Benzisothiazolinone

Benzisothiazolinone, commonly abbreviated BIT, is an organic compound that belongs to the isothiazolinone family. It consists of a benzene ring fused to an isothiazolinone ring (1,2-benzisothiazolin-3-one). BIT is used primarily for its antimicrobial and preservative properties.

Applications include use as a preservative in various products such as cosmetics, personal care items, and household liquids; it is also employed as a biocide in paints, coatings, adhesives, and cooling water systems. In industrial formulations, BIT can be found in metalworking fluids and pulp-and-paper processing.

BIT exhibits biocidal activity against bacteria, fungi, and some algae. Typical use concentrations are low. The compound is a solid with limited water solubility but solubility in many organic solvents, and it can degrade in the environment under certain conditions.

Safety and regulatory status: BIT is a known skin and respiratory sensitizer and can provoke contact dermatitis in some individuals; appropriate handling and protective equipment are advised. Regulatory status varies by jurisdiction: many regulators restrict or require labeling of isothiazolinone-based preservatives due to allergenic potential. BIT is not approved as a food additive and is not intended for ingestion; consumers with isothiazolinone allergies should avoid products containing BIT.