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5-Chloro-2-methyl-2H-isothiazol-3-one hydrochloride

CAS 26530-03-0

3(2H)-Isothiazolone, 5-chloro-2-methyl-, hydrochloride (1:1)

Molecular structure of 26530-03-0
1 HCl
US productionNot reported
Import value, 2024$447M
Top sourceChina 31%

This chemical is listed as active in US commerce, but no company reported it to EPA’s survey for 2019 or 2023. Sites may have made or imported less than the threshold amount, or none.

Why supply is unknown

Production is reported production, not a complete census of factories. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 293410 · basket

These shares come from HS customs code 293410, which covers 83 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
CN 31%ChinaDE 25%GermanyMX 19%MexicoJP 13%JapanIN 5%India

Why It Matters

No EPA sector or FDA product records name a use for this chemical.

Chemical Identity

CAS26530-03-0
PubChem CIDNot recorded
DTXSIDDTXSID5067219
FormulaC4H5Cl2NOS
Mol. Weight186.05 g/mol
SMILESCl.CN1SC(Cl)=CC1=O

Data Sources

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Brief citations

5-Chloro-2-methyl-2H-isothiazol-3-one hydrochloride (CAS 26530-03-0) https://chemicalindependence.com/chemical/26530-03-0/ EPA TSCA Inventory: CAS 26530-03-0. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 293410 for CAS 26530-03-0. Reporting year: 2024. https://usatrade.census.gov/