2-Octyl-2H-isothiazol-3-one

2-Octyl-2H-isothiazol-3-one (CAS 26530-20-1, EC 247-761-7) is a sulfur-nitrogen heterocyclic biocide commonly identified by trade names including Kathon LP Preservative, Kathon 893, and Pancil-T, and by the abbreviation OIT. It carries no assigned E-code and is classified under HS code 29341000.

In metalworking fluids and cutting oils, OIT controls bacterial and fungal growth by disrupting cellular enzyme function, extending fluid service life. In architectural coatings and adhesives, it prevents in-can spoilage and dry-film degradation caused by microbial colonisation. It is also applied in leather and textile processing as a preservative during wet-stage manufacturing.

OIT is registered under REACH and available in neat liquid or solid form, as well as diluted formulations in carrier solvents suited to specific end-use compatibility requirements. Procurement quantities typically range from drum to IBC scale. Buyers should confirm SDS compliance with current EU CLP classification prior to formulation.