pricing

$0.08/gSigma-Aldrich (Rush Stock)

CountryGermany

Pack$208.82 / 2.5 kg

Purity98%

Vendors5 available

Prices reflect listed pack sizes. Small research packs run far above bulk rates.

4 more vendors

Vendor	Country	$/g	Pack	Purity
Sigma-Aldrich	Germany	$0.08	2.5 kg	98%
Combi-Blocks, Inc.	United States	$0.30	500 g	96%
AK Scientific Specialized	United States	$0.51	100 g	95%
AK Scientific, Inc.	United States	$0.71	100 g	98%

Chemical Identity

CAS7783-18-8

PubChem CID6096946

DTXSIDDTXSID6029703

FormulaH8N2O3S2

Mol. Weight148.21 g/mol

SMILES[NH4+].[NH4+].[O-]S(=O)(=S)[O-]

Data Sources

EPA CompTox (DSSTox) · DTXSID6029703Retrieved 2026-04-06
PubChem · compound 6096946Retrieved 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

Ammonium thiosulfate (CAS 7783-18-8) https://chemicalindependence.com/chemical/7783-18-8/ EPA CompTox (DSSTox): DTXSID6029703. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID6029703 PubChem: 6096946. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/6096946 EPA Chemical Data Reporting: 7783-18-8. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 7783-18-8. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 283230 for CAS 7783-18-8. Reporting year: 2024. https://usatrade.census.gov/