kathon

Kathon is a brand name used for a family of broad-spectrum biocidal preservatives, primarily based on a mixture of chloromethylisothiazolinone (CMIT) and methylisothiazolinone (MIT). The formulation is designed to inhibit bacterial, fungal, and algal growth in water-based formulations, helping to extend shelf life and prevent microbial problems during storage and use.

Applications include cosmetics and personal care products such as shampoos, lotions, and wet wipes, as well as household cleaners, paints and coatings, and metalworking fluids. Kathon formulations are commonly sold as concentrates or premixed solutions and are used in both consumer products and industrial formulations. Variants such as Kathon CG and Kathon MW refer to specific compositions and packaging designed for particular end uses.

Safety and regulation: MIT and CMIT are effective preservatives but are known allergens and can cause skin irritation or allergic contact dermatitis in some individuals. In the European Union and other jurisdictions, use levels in cosmetics have been restricted or banned for certain product types, with additional limitations for rinse-off versus leave-on applications. Many manufacturers have reformulated to reduce or eliminate these isothiazolinones. Users should follow product labels and local regulatory guidelines.

Environmental considerations and handling: as water-soluble biocides, CMIT and MIT can enter wastewater systems; proper handling, dilution, and disposal are required in accordance with local environmental regulations and safety data sheets.

History and ownership: Kathon originated as a trade name for isothiazolinone-based preservatives developed for industrial and consumer products and has been produced by multiple manufacturers under license, with changes in formulations reflecting evolving regulatory landscapes.