1,2-Benzisothiazolin-3-one

CAS 2634-33-5

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$104M

Top sourceChina 56%

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 293420 · basket

EPA reports by year

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

These shares come from HS customs code 293420, which covers 76 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 56%ChinaBE 33%BelgiumIN 4%IndiaIT 3%ItalyES 2%Spain

Japan
Canada
Ireland
Slovakia
Ukraine
United Kingdom
Taiwan
Germany
Netherlands
South Korea
Switzerland
Greece
Croatia

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.

Blue Tree Holdings

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 ManufacturingNot Known or Reasonably Ascertainable

Vendor Pricing

$0.14/gA2B Chem LLC

CountryUnited States

Pack$72.00 / 500 g

Purity98%

Vendors7 available

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

6 more vendors

Vendor	Country	$/g	Pack	Purity
AA BLOCKS	United States	$0.18	500 g	98%
Combi-Blocks, Inc.	United States	$0.25	1 kg	98%
AK Scientific Specialized	United States	$0.28	500 g	95%
AK Scientific, Inc.	United States	$1.64	100 g	99%
Sigma-Aldrich (Rush Stock)	Germany	$8.96	25 g	97%
Sigma-Aldrich	Germany	$8.96	25 g	97%

Chemical Identity

CAS2634-33-5

PubChem CID17520

DTXSIDDTXSID5032523

FormulaC7H5NOS

Mol. Weight151.19 g/mol

SMILESC1=CC=C2C(=C1)C(=O)NS2

Data Sources

EPA CompTox (DSSTox) · DTXSID5032523Retrieved 2026-04-06
PubChem · compound 17520Retrieved 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

← Back to Dashboard ← Back to Agriculture

Brief citations

1,2-Benzisothiazolin-3-one (CAS 2634-33-5) https://chemicalindependence.com/chemical/2634-33-5/ EPA CompTox (DSSTox): DTXSID5032523. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID5032523 PubChem: 17520. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/17520 EPA Chemical Data Reporting: 2634-33-5. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 2634-33-5. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 293420 for CAS 2634-33-5. Reporting year: 2024. https://usatrade.census.gov/