Carbamothioic acid, ethyl-, O-(1-methylethyl) ester

CAS 141-98-0

U.S. production volumes are classified 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$25M

Top sourceChina 40%

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 293020 · basket

EPA reports by year

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

These shares come from HS customs code 293020, which covers 37 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).

CN 40%ChinaHU 16%HungaryJP 15%JapanIN 15%IndiaIT 6%Italy

Canada
Netherlands
United Kingdom
Israel

EPA-registered manufacturers (1)

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

Nalco- An Ecolab

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.

Quadra Chemicals

EPA-registered importers (4)

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

Clariant International · CH Switzerland

Syensqo Sa · BE Belgium

Clariant

Solvay

Why It Matters

Sectors

Metals & MiningCore Chemicals

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 2 sectors as 2 functional roles.

•Intermediate in All Other Chemical Product and Preparation Manufacturing (100%)Processing as a reactant
•Flotation agent in Mining (except Oil and Gas) and support activities (100%)Use—non-incorporative activities

Vendor Pricing

$0.09/gA2B Chem LLC (2 weeks)

CountryUnited States

Pack$430.00 / 5 kg

Purity95%

Vendors4 available

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

3 more vendors

Vendor	Country	$/g	Pack	Purity
AA BLOCKS (2 weeks)	United States	$0.09	5 kg	95%
Angene Chemical	China → Hong Kong	$0.16	500 g	95%
Aaron Chemicals LLC	Hong Kong	$0.22	500 g	95%

Chemical Identity

CAS141-98-0

PubChem CID3032295

DTXSIDDTXSID7027093

FormulaC6H13NOS

Mol. Weight147.24 g/mol

SMILESCCNC(=S)OC(C)C

Data Sources

EPA CompTox (DSSTox) · DTXSID7027093Retrieved 2026-04-06
PubChem · compound 3032295Retrieved 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

Carbamothioic acid, ethyl-, O-(1-methylethyl) ester (CAS 141-98-0) https://chemicalindependence.com/chemical/141-98-0/ EPA CompTox (DSSTox): DTXSID7027093. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID7027093 PubChem: 3032295. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/3032295 EPA Chemical Data Reporting: 141-98-0. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 141-98-0. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 293020 for CAS 141-98-0. Reporting year: 2024. https://usatrade.census.gov/