tert-Butyl mercaptan

CAS 75-66-1

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$760M

Top sourceChina 33%

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 293090 · basket

EPA reports by year

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

These shares come from HS customs code 293090, which covers 418 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 33%ChinaES 14%SpainCH 9%SwitzerlandIT 7%ItalyIN 7%India

Israel
Croatia
Ukraine
Slovakia
United Arab Emirates
Ireland
Poland
Lithuania
Brazil
Singapore
Australia
Armenia
Hong Kong
Vietnam
Czech Republic
Hungary
Greece
Russia

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.

Chevron Phillips Chemical

EPA-registered importers (1)

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

Arkema

Why It Matters

Sectors

AgricultureWaterCore 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 Pesticide, Fertilizer, and Other Agricultural Chemical Manufacturing (10%)Processing—incorporation into formulation, mixture, or reaction product
•Fragrance in Utilities (100%)Processing—incorporation into formulation, mixture, or reaction product

Vendor Pricing

$0.66/gFluorochem UK

CountryUnited Kingdom

Pack$65.78 / 100 g

Purity95%

Vendors7 available

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

6 more vendors

Vendor	Country	$/g	Pack	Purity
AstaTech, Inc	United States	$0.75	100 g	95%
A2B Chem LLC (1 week)	United States	$1.32	100 g	99%
AA BLOCKS (1 week)	United States	$2.32	100 g	99%
Labotest KG	Germany	$217.80	5000 mg	90%
Otava, Ltd.	Ukraine	$2280.00	50 mg	95%
Otava, Ltd. (2 weeks)	Ukraine	$2724.00	50 mg	95%

Chemical Identity

CAS75-66-1

PubChem CID6387

DTXSIDDTXSID0026418

FormulaC4H10S

Mol. Weight90.19 g/mol

SMILESCC(C)(C)S

Data Sources

EPA CompTox (DSSTox) · DTXSID0026418Retrieved 2026-04-06
PubChem · compound 6387Retrieved 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

tert-Butyl mercaptan (CAS 75-66-1) https://chemicalindependence.com/chemical/75-66-1/ EPA CompTox (DSSTox): DTXSID0026418. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID0026418 PubChem: 6387. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/6387 EPA Chemical Data Reporting: 75-66-1. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 75-66-1. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 293090 for CAS 75-66-1. Reporting year: 2024. https://usatrade.census.gov/