Description HICIDECMI/MI-14 microbicide is an aqueous based preservative formulated with a long history of successful use in this application due to its reliability and excellent cost performance. Active Ingredients 5-chloro-2-methyl-4isothiazolin-3-one(CAS NO.26172-55-4) and 2-methyl-4-isothiazolin-3- one (CAS NO.2682-20-4)."