Tungsten sulfide (WS2)

Drug ingredient

CAS 12138-09-9

This drug ingredient has classified U.S. production volumes. EPA withholds the number as confidential business information.

US productionCBI

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

Import value, 2024$23M

Top sourceAustria 29%

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 283090 · basket

EPA reports by year

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

These shares come from HS customs code 283090, which covers 34 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).

AT 29%AustriaDE 17%GermanyGB 13%United KingdomCN 9%ChinaIN 8%India

Philippines
Mexico
Netherlands
Malaysia
Singapore

EPA-registered manufacturers (4)

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

Eurecat France Sas · FR France

Chs

Eurecat U.S., Incorporated

Phillips 66

Domestic parents -- activity not disclosed (7)

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

Ecovyst

Marathon Petroleum

Martinez Renewables

Par Hawaii Refining

Pdv Holding

Show all 7

Valero Energy

Wrb Refining

Why It Matters

Sectors

Core ChemicalsHealthEnergyMetals & Mining

Downstream Uses

Appears in 1 drug and cosmetic product listings (FDA).

•Tungsten Sulphuratum

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 5 sectors as 2 functional roles.

•Intermediate in OtherProcessing as a reactant
•Catalyst in Other (100%)Processing as a reactant
•Intermediate in Services (10%)Use—non-incorporative activities
•Catalyst in Petroleum Refineries (90%)Use—non-incorporative activities
•Catalyst in Not Known or Reasonably Ascertainable (100%)Use—non-incorporative activities
•Catalyst in All Other Chemical Product and Preparation Manufacturing (100%)Processing as a reactant

Chemical Identity

CAS12138-09-9

PubChem CID82938

DTXSIDDTXSID2065256

FormulaS2W

Mol. Weight248 g/mol

SMILESS=[W]=S

Data Sources

EPA CompTox (DSSTox) · DTXSID2065256Retrieved 2026-04-06
PubChem · compound 82938Retrieved 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

Tungsten sulfide (WS2) (CAS 12138-09-9) https://chemicalindependence.com/chemical/12138-09-9/ EPA CompTox (DSSTox): DTXSID2065256. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID2065256 PubChem: 82938. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/82938 EPA Chemical Data Reporting: 12138-09-9. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 12138-09-9. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 283090 for CAS 12138-09-9. Reporting year: 2024. https://usatrade.census.gov/